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Produced by the NASA Center for Aerospace Information (CASI) #Wtft r M041e under NASA sptonsorsf 1p In the interest of eaaly and wide dis- ., r Sem►natlon of Earth Resources Survey Program information aad without liability loran)► We nu'd'e ttweast

REMOTE SENSING OF GEOLOGIC MINERAL OCCURRENCES

FOR THE MINERAL BELT USING LANDSAT DATA

(E77-10176)- REMOTE SENSING OF GEOLOGIC N77--27466 MINERAL OCCUREENCES FOR THE USING LANDSAT DATA Final Repvst, 1 Jul. 1975 -- 30 Sep. 1976 (Colorado School of Qncla s Mines, Golden.) 161 p A08/MZ A01 CSCI, 086 G3/43 00176.

NASA Contract NAS5-20955

INVESTIGATORS:

Robert H. Carpenter David W. Trexler

Type III Report for Period l July 1975 - 30 September 1976

Prepared for NASA/GODDARD SPACE FLIGHT CENTER

Greenbelt, ,Maryland 20771 *F 1 Tecb wcel Met ac^taliaw Page S.rA. R . Z. ri.rNrmmam. Aeca..ra.r Me. ]. R r`. Gre1s Me.

A. TWO 411WLitil^! 3. R"Wo Oily Remote Sensing of Geo.16 is Mineral Occurrences for the Colorado Mineral Belt .. r^^..^MO1...... 1.Mc.+. using LANDSAT Data R. /rdrwiry Or^r...lr.rr Reps, tai. 7. a*r11^,.dN R obert Carpenter an David W. Trexler 1. Pen wwis Org.0in m w..e ei.i Aid,.... IQ. ww6 Ue.1 Me. (TRAIS) Colorado School of Mines Golden, Colorado 8040 11. I ),I, 1 NAS ~5^-M^20955 it T"M of Repo" .w.d P.r.00 cow..i ax *-mm " Avw cv Ita— as" AM—e Type III James C. Broderick 7/1/75 to 9/30/76 Landsat Technical Monitor NASA/Goddard. Space Flight Center , "• ^jae-11ing Amy QWw Grf?ahbel t Marmrl 29 1 1s. Upplo owrou" i4»,

T*. Al-wec+ The object oT this pro-rain was to determine Tne value o LANDSAT imagery as a practical and productive tool for mineral exploration along the Colorado Mineral Belt. An attempt was mad to identify all large, active and/or abandoned mining districts on the imagery which initially were discovered by surface manifestations. A number of strong photolinements,'circular features and color anomalies were identified. Some of these form a part of the structural and igneous-volcanic framework in which mineral deposits occur. No specific mineral deposits such as-veins or porphyries were identified.. Promising linear and concentric features were field checked at several locations. Some proved to be.fault zones and calderas; others were strictly topographic features related to stream or glacial entrenchment. The Silverton Caldera region and the Idaho Springs-Central City P q^ district were chosen and studied as "case histories" to evaluate. the application of LANDSAT imagery to mineral exploration.. j Evidence of specific mineralization related to ore deposits in 4 ^^ these two areas were observed only on low level photography. F a

i7. R^r ^rt^ ti. ^isriirti^ SIi.Nw.nf mineral deposits surface manifestations geomorphic expression a photolinements

1 21. 19. Gsm.U: (.i r`:. oiti) M+. Of PT Pi.ci c.x.^ N" TABLE OF CONTENT S

Page INTRODUCTION ...... ,...... 2 DESCRIPTION OF THE COLORADO MINERAL BELT ...... 4 LINEAR STUDY ...... 8

THE SILVERTON CAMERA -- A CASE HISTORY ...... 21 L ^ THE IDAHO SPRINGS-CENTRAL CITY AREA - A CASE HISTORY .... 25

CONCLUSIONS ...... 28

APPENDIX A (Tables I, II, III)

APPENDIX B

^i

l

1 1

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^yyd V 1

yy 9._r aS

s:

L

1

:.:..s +a... x.....si :.1„ #4TT^-...,..^...r... _. ._ _.,...:..2 ,.._.,..yleax.I1e...ilfa'.+eru^. ._iet^..^d^ -' ,^.C:^^i.' .u^..n..^k^ va,tia.,'^;at^..e y ^-^._.- ^ .-^....>_ • _. _ --. _. - _ _ I Ll

LIST OF ILLUSTRATIOriS

Plate Page

1 Topolinears 29

2 Topolinears and mineral occurrences and mining districts 30

I U- 3 Structure of the 5ilverton Caldera and adjacent areas 3.1 . (.Burbank, Pl ate 1, pp. 535) U 4 Geologic sketch map of (Tweto & Sims, GSA Bull.., Aug. 1964) 32 I U .. Figure ..l Index map of the . Colorado Mineral Bela LI (Tweto & Sims, GSA Boll Aug. 1964) 3 2 Location of principal mountain ranges and the mineral belt (Tweto &.Sims, GSA Bull.., Aug. 1964) 5

3 Explanation of symbols used on Plates 1 & 2 and Figures 4 through 11 9 ^I 4 Mining districts: (1) Jamestown-Gold Hill, (2) Fig. 4 to 11 10

5 Mining districts: (4) Montezuma-Breckenridge, (5) Kokomo- Cl imax-Leadvi 11e 11

6 Mining districts: (6) Battle Mountain (Red Cliff-Gilman), (7) Homestake, (8) Independence 12

7 Mining districts: (9) Aspen-Ashcroft-Snowmass, (10) Marble, (11) 'Taylor River 13

.8 Mining districts: (12) Winfield, (1.3) Cottonwood, (14) Tincup, (15) Pitkin-Ohio City, (16) St. Elmo-Chalk Creek, (17) Garfield- I - 14_ -f ^ Monarch

9 Area south of Gunnison 15

10 Mining district: Creede _ 16

11 Mining di=stricts: (19) Lake City-Ouray S'i l verton-Tel l uri'.de, (20)- Rico 17

E 1 12 Calderas-of the: San Juan Volcani c Field(.Stev.eos, pp, 938a 22

13 Vein systems of the Central City-Idaho Springs area (Lovering, pp. 223) 26

F G '.'.^E

".1 .. i_ .. ___ ^ -•-ai1Y111Y'lM1lWill CY f^dw^^ .. .-_ .,- Y^^

Ll

INTRODUCTION

^I ---1 , A contract was signed between the National Aeronautical and Space

Administration and the University of Utah on March 31, 1975, under which

the University agreed to evaluate the application of LANDSAT imagery to

mineral exploration in the Nevada-Utah Mineral Belt and the Colorado Mineral

Belt. The Colorado School of Mines subsequently was granted a sub-contract.

to assume the responsibility of the Colorado Mineral Belt investigations.

These studies were started .July 1, 1975.

The specific objective of this study was to establish methods and cri-

teria for using LANDSAT multi-spectral scanner imagery as a practical and

productive tool for mineral exploration along the Colorado Mineral Belt,

The Colorado Mineral Belt includes a northeast-southwest zone of major

Precambrian and Tertiary shearing and intrusive activity. It extends from

the Jamestown mineral district on the northeast to.the Rico district on

the southwest, a distance of approximately 300 miles. It ranges from 20

to 50 miles in width and includes most of the mining distric ts of the

State (see fig. 1).

The first step in the program was a detailed literature search to estab-

lish a comprehensive bibliography of the Mineral Belt. References by min - ,

era] districts and by counties are given in Appendix A. This was accompan-

ied by a study of LANDSAT multi-spectral scanner imagery, the scale of

ly. which is 1/1,000,000. No U-2 photography was available. Low level black

and white photos of the Silverton Caldera area and the Idaho Springs-Central

^-^ City district also were evaluated in conjuncti on with "case history" studies

of these two areas.

T P 7

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: a i DESCRIPTION OF THE COLORADO MINERAL BELT. I U

Introduction.

The Colorado Mineral Belt is a tectonic zone which formed initially

in Precambrian time and which was rejuvenated during the .

Most all of the major metallic mineral deposits of Colorado occur within

this zone. It extends diagonally across the State from Jamestown on the ^• northeast to Rico on the southwest, a distance of over 300 miles. The width of the Belt varies from 20 to 50 miles (figs. -I and 2)..

Geologic Backdrop

Precambrian metamorphic rocks and granites constitute the country in rocks the northeast, central and locally in the southwest where the belt

crosses the deeply eroded portion of the , the and

the San Juan uplift. Mesozoic sedimentary rocks occur in the Middle Park

region between the Front and Sawatch Ranges, whereas Paleozoic and Mesozoic

sediments with a'thick cover of Tertiary volcanics predominate in the San

Juan uplift. (fig. 2).

Laramide and mid-Tertiary igneous activity consisting of dikes, sills,

stocks and batholiths of intermediate to acidic composition occur along the

Colorado Mineral Belt, reflecting mobilization of deeply buried crustal

Ll rocks in the root Zone of the.Belt.

In the central and northern part of the Mineral Belt tectonism is reflec- U ted by ( a) . a . strong northeast arcuate trend in the . Precambrian metamorphics and granites which probably formed when the crust was thin and somewhat

mobile, by. ( b) .. northwest-trending faultsincluding breccia.reef.9; they ar e

^parallel . to the northwest trending portions of the individual mountain artso

too l fol0 - 106a 109° 104° --..:..:.^^ IW G _^— 41! :o n 1 b Walden' Rl^er E Sterling NORTH u . YOmPO Craig Ricer x PARK. m 73 aA ^ Q`p^1a I f j Q

MIDDLE Z — sO^/q 1

- K _ ^ 6uldtr WHITE 40° I - 40°.1 Q e RIVER 'A c 1 41 UPLIFT DEN ER G enwood,Sfill "^ rU^ ulli C 0. 1P/ol l I ` ^ p1y^R 4 .-^ f 1 t ll1 °n -' o. 3 f Qo v' ^4l H16 LAINS (Ix .. .. _ ^v dvlll ^ rp Burling on O , ps La r E L . SOUTH p Grand 4^° P en_p 39° Juri[tian AMTS :'a ARK 139° t + A S V° Colorado Springs i yCa EST T e C Rio ELK'. y. I 4p .4,y MTS C - 4G 'P 'Gunnison *Canon Cily l^ Fire NO

4 ^ ^^,, ^f ,4rkarrs¢s R'^er ,

z Il . -- _-rA:N JUAN ^Creede (G ^^ 1 Rio 1 ua - } Needle '1 -MIS - o i l 9 Sao 1 ( MUUNTAIN$ 11y 1 P1°I°^Ul. )JJ ^ ^^ 0 25 50 ?5 !00 Ssalr in milen + i - - llurunga a 2 on Luis rn • Trinidad.

104 loe° 107° 106° l05°

I^igurc I. I,.ocaliuu ref' principal muul3lain ranges alul millelal bcil in ('wllorrdlr ^ '

l _ u S by W north-northeast trending faults; these faults are essentially

parallel to the Precambrian foliation trends, and by (d) east-northeast

faults; they developed in the arcuate junctions where major foliation direc-

tion reversed trend very rapidly (Plate 4). These fault systems are Ll believed to have developed as thrusts or high angle reverse faults in the Precambrian and were reactivated during the Laramide and Tertiary in part

' as strike slip faults resulting from east-west directed stresses (Plate 4).

Low angle, northerly-trending thrust faults were active along the flanks

of the Front Range and Sawatch Range as these arches developed during the Ll early Tertiary. In the southwestern part of the Mineral Belt deep-seated shearing

related to failure within and along the flanks of the northwest-southeast

" trending Uncompahgre positive structural block appears to have been respon-

sible for the mobilization of the crust and the subsequent expulsion of

large volumes of intermediate to acidic volcanics and the emplacement of

numerous underlying batholiths and stocks in the volcanic field. Failure

over the crest of a number of the intrusives has resulted in the caldera

features of this extensive volcanic pile which occupies approximately 25,000

No. There is a strong relationship in space and time during the.Laramide

and Tertiary between tectonic fabric along the Mineral Belt and igneous

activity and mineralization. Deep rooted channelways are believed to have

developed at the corners of we dge- shaped Hocks i n the northern p a rt of the

' Mineral Belt (Plate 4). Molybdenum porphyry intrusions such as the Drad- - ^ Henderson. are located at sharp charges in trend i n the foliati on of the

Precambrian rocks and with associated faulting (Plate 4). -Mineral ization

in the San Juan volcanic field is clearly associated with late stage failure

within and between the caldera centers (Plate 3).

LINEAR STUDY

u Because the location of mineral occurrences along the entire length

of the Colorado Mineral Belt is well documented an attempt was made by

Dr. Trexler to relate visible linears to mineral deposits.

Procedure

Topolinears were plotted on LANDSAT transparencies using a Bausch &

Lomb zoom stereoscope. Both LANDSAT 1 and 2 images of each scene which Ull contained any part of the area of interest were annotated. Table I lists the frames used in this study. The photolinears were transferred from all u images to photographic enlargements (1:500,000 approximate) with a transfer u scope and from the enlargements to AMS 2 0 topographic maps. A composite overlay was made at, 1:250,000 scale. This is shown in reduced form on u Plate l (scare 1:500,000 approximate). The locations of mineral occur-

rences were then plotted on the overlay (Plate 2). These.locations were U taken from USES Prof. Paper 138, Plate I.

Interpretation of Linears

With the exception of ring structures associated with the caldera of

the , no apparent relation.c.ould be seen between the

topolinears and mineral deposits.

The geologic significance of photolinears was studied . using all avail-

able geologic maps in order to detect any relation between linears and

mineral occurrences.: Figure 3 is an explanation of symbols used on maps

for identified topolinears.

Only 48, or about 0.05%, of the linea.rs.were.identified from the

Geologic Map of Colorado (scale 1:500,000). As would be expected, a much . r

L Fig. 3. Expanation of symbols used on Plates 3 & 2, Fig. 4 - 11 ^L

A

LI ! Faults and shear zones

Joint control

^f Dip control :t

Er, Foliation control

^.... Lithologic contact

d d Dike or vein system

IA Ring fracture of cauldera r Edge of volcanic flow

Glaciated valley i ^^

yy

------— Unidentified topolinear

4

.a L f

F^

s^

t ^ . , e 5 ml

05 km ^. ---.^ f _f d ^. X k h JAMESTOWN ^ d X t '^^ x x x x k d i xX y X ^ x X x ^ f -f Faults and shear zones xx k X X x x Joint control k i y' pip control )< d. —AL— Foliation control is Lithologic contact 1 X -.^ (i d—d pike or vain system —Q— f Ring fracture of cauldera 1 x d^^d`•— x x Edge of volcanic flow x xXX f Glaciated valley _ Unidentified topolmear I X Mineral deposit J. X f f^ f` L, d I f ^// f \f f d dX ^,. lf f X Xxx X x X X \f I f \ _ f X X , \^ f / ^ X O f 1 ff f ! / I X f^ d x f}1 _ x -- X x aT—' If BERTHOUD PA55/ ''' --^ .` ^( x ' BLACK HAWK x X, f ^f x CENTRAL CITY X d i X G x _ G X lx X X d I ` G f x X 1f 1x ^( }( Xx x X IDAHO SPRINGS xKXX X XX 0 3 X1 1 X X X f^^ X '_S G d^^ GEORGETOWNk x x r ^^ '^ x G )( f

f

^..Igure`4: Mining'. districts: 0) Janustown-Gold Hill, (2) Caribou-Nederland, (3) Black Hawk-Central City- Idaho Springs — Georgetown.

^i^

it

x 1 t ^^ x k ^ X x $ 0 DILLON / X $ .0 j

MONTEZUMA x C)( x --_^ FO SQO 1 ^ x - X x ^ X X\x XX D4. xx. ^o X / X^ X ' X X X X` x

x x!

X Ix BR' ECKENRI DGE _

f f XX Ll X d x^ xf . .X x\\^ f` ^.

^(\ x ' f f, Faults and shear zones LL^^ I _ r ` I .—. Joint control .Dip control ' 3 I Foliation control a I0 111 s f Lithologlecoritact III^^^!!! X f'^f ` f \ ~ \ \ d-d Dike or vein system

/ Jf X 1 . ^ -Ring - ofvolca flow ra - l x •`, Edge of volcanicc flaw

' \ f r x `^- rs Glaciated valley

/ 7 ^ w. •^ •-• Unidenlifledtopolinea[ x /^ ^ `I / )( Mineral deposit I k X x X _ - xX 1`f ^—O ALMA f\ f^ f N 1X IX ^ ^ I LEADVILLE O 1 Xx f X;x FAIRPLAY f^x X x X /\ \.^ °

X .

A. rz iu 13 jL

mi t a fi km c F

f ^^f Faults and shear zones Jolntcantrol dip control Z - flo f 14 ls' , ...... _ i ^'_. ',S ...... ,. ....

.:: _ _... _ '. _ - .. , ,. w .,^ :_.^. ,-.., ^,^1e^#::.^ T,^eerr^a eaee^lntrF^Fm.us ^

^^ } ^`'^`^; ! ^'. 4._^.^.+.+ ^^.l h...^.^ M.^«I ^ 4-L-«^- ^R ^ ,:sue W ^.^, ,;`;"Y 'R'^`. T1 ^1z'-"G^:! ^^'^ss'^?

V V U. higher percentage of li:nears'were identified i'rom.larger scaled. maps. As for example about 500 of the linears within the coverage of USGS 1:24,000

L -quadrangl e geologic.. maps could be identified (Table III). Because large-scale geologic map coverage is limited, field checking

was conducted in a number of areas of mineral occurrence in order to iden-

tify as many linears as possible and to see if these linears had any - direct relation to mineral deposits:. Figures 4 to 11 are large scale maps 4 (1,• 250,000) of the mineral districts with both identified and unidentified

linears shown. A brief discussion follows. :s Figure 4 of the northern end of the mineral belt shows a hi gh per-

centage of i`denti'fied linears. Most of these are north-northeast and

northwest Precambrian fractures. Northeast to east early Tertiary frac-

tures were also identified. The.northeast and east vein system at Central

City and Idaho Springs (Fig. 14) were not detected, nor were the early

Tertiary igneous stocks. Also the vein.system could not be detected on

1:60,000 airphotos.

Figure .5; the minerali zation at. the Montezuma. district (4) is asso-

ciated with an early Tertiary stock which could not be detected. The east-

west l inear coincides with .a known fault and parallels a strong. set of

east-west poi nts . The Kokomo., Climax, and Leadvi i.le distri cts (5).are

along the trend of the Mosquito fault. The numerous sills, dikes, and

stocks,,. which could not be detected,.control.the localization of ore min-

erals in Upper Paleozoic sediments. -

[. Figure .6; the mineralization at Red Cliff and Gilman. (6). is associated

with sills and dikes in Paleozoic sediments (Fig. 13). A northeast joint,

trend was identified.. Mineralization in the Homestake area. 7) :. it associated

with a northeast trending set of strong shear zones and parallel joints

op ^_..__,_. __..-.._- --..... ks. M.,,, .._.. 1• -:'.. -,v ..,...... L,.- ;1^TVcrscr:'u"L., t^k.^vtv:^^LSr^.^^r a-' .u:+'.:* 71:e. .a-„us„v. .ay m..,. ws.msdd,^+' ^:.Ld^Siu^srw ' --'.`5ade:.aaa:...a.:ew .,.sv. . a-_..,....,....-:.-.ur-.....r,...w.. U 1.9 .

(Fig, 13}. These were also identified. A shear zone associated with

r mineralization at Independence Pass (8) was not identified.

Figure 7`; a few north trending faults were the only linears annotated

in the vicinity of Aspen and Ashcroft (9). The Treasure Mountain uplift

(Early Tertiary) near Marble (10) was annotated as a conspicuous curvilin- ear. Mineralization along the upper Taylor River (11) seems to be related to a conspicuous northeast trending set of joints.

Figure 8 mineralization at Winfield (12), Cottonwood Pass (13), and

St. Elmo (16) .is associated with conspicuous north to north-northeast sets i of joints. At Pitkin and Ohio City (15) joint sets and a fault were

identified with northwest and northeast trends. On the southwest side of

the Garfield and Monarch districts (17) the dominant trend of foliation and Jointingnq s northeast.

Figure 9; the northern part of this area is an old erosional surface cut in Precambrian rocks on which can be detested numerous joint sets

except on some stream divides where Tow dipping Mesozoic sediments and

Tertiary. volcanics cap the older rocks.. The:curvilinear in the southeast corner is the Cochetopa caldera. The other curvil inears may also represent

older-ring structures associated cau (J ; with dera; Figure 10; he curvilinear south of the town of Creede is the Creede cauldera. Mineralization; however ., is to the north at (i8) where no topo-

'21

lu

THE SILVERTON CALDERA A CASE HISTORY

Introduction

The Sari Juan Mountains which Include the Silverton caldera, are located

in the southwestern part of the Colorado Mineral Belt. They constitute a

great,, composite volcanic field covering an area 100 miles by 150 miles in

which 18 cal:deras are known or are postulated' (fig. 12). The volcanic rocks

of this field consist of early stratovolcahos overlain by ash flow eruptions

,d .4 .4: .9. 7 011 P_VUU%. CL.3L. L.3. Ca eras WCVC superimpose as V Ua IllaylluQ, L,.WVWU

upward toward the sufface from an underlying regional batholith. This intru-

sive is identified by a sharp gravity low. The formation of the San Juan in volcanic fi'el'd extended: time from 35 m.ye to 20 m.y. but most of the Vol- s. canism occurred prior to 26 m.y.

Volcanic Sequence

A thickness:: of more than a mile of volcanic rocks rest on.a basement of Iig. 12

^. UN S_IL LC 1.G

rp > F S S 9^r 1 , I ^ L ig^ C '4^?rQ^ h O r U

Needle Tlilountaine 1 I !

^— ► M14 f a

.30 m K r 75'

.. . -; .. :

Sort Juan Basin b -$C

37° .

0 10 20 30 40 50 KILOMETRES

EXPLANATION .--MO- 9ouguar gravity contour --mm4ures Point CALOERAS (in order • Fault—Bar and 'baltan downthrown side toward clesed gravity lows. Contour of inpeatiflQ agel L, interval 10 rniliigalsL Gtmav data from LC Lake City CakieraPlouif and Pakisee 11972, fig. 3) C Creeds CP Cochetops Park _ t Buried or infee caldera %— SL San Luis LG La Garite Maunt4400e $. Silvww" OENVERo Si Sin Juan COLORADO L" Lake U Ute Crook San Juan SM SUmmrtville roleania NrW P Platon7' Bs Bonanse LOCATION OF SAN JUAN VOLCANIC FIELD

FICt:RE j.—Grldcm in the San Juan volcanic Field (pauemed) in .M26CM to Bougucr 'gravity field,. E

23

Silverton Caldera E The Silverton caldera, located on the western side of the San Juan

volcanic field serves as one of two case histories for this study. it is

about 10 miles in diameter and is situated within the western half of the

San Juan volcanic depression which is about 15 miles wide and 30 miles long

(Plate 3). The volcanic and basement rocks of this caldera are broken by

systems of radial and concentric fractures, and the rocks within and adjacent

to the caldera are broken, tilted and irregularly faulted. This widespread

Y rack failure developed access for hydrothermal solutions which permeated the

fault systems to cause profound rock alteration and selective mineralization

in the area.

E Widespread propylitic rock alteration occurred throughout the Silver- ton cal dera rreg gion n dur^in gng he t lIate t stages of vo1volcanismc as a r esultt offfl uidids and gases moving outward from the underlying magma chamber and mixing with

meteoric waters. The near surface rocks were altered to chlorite, calcite

and clays, whereas deeper epidote, albite, and chlorite are the predominant ^Y1) alteration minerals. As a consequence, the rocks of the Silverton caldera region have been well bleached to white, tan and light gray with superimposed

iron oxide staining in specific mineralized centers to brown, yellow, orange. ^I and red. The latter are readily identifiable on low level color photography. !E Strong, late alteration .by sulfur enriched fluids also developed

around the periphery of the Silverton caldera, along local faulted blocks

and related pipe. -like bodies of.breccia and.intrusive..rocks. This type of

alteration also has been effective near some of the channelways through which

these sulfur-enriched fluids passed. The adjacent rocks have been strongly

leached or silicified and kaolinized and permeated with both sulphates and

sulfides, They are well bleached and subsequently s tained by surface oxida- a 24

tion of pyrite. This sulfotaric alteration usually is restricted in nature

and can be identified, in some instances, on low level photography.

Mineralization in the Silverton caldera area is of two types: (a) vein

systems and ( b) chimney or breccia pipe deposits. The former occur in exten-

sive systems of open fissures and along major faults and splits. The latter

are found in solfateric centers along the margins of the Silverton caldera.

J.. The ore 'occurs as shoots within the veins and as a matrix of the breccias

within the chimneys. Some of the major veins can be identified on low and

intermediate photographs. LJ Apolication of Imagery

The overall features of the Silverton caldera are identifiable on

LANDSAT imagery. Semi -detailed caldera features and associated fault systems

are evident on intermediate level photography. Individual faults are appar-

ent on low level photography, some of which are known to be mineralized, but

Mineralization itself and hydrothermal alteration halos related to mineral-

ization are not recognizable.

LJ

ml^ { J^AMM111' 1 11' "own l ^ _ 25

IDAHO SPRINGS - CENTRAL CITY AREA

Introduction

The Idaho Springs-Central City area in the northern part of the

Colorado Mineral Belt is the second case history selected for this project.

This area lies about 30 miles west of along the southern edge of the

Mineral -Belt on the east slope of the Front Range. It has yielded an esti-

mated 170 million dollars worth of gold, silver, base metals, and uranium

since 1859.

Geologic Summary

Precambrian crystalline rocks, constituting the core of the front

Range are the host . rocks. of the . Idaho Springs-Central City area.: They cony

sist of an in terlayered and - generally conformable succession of gneissic,

granitic and pegmatiti c suites derived initially from a- sedimentary .sequence.

Nine different types of porphyriti c intrusive rocks of Early Tertiary age

cut across the Precambrian rocks inc]uding leucocratic granodiorite porphyry,

quartz monzonite porphyry, and bostonite porphyries.

The gneissic rocks were folded during Precambrian tim e to develop broad

north-northeast trending major folds which form the fundamental fabric of the

area.. They plunge gently to the northeast and southwest.' Some contain

siliceous breccias. A late Precambrian deformati on formed .northwest and

north-northeast faults. Locally they form a closely spaced network partic-

ularly in the Central City district, Near the end of the Early Eocene

igneous activity a third system of faults developed, Three main trends pre- f

dominate: northeast, east-northeast, and east (fig. 13).

The ore base metal deposits of the area consist of veins and stockworks

resulti ng from --i1.1ing of open spaces along faults and highly fractured zones.

a ,

r F":.-^ . . _ . t. Y.. .. , k .: - -,i.....&.:.1•,..'.N.FV .....,.Yn^....,,. i^.^' - - - .u....lv,..,.. ..ie_.. ^ .. _ ..f ...-._ ... _ _ -t ...... _ ... -_.1..

Pig. 13

R 74 W. _R. 73 _W.: ,-- --

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R, 7i W. ^osis fl. 73 N

MA!', SHOMMU THE ZONAL ARRANGEME:N7' OF THE Of

Iw- 27

UThe veins range from 1 to 3 feet in width and vary from well-defined,

single fissures to complex, mineralized fractured zones. An extensively

L shattered, pipe-like body in the Central City district consisting of closely

spaced, mineralized fractures, has been mined for its high gold content.

This stockwork appears to have been formed by explosive activity.

Hydrothermal alteration adjacent to the veins is strong, but restricted

to approximately the width of the vein on either side of the structure.

It Sericitizatton.iies in an inner zone whereas propylitization has developed

in an outer zone and grades outward into fresh rock. The hydrothermal

fluids responsible for both the alteration of the wall rocks and the miner-

aliertion of the veins are believed to have been generated from an underlying

magma body. shallow intrusives, faulting, alteration and mineralization

appear to be hood zone phenomena above the proposed magma body.

f Application of Photography. (Remote Sensing Technology)

Neither intermediate nor low level photography are effective in locat

inqY new veins or stockworks in the Idaho Springs-Central' Cit. area because

of lack of surface expression and.heavy vegetation and overburden. i I

u 28

c CONCLUSIONS

1. LANDSAT imagery can cover large areas quickly and inexpensively, and

there are some surface features in any given region that are general indi-

cators of possible mineralization.

2; Lineament analysis of the less known geologic portions of the

• Colorado Mineral Belt on LANDSAT, intermediate and low level photography in fil conjunction with remote sensing techniques and ground geologic mapping may

point to additional mineral target areas.

3. Orbital photography by itself is not considered adequate to ful-

fill exploration needs. It is useful in reducing the size of an exploration .. a ,; area,. but. like other remote sensing . techniques, it is an applicable tool

SSS(

IL-• _ - only when used in conjunction with detailed field.. work.

4. Linear structures are extractable from LANDSAT imagery.

.. S. Areas where orbital photography would be most useful in the search:

for mineral. deposits . i.ncl:ude desert.mountains or snow-free alpine mountains..

^ 6. Areas extensively covered by soi l, vegetation, clouds, or snow, im a no matter how favorable, are incapable of being evaluated. F _ Ll F

.< s.. ^...,..., ...'.. axa r r1 :1 a , ...', yyr _. a. J, { _. -.- _ ° ,v:e.,, • i,^S^t.^'.., .%ia.:t^iari; .s,.i:, n.xv - .:.. ,.,

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t .+\ ^` \ ,.^+ +fit 1 -}w ^ •`^^ as -^' ^ ^` d- \ \ \ ^^- {-+ ^ + ` t` \+ + `^. t JAMESTOWN_ ; a 1 ^- + -^, : ^ ^ GEORUT%^ N

-&, 4 CENTRAL': C i .TY•t •+...t"r sue;' .t.. .^:' x.•1-0 .i- -_, t y BOULDER i x

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.: GEOLOGIC NIAP SHOWING STRUCTURE OF PART OF THE SILVERV -). Cl OC'R^1^, SaJUAN. S^►^ N1IGi'EL, AN'D HI! SD, 1LF {] '^ y

Plata 3 2

1' 4 ry

1 ^

J ' EXPLANATION 1

[Upper TadW intrusive meiv Hat imewi./ dums SAM* *lime ..

x Tertivy .vd=aic formatiom d ^ f.efrdf^e Tsllund^[wrpfm..rgN ,5@ 1^ .7^.r. Fr.rect a2 b0Y _ ?k

—^ ' 1'P?^c taoeova and lover +f i Tertia[giatrusive:mcks p

/, I Paleamic and Steaowic sedimesmry mcb wlditfervatiated p ' FJI all IaeunnM

I?reesmDrian.[acka ^fn+rY ^. kt ^O1^v'^ .. GelydiwQ.aMi+^nemry..ura+ear'DAk. ^uu a+d eetrusetr nrk1: e.rlaw

Contact

^\ ^^^ r,^ f 11"ncipai fwurft dikes. veins. and minor {salts

^^ ' ^ 34ajor !salts _ Ae+Ard mMn apyrari++a+t^ly !salad T^^ - - ^,r.rn,^c^- - y i5 lnaud. wen.nliredlaeJt. _ _^

From: u.S.G.S. P.P. 535 (Plate 1)

A 1 f la JI

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^G STRUCTURE OF PART OF THE SLv SA\ JUAS. SAN NUGLESL. N-D HLN40A

forabo' ^3 Toed F ^^C~ EXPL A NATION } `^^ + f+ +• ♦•+•+ pill Ai TOs IGNEOUS AND METAMORPSIC ROCKS t + + ^^ MIDOL •+`\++;• ♦ ♦ + Op r = ♦ +^+ t t +R] ., t + • iie'r 4zzm.}Vplcanie ratk3 PM ♦ + KretRnrli e v El

♦ + +,+y l ♦ } StocRS Dikes and sill Loeroliths at "^ v a ^' • ^ I + T 40 groups of sill a o - « ; PA RI Loromida intiusiv..e rocks. UA ur .. } « 0 I .. tQra PM PM Granitic roc ks ccJ°'OdO Pits • • B/4^//^

MetamorpRiC rocAs W • r r v r + r r r 1p •M i L;nes ineice/e genera! to and °f fnlicrion; a pp • v v y r O r tlCrOGrrern-indiaafes freed: nar kfiOwR -- - i - - - r Y - r • • / r1`v - SEDIMENTARY ROCKS 4 TOa PM /' ^++ s ' ' Sedimentary rocks and surficiol decositS ¢ p. ^^+^ ^`i J TQs, TerNaiy oad Onarern°.r racks; = F T* ^i P PM, Pa/eoraiC and Ml ;prase roc" a P M LF r r +?+ # j Contact + ++ ..^ ^..r e r + • + } "a ARPRMUC ^ ^^ h11Rf(trR /r # , !f I:j 1 ^ `+ '^'^^ reign -angle .faun e I + l VINAL Aft Oasned rhere Inferred Vail « r + iilman * j Thrust foult += + ++ a♦ + pedClHf w Gashed Where interred; DorOv + + > M ^^ r ( porn! lorar4 npplr p/e/e v+} +^•"r/9 F`rT' t U (^

Shear zone PM Number refers to locality discussed in text ^' ^f^^rZ.% ' afr f .ip0i700 ;1p 0 Irma' a d to 0 is 20 30 MILES ^ ^ ^' (/ll^ /- ^,^/PMi

- w^ + + # + } f^^" + a r + + + + drl s^ + + ^tt . +.++ ++ t it}+ D I Outl§na of I PM ^` irl. Ptar• 1 +♦ + Asoen.. ~.^ +^.1+ Je l Mineral i3d! t t J ° 3.+ 6 rf Indeoendena^ y •+ « \ r . ++`,#^ \ 1 ^^f Y p ass C 0 L 0 R A q 0 ELK NIT S ' *Granite f r v v \ n Granite + Treasure br l+ ^ r r ._ r ^ t ^'+ x.. ++'a+ 3.90 Mountain f S .r 1}i/^+ + + + r I ndex MO.p `\` ++ ^ •+.+. P M \. fi T +' + + + \ a . S '^tlf^^JJ \ r Ta ar ^ ++ # + + i T'Os 1 PM r * . + .* +`Packs t§ , +. ,^ 1 PM ^` #+ '^ ^l 11 . *i V1 SIC TQs^ f ` crested Bulle `^} ^^ ` 1 `` 'f ^^ • y ^,\ \1, , \\ TOs low f v v r + \\PM , t t ^^ ` ` a r r ^^QQ «+ t \ ` ♦ v Y r Y (j/,],, 4. +' S N1\ \ ` `, \^^ \ ^PMI\U,Rx - •.v r r v r r. • r • w+^^++ ~ P1M1 ` \ \``^ PM r v r r r. r. r r r Aftnan! # + ^,^ ,` - c, ' r r • r v r r v r r `\ + it PM

PIN • + V. r r r r r v v v v v Gunnitan " *` \ ^.` + ++ 'Pf+ TQt +a}+^+ _ r 4- •+#+} ♦ 1VVV,^ °. - j ]jyi'^^^ rr r r r r. P r r.. v •. r f \` }J r^n I PM r^ r r v `_ r C ^^\ _1 I D \r , r + ® ` ~r ++ +^^ *' ^.. ,.+ •• + Ctmarran =y . v • r •: v \ \^. r . r : \ Win+ ^ r ? . r .PM + + r !1: GEOLOGIC SKETCH NM OP CEti"iR1 L CGLOO

L j TWETO v.N r 0I. p Cielesua{ 5utyy of Amrr^ss Mom. plume: 4

Plata 4 s. ' j IOSa IOM00` '

}a ttpwe *+^+ . ++ TQt M1 D DL PY ETQt rr + t «+r «+ / / ^f ♦ • .. of Sutosqrr . ,. + . / « ♦. ` • + + w+. + ` Knietnllop!i1.. a ► ^i.^^r gprfhgs *+rh + ++/ f * aaulder ♦ + . + L.' ' TQs • / { + + / 400OW PARK +. // /++^^^ .^\'+. «. ♦ t / ^^ Pfd ^ v } ` 0 ;+ , +^.. TQs Fro$&r + / 1 \ `\ 1 i }++*+ «'*+. ^tffI. • P11 Tt]s ` !^^/. `:f^:\ `F ^ « + # r r. Lob ,Ott y '- ii ^ i `` ^ ^ may" ^^^ 1.- ^ 1 ^ ^ 1 +++ t + Q r Psl • « OIV^ ^^/i ^/^ 3 ^ C 2. ^ \ ^ r/7^y ^ I^ / ^`\+ 'i - ^ ti 70f

^ 4 / + r v , c PM / ^ ? ` i, / arteoa I ^ Z •^ r en ral ^`^ ^ ^- rr- •. rr•.r a r-rw ++«+#•a`fr.-_ r•, n 4. ;^^40 crde^ ++♦ *++ l^ ^ ENVIER do eena ^ Cfeo

^toreldnd ! 6f ggtowd^ f+ ^,+ \ 1i PM a ,lam; ^^

*- *.+* ^^ `^ r;^ « # t + + + + Y + +^+^ -Nw /+!qA,. '' { PIG. +

+ + + . # r # + + + + .\ + + r + + + j a ^t « t + .. + 0 0 1 airplay +++rr+h+^i + + + + + .++««+++++t++#++ + ♦ + « + t s 12 { 0 r + + + + r r + + « + 1 + + t + + + r ♦ +

A. R T 1 + r h . + . r + + h + + + 4 .+ ^ + + a o + + h i + tot . o + a\ tS + + + + r ` + + + + ++ 9 + a t +1 p}A {+rte'++ ♦++ + + + r . + X6''1] ♦ Q t + r + + ♦ t + + + t + + + + ♦+ + +` I ! { f 4, Z y^ r + + + r + + + t ± « r r + + 3,j.4tyEndfnClf + + , .1 ♦ -:+ +. +.^ - _ + . r + t _^ + - +\ t+ t + }^ :9 i. r. Pass - .+++ - ^ ^.* ► ♦ ++ + + ♦ +++1 +♦++ PM++++ 111 ++ + « { 1 1+ TQs "• v f ♦ + .^+ r r .. r , G +1 Z i f Y ." / ♦+ ++ +} r+ r, + r .+ + + +.+ «y +t #r + r + .r '^ 1 ^+ r+ - ++ +I G1 PM Pil all ?M +t ++ + + + ` + + r }_ + + + r + 1 + +- + + {^4 39°nt) ° .; +' + + . + + + 1 ^^ + + r + + +. r +\. + + +1 ♦ # t ++r^-r +Y+ + r + • + .^ s a {. . + + +. +. T +^^^ . N Toyarl .` '^ a + + + r r • r r r Y r • `:`\ 11 •+ + + T0f 1 + + + } r + r .a , "++'A\i?7rk^ t .,^ • -+. .} a1 } + ^+ a ^ ++ t++++ + + k p. + 1 + v r r r r v r ` r r ♦ ♦ + + L ! r + + r +-+ + + ^r,-4 ^' ^^ - _.^li[ _ /i + +: + -.^ + _ r r v r r r r. *+F++. 4 PM - r r r r r r v } + + + + « + + + + t + t « r ^`^1 ^ `` 1 ^ * }+++ Ia +a I1} $^\ ```;`` ;.^ -^ =Qf t +\ r r. r rr r r r .j+{++. ++ ++++++++.{+.{++++;`l -

} + ♦ . ♦ PM le r1;.^ J + + + + +. •- # w \ \ ^^ •\ \ _ t r r r r ^\ r r IF + +Cri9p L^^ r +++ ++++ +++ + + r \ 1' WW1 + ♦ r r.♦ ++ s'. ^^ \ ` K. P 1 nnGe17 \ t :..w^ r : r • r r v r: + reek + r +- + _. - -^^\- -\ \^^^^ - aa- `,\ - IF FPM . # o^n } Y + r + w r + { + + .T # + + } + + + +^ \^ f + , \ Y' V. r Y Y V' V r Y' a +.. . 4r", T Y + + # + # .T. + # «+ 1 i^ `, 1 ` \ gmo r ►♦ + # + i +'t+'♦ 4 + l` r ♦ T + ^ T h a +' +' + Vf ♦ + • + -. 4^\ ' ^ ^ L ,`+,\ T .t - 1+ a: v + . ^ PM M _ \^^^ ^\^ti a,^ ►+ + +^ • r r ^' ^ v ^ `, + . +- _

^ Phl P+w J + r. ^:- ~1 ...- ++i '+ r Y ,/', PIA `! 1 a ♦ PM 4 • / l Tom r + + • ' r v +^ \ ^^+# ti++ ++14it \ . _ SaiiaG PM_ *r«++ P41 + r r .. .. \ con.an city - •Y "a Based ' an_."ologic map of Colorado U. Sr Gtoloq'Cat end Lorerinq and Goddard 09 50, P'. a;* GEOtAGIC 5]GEltit{ MAP CEYTP 1L COLORADO [t^ rfr yaa Dr Ogden- 'ratio and P X..SIM%, 1960 d _ r-j Igc[a.def . pubhshsd Qo:.a [rOm spur5e.4 listen unaer . ^ RfftlL.RRC^t QI!Q st^.FVd^hed Os^a rrca Yed

A .,_ ., _^ s ^ ,^ •r^^ -aawas.^,=^^^,,.,.;r,v:^, .^...^ .._a^,^$--=" ^F ,,,^s.^;^ _.... ,ei..^.^x.^ __r.,. ,_._ ^,..

-.:1 Li Northern Front Range area Aspen-Gunnison area ^i LANDSAT - 1 LANDSAT = 1 1172-17135 1 551-1 71 61 .1190-17140 :1515-.171 71 1550-17 00 •1407-17190 LANDSAT - 2 1461-1 7174 2186-17015 1299-172.03 2168-17022 LANDSAT - 2 2259-17070 Southern Front Range area LANDSAT - 1- San Juan. Mountains area . 1172-17141 LANDSAT 1. 1190-17143 1551-1 7163 1153-17143 1191-17204 F -; I&=. AT .2- 1461 -17181. 2186-,17022 1425-17190 2276-i 7011 1299--17205 LANDSAT - 2 area 2259-170?3 LANDSAT -.1 1550-17105 Grand Junction area 1172-17144 LANDSAT - 1 LANDSAT - 2 1516-17225 2276-17013 1156-17260 218b-17024. 146:2- 7233 j LANDSAT - 2 ., L North Park Area 22.60-1-7124 fk LANDSAT + 1 ^I }t 1515-t 7165 1:551-17154 119: -17195 -1461-17172 1299-z 72.00 LANDSAT _ ,- 2 2187-17074

^:r Table II. Key to Mining Districts I

(1) Jamestown-Gold Hill (2) Caribou-Nederland (3) Black Hawk-Central City-Idaho Springs-Georgetown (4) Montezuma-Breckenridge U. (5) Kokomo-Climax-Leadvill.e (6). Battle Mountain (Red Cliff * Gilman) (7) Homestake (8) Independence (9) Aspen Ashcroft-Sinowmass (10) Marble (11) ;Taylor River (12) Winfield (13) Cottonwood (14 ). 'Tincup (15)'Pitkin-Ohio City (16) St.. Elmo-Chalk Creek.. (17) Garfield-Monarch (18) Creede (19) :Lake City-O:uray-S lverton--Telluride Y (20) Rico

i

5*{ Lj L

Table III. Geologic maps used in the identification r. U11 topolinearsof

1 iUSGS GQ Series USGS MF Series „ 152 Ouray 176' Gray Head 267 Central City 760 Leadville 291 Ironton 761 Montrose } 443 . ~ 5 04 Telluride USES I Series ^.. ^ 512 Marble _...76 Durango .536 . 578 oh-Be-Joyful 631 Bristol Head - 788: 797 Rico 8.33 Nederland 853 $63 Hayden Peak Highland Peak ` 932. 933 AspenAsP 978 Tungsten .1 ,004 Ruedi` 1011'Wetterhorn .1052 Spar City 1053 Creede

1177 Rudolph Hill f 1178 Powderhorn 1248 Black Hawk - 1277. Ward 12$7 Houston Gulch

a:

.. . . n 'asllll lllllllll^ f . ^•,s.. . ::

PART III -- Selected References by Mineral. District . Alma - - i Aspen Blue River- Bonanza Breckenridge . Brush Creek Calumet . . Caribou Cebolla Central City Central Jameston Clima Cochetopa " Creede I Cripple Creek Crystal Mountain Empire t^I Eureka Freeland-Lamer t irie Georgetown r:. Gold Brick Gold Hill Gilman Horse Shoe Idledale Irwin ' Kokomo Lake Coma • I I LA Plata T Lawson-Dumont Leadville Magnolia.: ! Marshall Pass Mineral Point Monarch Montezuma

g. . flW. ... i:u '... ^...^..-.-. ._ ,: ...i:..-.;E^+:,...... n1'^ _'ffil.^m.uu....}.4..R,;i::.t~_^.-.M.-a.li,vs..vei..Si...^.W^.. [.s'^S.dOtnlr^ ti1^(eFI.^Y .rul.: GSS r,.., ..- ..._ e.. i' .. •.i..:.... _, ....h :. .._ PART III -- Selected References by Mineral District - Continued - . North Gate Ouray Placerville Platoro-Summitville Poughkeepsie Powderhorn Quartz Creek Red Cliff Red Mountain Rico `S gilverton. Slick Rock f ; 5neffels Summitville:. r, Tarryall Telfur ide Ten .Mile . Tin Cup Tomichi Tungsten Twin Lakes Uncompahgre Uravam Ward Weston Pass White Pine

t... _::.. . I.A

_., PART I

SELECTED REFERENCES ON COLORADO MINERAL RESOURCES

a

=i !II 'd

S r..

k

^ss.a^a.^:N.^ic^ r-ie..^-Area'adv_es:Su1 4M1^L'N "',^ ^]l5}7dtlGH16L1^ s^^.e1YY.AL..':if6vHua^.xwJ.!c ^..^idn.^.'ivi}GL44ii^tM w.^e.^_ S.F.-v. ^_ rc .^^_.__,. .. ^.. _. _ -. _ _ SELECTED REFERENCES ON COLORADO MINERAL RESOURCES

Argall, G. 0., Jr., 1949, Industrial minerals of Colorado: Colorado School of Mines Quart., v. 44, no. 2, 477 p., 2 pls.

Aurand, H. A., 1920a, Fluorspar deposits of Colorado: Colorado Geol. Survey Bull. 18, 94 pe

1920b, Mineral deposits of the Western Slope.-Colorado Geol. Survey Bull. 22, 78 p., 2 p1s.

Baille, W. N., 1962, Silver in'Colorado, CSM Min. Ind. Bulletin, vol. 5, no. 5.

Blanchard, R.. and Boswell, P. F., 1935, Limonite of molybdenumite derivation, Economic Geology, vol. 30, no. 6.

Branch of Mineral Classification, Conservation Division, 1971, Reported occurrences of selected minerals . in Colorado: U.S. Geol. Survey Mineral Inv. Resource Map MR-57.

Burbank, W. S., Lovering. T. S., Goddard, E. N., and Eckel, E. B., 1935 [repr. 19671, Geologic map of Colorado. U.S. Geol.. Survey, Colorado Geol. Survey, and Colorado Metal Mining Fund.

Burke, M. B., 1964, Molybdenum: Colorado School Mines Mineral Industries Bull., v. 71, no. 1, 14 p.

Bush, A. L., 1951, Sources of lightweight aggregates in Colorado: Colorado Sci. Soc. Proc., v. 15, no. 8, p. 305-368.

Butler, B. S., 1929, Relation of the ore deposits of the southern Rocky Mtn. region in the , Colorado Science Society Proc., No. 12.

Butler, G. -, 1914, The clays of eastern Colorado: Colorado Geol. Survey Bull. 8, 353 p.

Colorado Metal Mining Fund Board, 1960, Tungsten mines of Colorado: Color- ado Metal Mining Fund Board 78 :p.

Mining 1961, Colorado vanadium A composite study: Colorado Metal Fund . Board, 155 p...

Del Rio, S. M., 1960, Mineral resources of Colorado, first sequel: Denver, Colo., Publishers Press, 764 p., 6 p1s.

Eckel, E. B. 9 1.9.61 9 Minerals of Colorado a 100-year record: U.S. Geol. Survey Bull. 1114 , 399 p., I pl. ^ ^^Y F ineh, : J W•,. 1931 o. . General correlation and synchrony of the Colorado ore deposits, Colorado Scientific Soc. Prod., Vol. 12, no. 11.

Fischer, R. P., 1936, Peculiar hydrothermal copper-bearing veins of the north- eastern Colorado Platea u: Economic Geology, vol. 31,. no. 6. r

Fischer, R. P., Burbank, W. S., Cannon, H. L., and others, 1946, Map showing mineral deposits of Colorado: U. S. Geol. Survey Missouri Basin. Studies Map 8. Gabelman, J. W., 1952, Definition of a mineral belt in south central Colorado.. Ge)41. Soc. Am., vol. 63, no. 12.

Gabelman, J. W., 1960, Tectonic control of the mineral belts in the south- western Colorado metallogenic province, Am. Ingt. Min. Met. and Retro.

9'1 Eng., vol. 117.

Harrer, C. M., and Tesch, W. J., Jr., 1959, Reconnaissance of iron occurrences in Colorado: U. S. Bur. Mines Inf. Circ. 7918, 82 p. ^. F Henderson, C. W., 1926, Mining in. Colorado -- A history of discovery, develop- ment, and production: U. S. Geol. Survey Prof. Paper 138, 263 p., 1 pl. Heyl, A. V., 1964, Oxidized zinc deposits of the United States, including parts on Colorado, U.S.G.S. Bulletin 1135-C. U111 Holt, R. D., 1972, Bibliography, coal resources in Colorado: Colorado Geol. Survey Bull. 34-A, 32 p. Horner, R. R., and Coghill, W. H., 1921, Investigation of low-grade and L^' complex ores in Colorado: U.S. Bur. Mines Report Invest. 2206. Jones, 0. M. 1914, geology and mining with subject index from the earilest exploration to 1912, Colorado Geol. Survey Bull. 7. Landis, E. R., 1959, Coal resources of Colorado: U. S. Geol. Survey Bull. 1072-C, 101 p., 2 pls.

Larrabee, D. X., Clabaugh, S. , E., Griffitts, W. R., Fischer, E. C., Fox, ^f E. L., and Bryson, R. P., 1946, Construction materials and non- metallic minerals of Colorado--Report and data sheets: U. S. Geol. jr Survey, 543 p.

Larrabee, D. M., Glabaugh, S. E., Griffitts, W. R., and others, 1947, Map showing construction materials and nonmetallic mineral resources of Colorado: U. S. Geol. Survey Missouri. Basin Studies Map 10.

Lovering, T. S. 1930, Localization of ore in the schists and gneisses of the mineral belt of the Front Range, Colorado, Colorado Science Soc. Proc., vol. 12, no. 7.

Lovering, T. S. and Goddard, E. K., 1950, Geology and ore deposits of the Front Range, Colorado, U.S.G.S. Prof. Paper 223.

Marsh, W. R., and Queen, R. W., 1974, Map showing localities and amounts of metallic mineral production in Colorado: U.S. Geol. Survey Mineral Inv. Resources Map MR-58.

IIMAAAAIQltA.1AA 1

Nuilenburg, G. A., 1919, Manganese deposits of . Colorado: Colorado Geol. Survey Bull. 15, 76 p. Sharps, T. 1., 1963, Dimension stone in Colorado: Colorado School Mines ^j Mineral Industries Bull, v. 6., no. 1, 12 p. lweto, Ogden, 1963, Precambrian ancestry of the Colorado mineral belt, G.S.A. Bulletin, vol. 74, no. 8: U. S. Geological Survey, and Colorado Mining Industrial Development Board,. } 1968, Mineral and water resources of Colorado . [ Report for the use of II. S. Senate Committee on Insular Affairs, 88th Cong., 2nd sess.j: Washington, U. S. Govt. Printing Office, 302 p.

Vanderwilt, J. W., 1947 , Field conference in central Colorado, Rocky `Mtn. Geologists Assn. Guidebook. q Vandexwilt, J. W., 1947, Mineral resources of Colorado: Denver, Colo., Colorado Mining Assoc., 5.47 .p., 34 pis.'

Van Sant, J. N., 1959, Refractory-clay deposits of Colorad o: U. S. Bur, Mines Rept. Inv. 5553, 156 p.

Williamson, D. R., 1961, Guide to Colorado gold deposits: Colorado School C Mines Mineral Industries Bull„ v. 4, no. 3, 12 p. is 1963,'Colorado gypsum and anhydrite: Colorado School Mines Mine:a1 Industries Bull., v. 63 no. 2, 20 p. Williamson, D. R., and Burgin., Lorraine, 1960, Limestone occurrences in Colorado: Colorado School. Mines Mineral Industries Bull., v. 3,' ^I no. 3, 12 p. Worchester, P. G., 1919, Molybdenum deposits of Colorado with general cotes on the molybdenum industry, Colo. Geol. Sur., Bulletin 14.

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^ *^ bi

SELECTED REFERENCES ON BOULDER COUNTY MINERAL RESOURCES

Baillie, Us N., 1962a,, FeLLspar occurrences in Colorado: Colorado School Mines HineraL Indus=:Les Bull. , ' ve. 5 9 no s 4 9 12 pe

1962b, Silver im Colorado: Colorado School Mines Mineral Industries yr Bull., V. 5. no., 5. W P.

Bastin., E.. S., and Hill, J. X., 1917, Economic geology of Gilpin County and adjacent parts of Clear Creek and Boulder Counties t Coloradol Us S. Geol. Survey Prof. Paper 94, 379 p . & lOpls.

Belser, Carl, .1955. A study of the tun..Zsten potential in Boulder Gd=ty l,. Colo.: Us S. Bur. himes . Inf. Circ., 7721, 39 p.

1960, Tungsten wing and milling in Boulder County., Colo.: U s S. Bur. 1%1ines Inf. Circ.-'7936, 54 P.

Chase t G. H., and NcConaghy. J. A., 1972, Generalized surficial geologic map of the Denver area, Co1orado ., Us S. Geol. Survey Misc. Geol. Inv. Map 1-731.

Colton, R. B., and Fitch,. E.. R., 1974, Hap showing potential sources of gravel and crushed-rock.aggregate in the Boulder-Fort Collins-Greeley area.* Front Range Urban Corridor,-Colorado: U s S. Geol. Survey Misc. Geol. Inv. Man 1-855-D4

Z=ons, S. F., Crass, Whitman, and Eldridge, G. E., 1896, Geology of the is Colorado: Us S. Geol. Survey Mon. 27, 556 p., 5 pls. "A George, R. D., 19CS, The main tungsten area of Boulder Co., Colorado, Colorado Geol. Sur. na- 1. 1^^

Goddard, E. N., an&Loverftg, T. S., 1942, Nickel deposit near Gold Hill, Boulder County,. CdlQr3d0. U. S. Geol. Survey Bull. 931-0, 13 p., 1 pl.

1 . ' A Hild, J. g .,. and Atim s, E. W., 1949., Investigation9 of Jamestown fluorite deposits, Boulder County, Colo . : Us S. Bur. Mines Rept. Inv. 4483, 10 p. i......

Larsen, V. E., 1956, The hard rack geology of Boulder Co . * Colorado, Compass, vol. 27, no. 3..

Lindgren, Us 1907, Some gold and tungsten deposits of Boulder Co., Colorado, Economic GeolaW., vol. 2.

Loomis, F. B. 1937, Boulder County Tungsten Ores, Economic Geologys vol. 32.

Lovering, T. S., 193Z, Preliminary map showing the relations of ore deposits to geologic structure -in Boulder Co., Colorado.,. Colorado. Sci. Soc. Prot., vol. 13, no. 3. r

1941, The origin of tungsten ores of Boulder Co.,.Colorado,_ Economic Geology. vol. 36, no. 3. Lovering, S. S., and Goddard, E.'N.,'l950, Geology and are deposits of the Front Range, Colorado: U. S. Geol. Survey Prof. Paper 223, 319 p., 30 p1s. + Lovering, T. S., and Tweto, Ogden, 1953, Geology and are deposits of the Boulder County tungsten district, Colorado: U. S. Geol. Survey Prof. Paper 245, 199 p., 27 pis.

Lowrie, R. L.., 1966, Analysis -of the coal Industry in Boulder-Weld Coalfield, Colorado: U S. Bur. Mines Rapt. Inv. 6726, 79 p. Martin., G. C., 1909, The Niobrara limestone of as a possible source of Portland cement material:- U. S.. Geol. Survey Bull. 350-3, " p• 314-326: u 1910, Coal of the Denver Basin, Colorado: U. S. Geol. Survey Bull. 381-C, P. 297-306:

Scbwochow, S. D. Shrobay R. R. and.Wicklein,. P. C., 1974a, Sand,: gravel, and quarry. aggregate resources, Colorado Front Range counties: Colorado Geol. Survey Spec. Pub. 5-A, 43 p., 3 pis. = 1974b, Atlas of sand, gravel, and quarry aggregate resources, Colorado Geol. Survey Spec. Pub. 5-B,212 pls. ^i Colorado Front Range counties:

-: Sharps, T. T., 1962, Colorado mica: Colorado School Mines Mineral Industries.-. ' Bv.110.0 v. 5, no. 1, 15 p. 1965a,Tungsten in Colorado: Colorado School Mines Mineral Industries Bull., v; 8, na. 5, 16; p. s ( ` '1965b, Sulfur deposits of Colorado: Colorado, School Mines Mineral 1 Industries Bull., v. 8, no. b, 8 p.

Tweto, Ogden, 1947, S,cheelite in the Boulder District, Colorado, Economic Geology, vol, 42, no. 1. Wahlstrom, E. E., 1940, Ore Deposits at Camp Albion, Boulder Co, Colorado, Economic Geology, vol. 35, no. 4.

Warne, J. D., and Everett. , F. D.., 1953, Investigation of the Boulder County: tungsten district, Boulder County, Colo.: U. S. Bur. Mines Rapt. Inv. 4973, 30 p. M

Wideman, F. L., 19S7, .A reconnaissance of: sulfur resources in Wyoming, Colorado, Utah, New vaxico. and Arizona: U. S. Bur. Mines In£. Circ. 7770, 63 p. Worcester, P. G., 1919, `Molybdenum deposits of Colorado, with general notes on - the ;solybdenua industry: Colorado Geoi. Survey Bull.. 14, 131 p., 2 pis.

1920 9 The geology of the Ward region, Boulder County, Colorado; . Colorado Geo1, Survey Bull. 21, 74 p., 2 pis.

_m.-.-^y..._^ _.;,.,: "_.. ^,,., -•, W..v'^6 _._...w.s,.:..^" s-A ^^:^^nYL"^4aa'm3u,.ti..a,.,^, .... - ' A s ys ..:s « , ^ ... - . , e a, ^:. ^ .- .. 7 SELECTED REFERENCES ON CHAFFEE COUNTY MINERAL RESOURCES

Adams, J. We 1953, Beryllium deposits of the region, Chaffee County, Colorado: U: S. Geol. Survey Bull. 982-D, 24 p.

elmee, E. W, 194"6, Exploration of the Jewell Tunnel zinc property, Chaffee • County, Colorado: U. S. Bur. Mines Rept. Inv. 3933. 12..p. .

$aillie, W. N., 1962a, Feldspar occurrences in Colorado: Colorado School Mines ' Mineral Industries Bull., v. 5 9 no.. 4 9 12 p.

1,962b, Silver in Colorado: Colorado School Mines Mineral Industries _ Bull., v. 5, no. 5, 18 p

Belser, Carl, 1956, Tungsten potential in Chaffee, Fremont, Gunnison, lake, Latimer, Park, and Summit Counties, Colo.: U. S. Bur. Mines Inf. Circ, 7748, 31 p

Crawford, R. D. 1910, A prel3mfnary report on the geology of the Monarch mining district:, Chaffee County, Colorado:. Colorado Geol. Survey Bull. 1, 78 p.

...1913, Geology and ore deposits of.the Monarch and Tomichi districts, .? Colorado:: Colorado Geol. Survey Bull. 4,-317 pe t 5 pls.

{{ Dings, Me G., and Robinson, C. S:, 1957, Geology and ore deposits of the Garfield awl quadrangle, Colorado: U. S.. Geol. Survey. Prof:. Paper 289,. 210 p.., 13 pls.

F. M. Fox and Associates, 3974, Reconnaissance engineering geology report for _ Planning Districts 7 and 13, State of Colorado: Colorado Geol. Survey Environmental Geology Rept. 3,..44 p'., 2 pls. 0

SELECTED REFERENCES ON CLEAR CREEK COMM MINERAL RESOURCES

Baillie, W. No, 1962a, Feldspar 'occurrences in Colorado: C olorado School Mines Mineral Industries Bull., v. 5, no. 4, 12 p.

1962b, Silver in Colorado: Colorado School mines mineral industries Bull *$ ve 5 9 no. 5 9 is p-

L{ Bastin, Ee So, and Hill, J. Xos 1917, Economic geology of Gilpin County and adjacent parts of Clear Creek and Boulder Counties, Colorado: U. So b": Geol. Survey Prof. Paper 94, 379 p., 10 p1s. Braddock, W. A. W 1969, Geology of the Empire quadrangle, Grand, Gilpin, and. Clear Creek Counties, Colori ado: U. So Geol. Survey Prof. Paper 616, 56 p., 3 p1s.

Gardner * E. Do, and Guiteras,.J. R. 1937, Placer operations of Humphreys Gold Corporation, clear Creek, Colo. U. So Bur, Mines Inf. Cire. 6951,:10 Guiteras, J. R., 1939, Mining and milling methods and costs atthe Alice Unit , of the American Smelting and Refining Co., Alice, Colo.: U. So Bur. Mines Inf. Circ. 7058, 15 p. the Harrison, J. E.,and Leonard, B.'F., 1952, Preliminary report on Jo Reynolds area, Lwjson-D=ont district, Clear Creek County, Colorado: U. So Geoli, Survey Circ. 213, 9.p. j, 2 p1s.

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-2- t Sharps, T. I.., 1965a, Tungsten in Colorado: Colorado School Mines Mineral Industries Bull., v..8, no. 5, 16 p.

1965b, Sulfur deposits of Colorado: Colorado School Mines Mineral Industries Bull., v. 8, no. 6, 8 p. - i Sams, P. K.„ and others, 1963, Geology of uranium and associated ore deposits, central part of the Front Range mineral belt.,. 'Colorado: U. S. Geol. Survey Prof. Paper 371, 119 p., 9 pls.

Sims, P n., and Sheridan, D. H., 1964, Geology of uranium deposits in the Front Range, Colorado: U. S. Geol. Survey Bull. 1159, 116 pe,.5'pls. Spurr J. E., and Garrey, G. H., 1908, Economic geology of the Georgetown quadrangle (together with the Empire district), with..general geology by S. R. Ball: U. S. Geol. Survey Prof. Paper 63, 422 p., 61 pls. Tooker, E. W., 1963, Altered wallrocks in the central part of the front range mineral belt, C ; 1pin and Clear Creek Counties,.Colorado, USGS Prof. Paper:434. iA Wells, J. U., and Harrison, J. E., 1954, Radioactivity reconnaissance of part of north-central Clear Creek County, Colorado: U. S. Geol. Survey Circ. 345, 9 P. Wideman, F. L., 1957, A reconnaissance of sulfur resources in Wyoming, Colorado, Utah,• New Mexico, and Arizona: U. S.`Bur. Mines Inf. Circ. 7770, 61 P.

L3 Worcester, P. G., 1919, Molybdenum deposits of Colorado, with general notes on the molybdenum industry: Colorado Geol. Survey Bull. 14,- 131 p., 2 pls.

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SELECTED REFERENCES ON DELTA COUNTY MINERAL RESOURCES

Jobnson,, V. H«, 1948, Geology of the Paonia coal field, Delta and Gunnison Counties, Colorado: U. S. Geol. Survey Coal Inv. Map.

Lee., Wo To 1909, ' The, Grand.Mesa coal field,. . Colorado: U. S. Geol. Survey Bull. 341-0, p. 316-334. i 1912, Coal fields of and the West , Colo- rado:- U S. Geol., Survey Bull. 510, 237 p.., l pl...

. W. Sharps, T. 14, 1965, Sulfur deposits of Colorado: Colorado School Mines .q Mineral Industries Bull., v. 8 1, no w 6, 8 p«

Speltz., C. N., 1974, Strippable coal resources of Colorado--Location, tonnage, and eharacterisitcs: U. S. Bur. Mines Prelim. Rapt. 195, 68 P. Wideman, F. 3..,1957, A reconnaissance of'sulfur:resources in Wyoming., Colorado, . Utah, New Mexico, and Arizona; U. S« Bur. Mines Inf. Circ. 7770. , 61 p. Woodruff, E. G., 1912, The coal resources of Gunnison Valley, Mesa and 'Delta Counties, Colorado :_ U. S. Geol. Survey Bull. 471-H, p. 565-5730

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SELECTED.REFERENCES ON DOLORES COUNTY MINERAL RESOURCES

r Baillie, W. N., 1962, Silver in Colorado: Colorado School Mines Mineral, Indus- tries Bull., v. 5.2 no. 5, 18 p. Coffin, R. C., 1921, Radium, uranium, and vanadium deposits of southwestern Colorado: Colorado Geol. Survey Bull. 16., 231. p., 3 pls. Finley, E. A., 1951, Geology of the Dove Creek Area, Dolores and Montezuma Counties, Colorado, USGS Oil and Gas Investigations Map, OM-120.

F. M..Fox :and Associates, 1974, Reconnaissance engineering geology report for Planning-District 9, State of Colorado: Colorado Geol. Survey Environmental ' Geology Rept. 4, 36 p., 1 pl.

McKnight, E. T., 19.74, Geology and ore deposits of the Rico district, Colorado: U. S. Geol. Survey Prof. Paper 723, 100 p., 3 pls. Sharps, T. .T., 1963, Lead and zinc in Colorado: Colorado School Mines Mineral Industries Bull., v. 6, no. 6, 15 p. 1965, Sulfur deposits of Colorado: Colorado School Mines Mineral `u Industries. Bull., v. .8, no. 6, 8 p. Speltz, C. N., 1974, Strippable coal resources of Colorado -- Location, tonnage, and characteristics: U. S. Bur. Mines Prelim. Rept. 195, 68 p. . Wideman, F. L., 1957, A reconnaissance of sulfur resources in Wyoming, Colorado, Utah, New Mexico, and Arizona: U. S. Bur. Mines Ihf. Circ. 7770, 61 p. ##

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SELECTED REFERENCES ON DOUGLAS COUNTY MINERAL RESOURCES -I

,< Z Baillie, W. N., 1962, Feldspar occurrences in. Colorado: Colorado School Mines Mineral.Iudusuies Bull. v. S, no. 4., 12 p:

Chase, G. H.., and McConaghy, J. A., 1972, Generalized surficial geologic map of the Deaver area,.Colorado: U. S. Geol. Survey Hisc. Ceo1, Inv. Map 1-731,

Emmons, S. F., Cross, Whitman, and Eldridge, G.E., 18 9b, Geology of the.Denver Basin in Colorado: U. S. Geol,. Survey Mon. 27, 5`55 p., 5 pls. w Schwvchow, S. D., St roba, R. R. , and Wicklain, P. C , 1974a, Sand, gravel, and quarry aggregate resources, Colorado Front Mange Counties: Colorado Geol.' Survey-Spec. Pub. 5=A, 43 pas 3 p1s. 1974b, Atlas of sand, gravel, and quarry aggregate resources, Colorado Front Range Counties. Colorado Geol. Survey Spec. Pub. 5-B, 212 pls Solster, Pa . E.10 1974, A preliminary report on a zone containing thick lignite beds,. Denver Basin, Colorado: U. S. Geol. Survey, opea-file reps., 48 p.

Trimble D. E., and Fitch, H. R., 1974, Map showing potential sources of gravel and crushed-rock aggregate in the Colorado Springs-Castle Rock area,. Front Range Urban Corridor, Colorado: U. S.-Geol. Survey Misc. Geol. Inv. Map t. 1857-A -

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u i^ SELECTED REFERENCES ON EAGLE COUNTY MINERAL RESOURCES

Baillie, k. N., 1962, Silver is Colorado: Colorado School Mines Mineral Industries Bull.., v. 3, no. 5, 18 p. Burchard, E. F., 1911, Gypsum deposit in Eagle County, Colorado: U. S. Geol. Survey Bull. 470-G, .p. 354-365.

CrCrawford, RR. D., and Gibson, Russell, 192 5,Geology gY and ore depositsP s of the Red. Cliff district, Colorado: Colorado Geol. Survey Bull. 30, 89 p., 3 p1s. Mallory, W. W., 1971, The Eagle Valley Evaporite, northwest Colorado--A regional synthesis: U. S. Geol. Survey Bull. 1311-E, 37 p., 3 pls.

Mallory.,. W. W.., Post, E. V. Vie, P. J., Lehmbeck, W. L., and Stotelmeyer; R. B., 1966, Mineral resources of the primitive area, Colorado: U. S. Geol. Survey Bull. 1230-C,: 30 p , 2 plse Sharps, T. 1., 1963, Lead and alnc in Colorado: Colorado School Mines Mineral Industries Bu3.I . , v. 6. no. 6, .15 P. r. 1965, Sulfur deposits of Colorado Colorado School Mines Mineral Industries Bull., v. 8, no. 6 9 8 p.'

Wow, Ogden, and Bryant, Bruce; 1970, Mineral resources of the - Eagles Nest Primitive area and vicinity, Summit and Eagle Counties, Colorado: U. S. Geol. Survey Bull, 3319-C, 127 p., 2 pls.

Wideman, F. L., 1957, A reconnaissance of sulfur resources in Wyoming, Colorado, Utah., New tu.Sico, and Arizona: U. S. Bur. Mines Inf. Circ. 7770, 61 p.

Worcester, P. G., 1919, Molybdenum deposits of Colorado, with general notes on the molyhdeaum.industry: Colorado Geol. Survey Bull. 14, 131 p., 2 pls.

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SELECTED REFERENCES ON FREMONT COUNTY MINERAL RESOURCES

Baiilfe, V. N., 1962, Feldspar occurrences in Colorado: Colorado School Mines Mineral Industries Bull., v. 5, no. 4, 12 p. Becker, R. M., Shannon, 5..,F .., and Rose, C. K., 1961, Iron mountain tiffaniferous magnetite deposits, Fremont Co., Colorado, USBM Report Invest. 5864.

Baillie, k'. N., 1962, Feldspar occurrences in Colorado: Colorado School Mines Mineral Industries Bull., v. 5, no. 4 ., 12 p. Belser, Carl., 1956, Tungsten potential. in Chaffee, Fremont, Gunnison, Lake, U11 Laritmer, Park, and Summit Counties, Colo.: U. S. Bur. Mines Inf. Circ. 7748 0 -31 p.

Christman, R. A., Brock, M. R., Pearson, R. C., and Singewrald, Q. D., 1959, Geology and thorium deposits of the , Colorado--A progress report.: U. S. Geol. Survey Bull. 1072-H, 44 p., 2 pis.

Christman, R. A., Heyman, A. M., Dellwig, L F., and Gott, G. B., 1953, Thorium investigations, 1950-52, Wet Mountains, Colorado: U. S. Geol. Survey Circ. 294, 40 p., 5 pis. s

F. X. Fox and Associates, 1974, Reconna issance engineering geology report for I Planning Districts 7 and 13, State of Colorado: Colorado Geol. Survey Environmental Geology Rapt. 3., - 44 p., 2 pls. i Lindgren, Waldemar, 1908, Notes on copper deposits in Chaffee, Fremont, and (• Jefferson. Counties, Colorado: -U. S. Geol. Survey Bull. 340-B, p. 35.7-174.

^ Sharps, T. I., 1962, Colorado mica: Colorado School Mines Mineral Industries Bull., v. 5 no. 1 9 15 p.

1963 9 Lead and zinc in Colorado: Colorado School Mines Mineral • Industries Bulb., v.. 6, no. 6, 15 p. j, i ^

SELECTED REFERENCES ON GARFIELD COUNTY MINERAL RESOURCES

Alderson, V. C., 1925, Colorado oil shale: Colorado School Mines Quart., v. 20, no. 2, 53 p. Bass, N. W., 1963, Geology of Glenwood Springs quad and vicinity, , USGS Bull. 1142-J. Erdman, C. Be, 1934, The Book Cliffs Coalfield in Garfield and Mesa Counties, Colorado: V. S. Geol. Survey Bull. 851, 150 p., 10 pls.

Fischer, R. P., 1960, Vanadium-uranium deposits of the Rifle Creek area, iL Garfield County, Colorado: U. S. Geol. Survey Bull. 1101, 52 p., 4 pls. Gale; H. S., 1909, Coal fields of northwestern Colorado and northeastern Utah: U. S. Geol. Survey Bull. 341 •-C, p. 283-315. ^l 1910, Coal fields of northwestern Colorado and northeastern Utah: U. S. Geol. Survey Bull.. 415, 265 p., 3 pis. George, R. D., 1921, Oil shales of Colorado: -Colorado Geol. Survey Bull. 25 9 78 p., 2 p1s. 1 Mallory, W. W., 1971, The Eagle Valley Evaporite, northwest Colorado--A regional. synthesis: U. S. Geol. Survey Bull. 1311 -E, 37 p., 3 pls.

Mallory, W. W., Post, E. V., Ruane, P. J., Lehabeck, W. L., and Stotel .aeyer, R. Be, 1966, Mineral, resources of-the Flat Tops primitive area, Colo- rado: U. S. Geol, Survey Sull..3230-C, 30 p., 2 pls.

Mu=ray D. R., ed., 1974, Guidebook to the energy resources of the Piceance Creek basin--Rocky Hountain Association of Geologists Field Conference, 25th, Denver, Colorado, 1974: Deaver, Colo., Rocky Mtn. Assoc. Geolo- Sists, 303 p.

Richardson, G. Be, 1907, The Book Cliffs coalfield, between Grand River, Colorado, and Sannyside, Utah: U. S. Geol. Survey Bull. 316-E, p. 302-320.

( r5j 1909, Reconnaissance of the Book Cliffs coalfield, between Grand ^I River, Colorado, and Sunnyside, Utah: U. S. Geol. Survey Bull. 371, 54 p., 4 pls. r

-=_ SELECTED REFERENCES ON GILPIN COUNTY MINERAL RESOURCES

Baillie, W. N., 1962, Silver in Colorado: Colorado School Mines Mineral. Indus- tries Bull., V. 5; no. 5,• 18 p.

Bastin, E. S., and Hill, J. M., 1917, Economic g eology of Gil pin Coounun ty and adjacent parts of Clear Creek and Boulder Counties, Colorado: U. S. Geol. Survey Prof. Paper 94, 379 p., 10 pis.

Braddock, . W. A., 1969, Geology of the Empire quadrangle, Grand, Gilpin, and Clear Creek Counties, Colorado: U. S. Geol. Survey Prof. Paper 616, 56 p., -^ 3 pis. _. Drake, A. A., Jr., 1957, Geology of the Wood and East Calhoun mines, Central City district, Gilpin County, Colorado: U. S. Geol. Survey Bull. 1032-C, 41 p., 4 pis.

^ e. Lovering, T. 5., and Goddard, E. X., 1950, Geology and ore deposits of the Front Range, Colorado: U. S. Geol, Survey Prof. Paper 223, 319 p., 30 pis.

E.' Moeneh, R. H., and Drake, A. A., Jr., 1966, Economic geology of the Idaho Springs district, Clear Creek and Gilpin Counties, Colorado: U. S. Geol. Survey Bull.. 1208, 91 p., 3 pis. i _ Moore, F. B., and Butler, C. R., •1952, Pitchblende deposits at the Wood and Calhoun mines, Central City mining district, Gilpin County, Colorado: 4 U. S. Geol. Survey Circ. 186, 8 p., 3 pis. Sharps, T. I., 1963, Lead and zinc in Colorado: Colorado School Mines Mineral 1 Industries Bull., v. 6, no. 6, 15 p.

1965a, Tungsten in Colorado: Colorado School Mines Mineral Industries Bull*, V. 8, no. 5, 16 p. w t 1965b, Sulfur deposits of Colorado: Colorado School Mines Mineral Industries Bull.., v. 8, no. 6, 8 p.

iI Sims, P. K., Drake, A. A., Jr., and Tooker, E. W., 1963, Economic geology of the Central City district, Gilpin County, Colorado: U. S. Geol. Survey Prof. Paper 359, 231 p., 12 p1s.

i.^ Sims, P. K., Osterwald, F. W., and Tooker, E. W., 1955, Uranium deposits in the Eureka Gulch area, Central City district, Gilpin County, Colorado: U. S. Geol.. Survey Bull. 1032-A, 31 p., 1 pl. Sims, P. K., and others, 1963, Geology of uranium and associated ore deposits, ' central part of the Front Range mineral belt, Colorado: U. S. Geol. Survey Prof. Paper 371, 139 p., 9 p1s.

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.a 1 .1 SELECTED REFERENCES ON GRAND COL'I3TY MINERAL RESOURCES

Braddock, W. A., 1969, Geology of the Empire quadrangle, Grand, Gilpin, and Clear Creek Counties, Colorado: U. S. Gebl. Survey Prof. Paper 616, 56 p., 3 pls.

Grout, F. F., Worcester, P. G., and Henderson, Junius, 1913, Reconnaissance of the. geology of. the Rabbit Ears region, Routts Grand, and Jackson Counties, Colorado: Colorado Geol. Survey Bull. 5. pt. 1, 57 p.

Kinney, D. It., Izett, G. A., Kin-, R. U., and Taylor, R. B., 1968, The Poison Ridge volcanic center and related mineralization, Grand and Jackson Counties, Colorado: U. S. Geol. Survey Circ. 594, 8 p.

Laveriug, T. S., and Goddard, E. N., 1950, Geology and ore deposits of the • Front Range, Colorado; U. S. Geol..Survey Prof. Paper 223, 319 p., 30 pls.

o1i SELECTED REFERENCES ON GUNNISON COUNTY MINERAL RESOURCES

Baillies W. No,, 1962a, Feldspar occurrences in Colorado: Colorado School Hines Mineral. Industries Bull., v.' 5p . 4o. 40 lZ p L 1962bi SLIver in Colorado: Colorado School-Mines Mineral Industries Bull., v. S O no. 5..18 P. f T. Balser, Carl, 1956, Tungsten potential in Chaffee, Fremont ', Gunnison, Lake, Larimer, Park, and Summit Counties, - Colo.: U. S o Bur. Hines Inf. Circ. 7748, 31 p.

Crawford, R. Do& and Worcester, P. G., 1916, Geology and ore deposits of the Gold Brick district, Colorado: Colorado Geol. Survey Bull. 10, 116 *3 pls.

Dings, _ M. Go and Robinson, C. S o 1951, Geology and ore deposits of the Gar- field quadrqnsle, Colorado.*, U. S o Geol. Survey Prof. Paper 289, 110 p., f 13 p1s.

Harder, E. Cop 1909, The Taylor Peak and Whitepine iron-ore deposits, Colorado: U. S.. Geol. Survey Bull. 380-E. p. 188-198.

HMO J. M., 1909, Notes an the economic geology of southeastern Gunnison.Cdunty, Colorado: U. S. Geol. Survey Bull.. 380-A, p. 21-40.

Hunter J. F., 1914, The Aberdeen granite quarry near Gunnison, Colorado: U. So Geol. Survey Bull. 540-K, p. 3597362.

Joliison, V. H., 1948, Geology of the Paonia coal field, Delta and Gunnison Yi Counties., Colorado: Ui, S. . Gaol. Survey Coal lAve Nap.

Leep W..T., 1912, Coal. fields of Grand Mesa and the , Colorado: U. S. Geol. Survey Bull. 510, 237 p., 1 pl.

KcUlLan, R. R., 1956, Brown Derby pegmatites,* Gunnison County, Colo.: U. So Bur. Mines Rept. Lair. 5204, 21 p. r Do Olson, J. C., Itedlund, C. and Hansen s W. R.., 190 Tertiary volcanic attatigraphy in the Powderhorn-Blacle. Canyonxegion, Gunnison and 'Montrose Counties, Colorado: U. So Geol. Survey Bull. 1251-C, 29 pop I pl.

01sons Jq. C., and Millace, S. R., 1156, Thorium and rare-earth minerals in Powderharn district, Gunnison Couuntnty, Colorado: U^. S. Geol. Survey Bull. 1027-0, 28 2 pls.

Sharps,' T I., 1962. Colorado mica: Colorado School Mines Mineral Industries Sull e p Ve 5 1, no. 1 9 15 po in 1961, :Lead and tine Colorado.s. Colorado School Mines Mineral Industries Bull. O v. 6, no 6 9 15 -2-

Sharps, T. I., 1965a,. Sulfur deposits of Colorado: Colorado School Mines Mineral Industries Bull., v. 8, do. 6, 8 p.

- 1965b, Tungsten in'Colorado: Colorado school Dines Mineral Indus- = ` ! tries Bull., V. 8, U09 , 5 6 16 p. A Toenges,: A..L.,-Turnbull. L. A., Davis, J.-D., and Reynolds>.=n. A., 1947, Investigataa of the coal deposits-in the Coal Greek district, Gunnison County, Colo.--Progress report 1: U. S. Bur. Mines Rapt. Inv.. 4104, 20 p.

Toenges,A..L. Tuxubull, L..A., Davis, J. D.,. Reynolds , D. A., Parks, B. `C.., ^ Cooper, R. N., and Abernethy, R. F., 1952, Coal deposit, Coal Creek district, Gunnison, County,,Colo.---Reserves, coking properties, and Petro- graphic and chemical characteristics: U. S, Bur. Mines Bull. 501, 83 p. -

Vanderwilt, J. W., 1938, Geology and mineral deposits of the Snowmass Moun- tain area, Gunnison County, Colorado: U. S. Geol. Survey Bull. 884, 184 .p., .1. ;1

Wilson, S. R., and Young, W. A, 1953, Investigation of the New Anniversary- Bucky pe gmatite, Gunnison County, Colo.:' U. S Bur. Mines Rapt. Inv. 4939,..7 p. ". Worcester' P. G.,_ 1919, Molybdenum deposits of Colorado, with general notes on tliejwlybdenum industry: Colorado Geol. Survey Bull. 14, 131 p., 2 pis.

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SE 2CTED REFERENCES ON HINSDALE COURT'L'Y MINERAL RESOURCES

7-illie, W. N..., 1962, Silver in Colorado: Colorado School Mines Mineral Indus-. tries Bull., v 5 'no: 5, 18 p.

- Burbank, W. S., and Luedke, R. G., 1969, Geology and ore deposits of the Eureka , .:. and adjoining districts, San Juan Nlountatns,.Colorado: U. S. Geol. Survey Prof. Paper 535, 73 p., 8 p1s.

Fischer, R. P., Luedke, R. G., Sheridan, M. J. and Raabe, R. G., 1968, Mineral resources of the Uncompahgre primitive area, Colorado: "U. S. Geoll'. Survey Bull, 1261-C, 9.1 p., 3 p1s. Irving,. J. D., and Bancroft, Howland, 1911, Geology and are deposits near Lake' City, Colorado: U. S. Geol. Survey Bull. 478, 328 p., 5 p1s. Larsen, E. S., 1911, The economic geology of Carson camp, Hinsdale County, Colo- redo: II. S. Geol. Survey Bull 470-B, p. 30--38. o U. 1913, Alunite is the San Cristobal quadrangle, Colorado: . U. S. Geol. Survey Bull. 530., p. 17.9-183. a ^^ Sharps, T. f., 1963, Lead and zinc in Colorado: Colorado School Mines Mineral Industries Bull., v. 6j no. G, 15 p. # 'I l Steven, T. A., Schmitt, L. J., Jr., Sheridan, No J., and Williams, F. E., 1969, Mineral resources of the San .Yuan primitive area, Colorado, with a section r _ on iron resources on the Irving Formation: U. S. Geol. Survey Bull. 1261-F, s 167 p., 2 pls.

Worcester, P. G., 1919, MoZybdeaum deposits of Colorado, with general notes on the molybdenum industry: Colorado Geol. Survey Bull. 14, 131 p., 2 pls,

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S Beekly, A. L., 1915, Geology and coal resources of North Park, Colorado: U. S. Geol. Survey Bull.. 596., 121 p., 1 pl.4 Grout,. F. F., Worcester, * P. G., and Henderson, Junius, 1413, Reconnaissance of the geology of the Rabbit Ears region, Routt, Grand, and Jackson " Counties, Colorado. Colorado Geol,. Survey Bull. 5. 0 pt. 1 9 57 p.

_ Kinney, D. M., Izett, G. A., King, R. U., and Taylor, R. B.,, 1968, The Poison. Ridge volcanic center and related mineralization, Grand and Jackson CbUaties, Colorado: U. S. Gecl. Survey Cite. 59.4„ S.0.

^.. Lowering T. S.,.and Goddard, E. N., 1950, Geology and ore deposits of the Front Range, Colorado: U.. S. Geol. Survey, Prof; Paper 223, 319 p., 30 pls. Speltz, C. N., 1974, Strippable coal resources of Colorado--Location, tonnage, and characteristics: U. S.. Bur.. Mines Prelim. RQpt. 195, 6$ p. Steven, T. A., 1960, Geology and fluorspar deposits, Northgate district, Colorado: U. S. Geol. Survey Bull. 1082-F, 99 p., 4 pls.

Warne, J. D. 1947,, Northgate fluorspar, Jackson County, Colorado: U. S. -. But. Nines &ept: Inv. :4106,"23 p.

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- ;h Bird o- A. G., 1956, Primary pitchblende deposits at the Ralston Creek Mine, Uranium llag. , vol. 3, no. 8.

1957, Uranium deposits in Golden .Gate Canyon and Ralston Creek area of Jefferson - County, Colorado, . Mines Mag.., vol. 47, no. 3.

Chase, G. H., and °McConaghy; J. A. 1972., Generalized surficial geologic map of the Denver area., Colorado: U. S. Geol.. Survey Misc. Geol.. Inv. Map 1-731.

Emmons, S. F., Cross,. Whitman, and Eldridge, G. E., 1896., Geology of the . Denver. Basin is Colorado: Q. S Geol. Surveyy Mon. 27, 556P .^ 5 Pls. Goldstein, E. H., 1957, Geology of the Dakota Formation Uranite Deposit near Morrison, Colorado, Economic . Geology v. 52, no. 7. 1974b, Atlas of sand., gravel, and quarry aggregate resources, Colorado Front Range Counties: Colorado Geol. Survey Spec. Pub. 5-B, 212 P. Z Sharps, T. I., 1962, Colorado miSac Colorado School Mines Mineral Industries Bull., v. I no. I, 15 p. Sheridan, D. M., Maxwell, C. H., and Albee, A. L., 1967, Geology and uranium deposits of the Ralston Buttes district, Jefferson County, Colorado, with sections oa Paleozoic and younger sedimentary rocks by Richard Van Horn: u U. S. Geol. Survey Prof. Paper 520, 121 p., 8.p1s. Sims, P. K., and Sheridan, D. M., 1964,.Geology of uranium deposits is the L Front Range., Colorado: U. S. Geol. Survey Bull. 1159, 116 p., 5 pls. Soule, J. H., 1960, Mining methods and costs, Schwartzwalder uranium mine, Jefferson County, Colo.: U. S. Bur. Mines Inf. Circ. 7963, 24 p._

Trimble, D. E., and Fitch, R. R., 1974, Map showing potential sources of gravel and crushed-rock aggregate in the Greater Denver area, Front u Range Urban Corridor, Colorado: U. S. Geol. Survey Misc. Geol. Inv. Map I-856--A.

Woodmansee, W. C., 1959, Geology and ore deposits of the Schwartzwalder •

• SELECTED REFERENCES ON LAKE COUNTY VaNERAL RESOURCES

BaillieOW, N., 1962, Silver in Colorado: Colorado School Mines Mineral Industries Bull., v. 5, no. 5, 18 p.,

Behre, C. H., Jr., 1953, Geology and ore deposits of the west slope of the • , Colorado . : U. S. Geol. Survey Prof. Paper 235, 176 p:, 20 pls. Ll- Belser,.Carl, 1956, Tungsten potential in-Chaffee, Fremont, Gunnison, Lake, _ Larimer, Park, and Summit Counties:, Colo.: U. S. Bur. Mines Inf. Circ. 7748, 31 p.. Butler, B. S., and Vonderwilt, J. W., 1933, The Climax molybdenum deposit,, -, Colorado, with a section on history, production, metallurgy, and devel- opment by C. W. Sanderson: U. S. Geol. Survey Bull. 846-C, 42 p.; 3 pls.

Darnell, R. P., 1970, Silver potential and economic aspects of the Leadville. district, Lake County, Colo.: U. S. Bur. :Sines Inf. Circ. 8464, 105 p. Ebbley, N. E., rr., and Schumacher, J. 1., 1949, Investigation of the Fair- view Hill area manganese deposits, Leadville, Lake County, Colo.: U. S.. Bur. Mines Rept. Inv. 4589, 18 p. Emmons, S. F. 18$6, Geology and, mining industry of Leadville, Colo., with atlas: V. S.. Geol. Survey Mon. 12, 770 p., 35 pis.

Emmons , S.. F., Irving, J. D., and Loughlin, G. F., 1927., Geology and ore deposits of the Leadville mining district, Colorado: U. S. Geol. Survey Prof. Paper 148, 368 p.

Hedges,: J. M.,. 1940, Mineral industries surveys of the United States- -Colorado, Lake County.. possibilities of manganese production at Leadville, Colo.: - U. S. Bur. Mines Iaf. Circ. 7125`, 23 p. Howell, J. V,, 1919,. of Colorado: Colorado Geol. Survey ^ i. Bull. 17, I08 p., 2_p1s.

I. Lovering, T. S.., and Goddard. n E. N., 1950, Geology and are deposits of the Front Range, Colorado.: II. S. Geol. Survey Prof. Paper 223, 319 p., 30 pls..

Pierson, C. T..,. and Singewald,.Q. D., 1954, Occurrences of uranium-bearing minerals in the St. Kevin district, Lake . County, Colorado: U. S. Geol. Survey Circ. 321, 17 p.

Sharps, T. I., 1963, Lead and zinc in Colorado: Colorado School . Mi.nes Mineral Industries Bull., v 6, no; 6,:15 P. ^ I f9.65a:, Sulfur deposits of Colorado: Colorado School Mines Mineral Industries Bull., v. 8, no. 6, 8 p. _ V

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Sharps, T. I., 1965b, Tungsten in Colorado: Colorado School Mines Mineral Industries Bull., v. 8., no. 5, 16 p.

Singewald, Q. D., 1955, Sugar Loaf and St. Kevin mining districts, Lake County, Colorado: U. S. Geol. Syrvey Bull. 1027-E, 50 p., 2 pls.

L Vanderwilt, J. W., 1932, Preliminary geologic notes on Galena Mountain, I a part of Soowmass area, Colorado, Colorado Sci. Soc. Proc. vol. 13, no. 1. Wideman F. L. 1957 A reconnaissance of sulfur resources in Wyoming, Colorado, Utah, New Mexico, and Arizona: U. S. Bur. Mines INf. Circ. 7770, 61 p.

1 Ul Worcester, P. G., 1919, Molybdenum deposits of Colorado, with general notes on the molybdenum industry: Colorado Geol. Survey Bull. 14, 131 pl. 2 p1s.

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SELECTED REFERENCES ON LA PLATA COUNTY MINERAL RESOURCES

Baillie,,W. N., 1962, Silver in Colorado: Colorado School Mines Mineral L Industries Bull., v. 5 6 no. 5, 18 p.

Barnes, H., Geology of the Ignacio area, Ignacio and Pagosa Springs Quads, L to Plata and Archuleta. Counties, Colorado, USGS Oil and Gas Invest. Map OM-138. Barnes, H., et al., Geology and fuel resources of the Red Mesa area, La Plata U_ and Montezuma Counties, Colorado, USGS Oil and Gas.Invest. Map OM-149.. Cross, W., et al., 1899, La Plata Folio, USGS Geologic Folio 60.

Eckel, E. B., 1949, Geology and ore deposits of the La Plata district, Colorado: V. S. Geol. Survey Prof. Paper 219, 179 p.

F. M. Fox and Associates, 1974, Reconnaissance engineering geology report for Planning District 9, State of Colorado: Colorado Geol. Survey Environmental Geology Rept. 4, 36 p., 1 pl.

Gardner, J. H., 1909, The coal field between Durango, Colorado, and Monero, New Mexico: U. S. Geol. Survey Bull. 341-C, p. 352-363.

U- Schafer, P. A., 1945, Ore minerals of the , Colorado, compared with other Telluride Districts, Economic Geology, vol. 40, no. 3.

Shaler, M. K., 1907, A reconnaissance survey of the western part of the Durango- Gallup coal field of Colorado and New Mexico: U. S. Geol. Survey Bull. 316-F, p. 375-426.

Shaler, M. K., and Gardner, J. H., 1907, Clay deposits of the western part of the Durango-Gallup coal field of Colorado and New Mexico: G. S. Geol. L Survey Bull. 315-I, p. 296-•302. Speltz, C. N., 1974, Strippable coal resources of Colorado -- Location, tonnage, f and characteristics.: U.. S. Bur. Mines Prelim. Rept. 195, 68 p. Steven, T. A. Schmitt., L. J., Jr., Sheridan, M. J., and Williams, F. E., 1969, Mineral resources of the San Juan primitive area, Colorado, with a section c - on iron resources of the Irving Formation: U. S. Geol. Survey Bull. 1261-F, 187 p:., 2 pls.

Taff, J. A., 1907, The Durango coal district, Colorado: U. S. Geol, Survey Bull. 316-E, p. 321-337.

Wanek, A. A., 1959, Geology and fuel resources of the Mesa Verde area, Montezuma and La Plata Counties, Colorado: U. S. Geol. Survey Bull. 1072-M, 54 p., 3 pls. Worcester, P. G., 1919, Molybdenum deposits of Colorado, with general, notes on the molybdenumY industry:Y Colorado Geol. SurveyY Bull. 14. 131 p. 2P 1s. c 1

SELECTED REFERENCES ON LARIIMER COUNTY MINERAL RESOURCES

Baillie,j% N., 1962, Feldspar occurrences in Colorado: Colorado School Mines Mineral Industries Bull., v. 5, no. 4, 12 p. j Rain, G. W., 1950, Mineralized localization in the Treasure Mountain granite, Colorado, GSA Bull., vol. 61, no. 12.

TT Selser, Carl, 1956, Tungsten potential in Chaffee, Fremont, Gunnison, Lake, Larimer, Park, and Summit Counties, Colo.: U. S. Bur. Mines Inf. Circ. L^ 7748, 31 p.

Gilkey, M. M., 1960, Hyatt Ranch pegmatite, Larimer County,. Colo.: U. S. 4^. Bur. Mines Rept. Inv. 5643, 18 p.. Lowering, T. S., and Goddard, E. N., 1950, Geology and ore deposits of the u Front Range, Colorado: U. S. Geol. Survey Prof. Paper 223, 319 p., 30_pls.. Martin, G. C., 1909, The Niobrara limestone of northern Colorado as a possible source of Portland cement material: U. S: Geol. Survey Bull. 380-.I, u p. 314-326.

1910, Coal of the Denver Basin, Colorado: U. S. Geol. Survey Bull. 381 C, p. 297-3061. J Sehwochow, S. D., Shroba, R. R., and Wicklein, P. C., 1974a, Sand, gravel, and quarry aggregate resources,.Colorado Front Range Counties: Colorado Geol. Survey Spec. Pub. 5--A, 43 p., 3 pls.

1974b, Atlas of sand, gravel, and quarry aggregate resources, Colorado Front Range Counties: Colorado Geol. Survey Spec. Pub.-5-B, 212 p1s.

Sharps, T. 1., 1962, Colorado mica.: Colorado School Mines Mineral Industries Bull., v. 5, no. 1, 15 p.

1965, Tungsten in Colorado: Colorado School. Mines Mineral Industries Bulle , V. a, no. 5, 16 p. Sims, P. K., Phair, George, and I:oench, R. H., 1958, Geology of the Copper_ King uranium mine, Larimer County, Colorado: U.S. Geol. Survey Bull.. 1032-D, 53 p., 3 pis.

Thurston, W. R., 1950, Exploration of the Buckhorn Mica Mine, Larimer Co., Colorado,. USGS Report Open File, no. 59. 1951., Exploration of the Big Boulder Prospect, Latimer Co., Colorado, USES Tem. Report 106. 1955, Pegmatites of the Crystal Mountain district, Larimer County, Colorado: U. S. Geol. Survey Bull. 1011, 185 p., 13 pls. R^ - 2 -

Van 2andt, P. C., 1928, Colorado Portland Cement Company new dry process plant -- ^l Boettcher, Colo., plant proof that a dry plant can be built to have all the advantages of the wet-process plant: Rock Products, v. 31, no. 13, p. 42-59.

Worcester, P. G., 1919, Molybdenum deposits of Colorado, with general notes on the molybdenum industry: Colorado Geol. Survey Bull. 14, 131 p., 2 p1s.

Tyant, D. G. 1951, Treasure Hill area, Larimer County, Colorado,-USES Temti Report 9B.

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` SELECTED REFEMCES Ott MIiM&kL COUNTY MIHEUL RESOURCES

i Baillie, W. N., 1362, Silver in Colorado: Colorado School Mines Mineral Indus- tries Bull., v. 5, no. 5, 18 p. Emmons, W. 8:, and Larsen, E. S., 1913, A preliminary report on the geology and are deposits of Creede, Colorado: U. S. Geol. Survey Bull. 530, p. 42- 65.

U' 1923, Geology and ore deposit's of the Creede district, Colorado: U. s. r Geol. Survey Bull. 718, 198 p., 2 pls. Larsen, E. S., 1913, Alunite in the San Cristobal quadrangle, Colorado: U. S. Geol. Survey Bull. 530, p. 179-153.

L Larsen, E. S., and Hunter, J. F., 1913, Two sulphur deposits in Mineral County, Colorado: U. S. Geol. Survey Bull., 530, p. 363-369. Heaves, S. C., amd Darnell, R. P., 1968, Study of the silver potential, Creede district Mineral Count.y, Colorado: U. S. Bur. Mines Inf. Circ. 8370, 58

Sharps, T. I., 1963, Lead and zinc in Colorado: Colorado School :sines Mineral Industries Hull:, v. 6, no. 6, 15 p. 1965, Sulfur deposits of Colorado: Colorado School b1ines Mineral Indus- tries Bull., v. 8, no. 6, 8 p.

Steven, T. A., Schmitt, L. J., Jr., Sheridan, M. J., and Williams, F. E., 1969, Mineral resources of the San Juan primitive area, Colorado, with a section on iron resources as the Irving Formation: U. S. Geol. Survey Bull. 1261--F, 187 p., 2 pLs. U Wideman ^ P. L. s.1957 sA reconnaissance of sulfur resources in WyY oming,$^ Colorado, Utah, New Mexico, and Arizona: U. S. Bur. Mines Inf. Circ. 7770, 61 p. .• tu..xx..m.•.

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SELECTED REFERENCES ON MONTROSE COU&TY 11INERAL RESOURCES p

I Coffin, R. C., 192L, Rad:U=, uranium, -and vanadium deposits of southwestern Colorado: . Colorado Geol. Survey Bull. 16, 231 p., 3 pls.

Fischer, R. P., 1944, Simlified" geologic map of the vanadium region of south- western Colorado and southeastern Utah: U. S. Geol. Survey Strategic , r Minerals Inv."Map 3-226. Fischer,'R. P., and Hilpert, L. S., 1952, Geology of the Uravan mineral belt: U. S. Geol. Survey Bola.. 988.A, 13 p., 3 pas.

_ r Gott, G. B., and Erickson, R. L., 1952, Reconnaissance of uranium and copper deposits in parts of New ktexico, Colorado, Utah, Idaho, and Wyoming: U. S. Geol. Survey CLrc. 219. 16 p. x F; Holmes, R. W., and Harrer, C. M., 1952, Investigation of the Colorado Copper is Co. properties, Mesa and Hantrose Counties, Colo.: U. S. Bur. Mines. Rept. Inv. 4869, 11 p. -

T Olson, J. C., Hedlund, D. C., and Hansen, W. R., 1968, Tertiary volcanos stratigraphy in the powderhorn-Black Canyon region, Gunnison and Montrose Countyies, Colorado: U. S. Geol. Survey Bull. 1231--C, 29 p., 1 pl.

Speltz, C. N., 1974, Strippable coal resources of Colorado--Location, tonnage,

f and characteristics: U. S. Bur. Mines Prelim. Rept. 195, 68 p.

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SELECTED REFERENCES ON OURAY COUNTY MINERAL RESOURCES

Baillie, W. N., 1962, Silver in Colorado: Colorado School Mines Mineral Industries Bull., v. 5, no. 5, 18 p.

i Belser, Carl, 195.6, Tungsten potential.in the San Juan area -- Ouray, San Juan, and San Miguel Counties, Colo.: U. S. Bur. Mines INf. Circ. 7731, 18 p.

Burbank. W. S., 1933, Vein systems of the Arrastre Basin and regional geologic structure in the, Silverton. and Telluride Quads, Colorado, Colorado Sci. Soc. Proc. vol. 13, no. 5. -

Burbank, W. S., and Luedke, R. G., 1969, Geology and ore deposits of the Eureka and adjoining districts, San Juan Mountains, Colorado: U. S. Geol. Survey Ur Prof. Paper 535, 73 p., 8 pls. Cross,. We, et a1., 1907, Ouray Folio, USES Geologic Folio 153. Deshayes, E. V., and Young, W. E., 1948, Camp Bird lead-zinc deposits, Ouray County, Colorado: U. S. Bur. Mines.Rept. Inv._4230, 19 p.

Fischer, R. P., Luedke, R. G., Sheridan; M. J., and Raabe, R. G., 1968, Mineral resources of the Uncompahgre primitive area, Colorado: U. S. Geol. Survey Bull. 1261-C, 91 p., 3 p1s.

f Hazen, S. W., Jr., 1949, Lead- zinc -silver in the Poughkeepsie district and part of the Upper Uncompahgre and Mineral Point districts, Ouray and San Juan Counties, Colo: U. S. Bur. Mines Rept. Inv. 4508, 110 p.

Kelly, V. Co. 1946, Stages and epochs of mineralization in the San Juan Mountains, Colorado, as shown by the Dunmore Mime, Ouray County, Colorado, Economic Geology, vol. 41, no. 2.

E KWg, W. 5., and Allsman, P. T., 1950, .Reconnaissance of metal mining in the San Juan Region, Ouray, San Juan and San Miguel Counties, Colorado, USBM Information Circe 7554. Ransoms, F. L., 1901, A report on the economic geology of the Silverton quad- rangles Colorado: U. S. Geol. Survey Bull. 182j 265 p•, 7 pla.

1 Sharps, T. I,, 3963.,. Lead and zinc in Colorado: Colorado School clines Mineral Industries Bull., v. 6, no. 6, 15 p. 1965a, Tungsten in Colorado: Colorado School Mines Mineral Industries Bear., , v 8, no. 5, 16 p.

x: 1965b n Sulfur deposits of Colorado: Colorado School Mines Mineral Industries Bull.., v. 8, no. 6, S p.

Wideman, F. L., 1957, A reconra ssance of sulfur resources in Wyoming, Colorado, Utah, New Mexico, and Arizona: U.S.'Bur..Mines Inf. Ciro. 7770, 63 p.

Worcester, P. G., 1919, MolybdenumY depositsP of Colorado , with general notes . an the molybdenum industry: Colorado Geol. Survey Bull.. 14, 131 p., 2 pls. {

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SELECTED REFERENCES ON PART: COUNTY MINERAL RESOURCES

Baillie, W. N., 1962a, Feldspar occurrences in Colorado: Colorado School Mires Mineral Industries Bull,, v. 5, no. 4, 12 p. 1962b, Silver in Colorado: Colorado School Mines Mineral Industries Bull., v, 5, no. 5, 18 p.

Belser, Carl, 1956, Tungsten potential in Chaffee, Fremont, Gunnison, Lake, Latimer, Park, and Summit Counties, Colo.: U. S. Bur. :Mines Inf. Circ. 7748, 31 p. Guiteras, J. R., 1940, Mining and milling methods and costs in the Alma district, Colorado: U. S. Bur. Mines Inf. Circ. 7101, 63 p.

1- Hawley, C. C., 1969, Geology andberyllium deposits of the Lake George (or Badger Flats) beryllium area, Park and Jefferson Counties, Colorado: U. $. Geol. Survey Prof. Paper 608-A, 44 p., 4 pls. Hawley, C. C., and Griffitts, W. R., 1968, Distribution of beryllium, tin, and • tungsten in the Lake George. area, Colorado: U. S. Geol. Survey Circ. 597, 18 P.

Lovering, T. S., and Goddard, E. N., 1950, Geology and ore deposits of the Front I ' Range, Colorado: U. S. Geol. Survey Prof. Paper 223, 319 p., 30 p1s.

Mu3leuburg, G. A., 1925, Geology of the Tarryall district, Park County, Colorado: (?F Colorado Geol. Survey Bull. 31, 64 p., 1 pl. Patton, H. B., Hoskin, A.-J., and Butler, C. M., 1912, Geology and ore deposits of the Alma district, Park County, Colorado: Colorado Geol. Survey Bull. tJ 3, 284,p., 3 pls. Pierson, C. T., and Singewald, Q. D., 1953, Results of reconnaissance for radio- active minerals in parts of the Alma district, Park County, Colorado: U. S. Geol. Survey Circ. 294, 9 p., 1 pl. Sharps, T. I., 1962, Colorado mica: Colorado School dines Mineral Industries Bull., V. 5, no. 1, 15 P. 1963, Lead and zinc in Colorado: Colorado School Mines Mineral Iadus- tries Bull., v. 6, no. 6, 15 p. I965, Tungsten in Colorado: Colorado School Mines Mineral Industries Bull.., V. 8, no. 5, 16 p. Singewala, Q. D., 1942, Stratigraphy, structure, and mineralization in the BeaverTarryall area, Park County, Colorado: U. S. Geol. Survey Bull. 928-A, 44 p., 3 pis. jr

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Singewald, Q. D., 1950, Cold placers and their geologic environment in north- western Park County, Colorado: U. S. Geol. Survey Bull. 955-D, 69 p. r 6 p}s. 1 Singewald. Q. D., and Butler, B. S., 1941, Ore deposits in the vicinity of the London fault of Colorado: V. S. Geol. Survey Bull. 911 0 74 p., 8 pla. s , 1931, Preliminary report on the geology of and the -; Russia Mine, Park County, Colorado, Colorado Sci. Soc. Proc., vol. 12, _ no. 12. Speltz, C. N., 1974, Strippable coal resources of Colorado- -Location, tonnage, and characteristics; U. S. Bur. Mines Prelim. Rept. 195, 68 p.

Washburne, C. W., 1910, The South Park coalfield, Colorado: U. S. Geol. Survey ^.. Bull. 381-C, P. 307-316.

Wilmarth; V. R., 1959, Geology of the Garo uranium -vanadium copper deposit, F Park County, Colorado: U. S. Geol. Survey Ball. 1087-A. 21 p.., 5 pls. Worcester, P. G., 1919, Molybdenum deposits of Colorado, with general noV"s on the molybdenum industry: Colorado Geol. Survey Bull. 14, 131 p., 2 pis.

SELECTED REFERENCES ON PITKIN COUNTY MINERAL RESOURCES

Daillie, W N., 1962, Silver in Colorado: Colorado School Mines Mineral Industries Bull., v. 5, no. 5, 18 p.. Lt Harder, E. C., 1909, The Taylor Peak and Whitepine iron-ore deposits, Colorado: U. S. Geol. Survey Bull. 380-E, p. 188-198.

Mallory, W. W., 1971, The Eagle Valley Evaporite, northwest Colorado--A regional synthesis: U. S. Geol. Survey Bull. 1311- -E, 37 p., 3 pls.

Sharps, T. I., 1963, Lead and zinc in Colorado: Colorado_ School Mines Mineral _ Industries Bull., V. 6, no. 6, 15 P.

k Spurr, J. E., 1898 9 Geology of the Aspen mining district, Colorado, with atlas: U. S. Geol. Survey Lion. 31, 260 p., 30 p1s.

Worcester, P. G., 1919, Molybdenum deposits of Colorado, with general notes on the molybdenum industry: Colorado Geol. Survey Bull. 14, 131 p., 2 pls.

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4 SELECTED REFERENCES ON ROUTT . COL*NTY MINERAL RESOURCES

Bass, No W., 1954, Geology and mineral fuels of Mount Harris, Pilot Knob, Elkhart Creek and Daton Peak quadrangles, Routt and Moffat Counties, Colorado: U. S o Geol. Survey open-file rept.

Bass, N o W., Eby, J. B., and Campbell, M. R., 1955, Geology and mineral fuels o Of parts of Routt and 11offat. Counties,.Colorado: U. S Geol. Survey ^• Bull. 1027-D, 107-p. of Campbell, X. R., 1923, The Twentymile Park district the Yampa coalfield, Routt County, Colorado: U. S o Cool. Survey Bull. 748, 82 p., 1 pl.

Crawford, R. D., Willson, K. M., and Perini, V. C., 1920, Some anticlines of Routt County, Colorado: Colorado Geol. Survey Bull. 23, 61 p., 3 pls.,

Fenneman, N o Mo., and Cale, H. So, 1906., The Yampa coalfield, Routt County, Colorado, with a chapter on the character and use of the Yampa coals: U. S o Geol. Survey Bull. 297, 96 p., 3 pls.

Gale, Ho So. 1908A, Gold placer deposits near Lay, Routt County, Colorado. U. S o Geol. Survey Bull. 340-A, p. 84-95.

1908b, Carnotite and associated minerals in western Routt County: U. S o Geol. Survey Bull. 340-C le p. 257-262.

To1909, Coal fields of northwestera Colorado and northeastern Utah: U. Geol. Survey Bull. 341-C, P. 283-315.

Grout, F. F., Worcester, P. G.,.and Henderson, Junius, 1913, Reconnaissance of the geology of the Rabbit Ears region, Routt, Grand, and Jackson Counties, Colorado: Colsirado Geol. Survey Bull. 5,.pt. 1, 57 p.

Mallory, W. W., 1971, The Eagle Valley Evaporite, northwest Colorado--A regional synthesis: U. S o Geol. Survey Bull. 1311-E. 37 p., 3 pis.

Spelti, C. No, 1974, Strippable coal resources of Colorado —Location, tonnage, and characteristics: U. S o But. Mines Prelim. Rept. 195, 68 p.

Worcester, P. G. j,1919, Molybdenum deposits ofColorado, with general notes on the molybden= industry: Colorado Geol. Survey Bull. 14, 131 p., 2 p1s. SELECTED REF"E.U.XCES ON SAGUACHE COn. TY KILNERAL RESOU I CES

Bil -illie.. W. N., 1962, Silver in Col orado: Colorado School Mines Mineral Indus- tries Bull., N• - 5. no. 5. 18 PO'

Burbank W. 9., 1932, Geology and ore deposits of the Bonanza mining district, coicrado, with a section on history and production by C. W. Henderson: U. S. Geol. Survey Prof. Pape' 169, 166 p., 4 pls.

Patton, K. B., 1915, Geology and ore deposits of the Bonanza districc $ Saguache County, Colorado: Colorado Geol. Survey Bull. 9, 136 p., 2 pls.

Sharps, T. 1., 1963, Lead and zinc in Colorado: Colorado School Mines Mineral Industries Bull., v. 6, no. 6, 15 p^. 1965, Tungsten in Colorado: Colorado School Mines Mineral Industries Bull., ve S. no. 5. 16 P.

Slebenthal, C. E., 1910, Geology and water resources of the San Luis Valley, Colorado: U. S. Geol. Survey Water-Supply Paper 240, 128 p. Worcester, P. G., 1919., Molybdenum deposits of Colorado, with general notes on the molybdenum industry: Colorado Geol. Survey Bull. 14, 131 p., 2 pls.

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SELECTED REFERENCES ON SAN JUAN COUNTY MINERAL RESOURCES

Atwood, W. W. and Mather, K. F. 1932, Physiography and quaternary geology of the Ian Juan Mtns., USES Prof. Paper 166.

5 Baillie, W. N., 1962, Silver in Colorado: Colorado School. Mines Mineral ludustries Bull., v. 5, no. ' 5, 18 p. Bastin, E. S., 1923, Silver enrichment in the Sari Juan Mountains, Colorado, .

I " USGS Bull. 735-D. Bejuar, W., 1949, Lithologic controls of ore deposits in the San Juan Mtns., Colorado, Compass, vol. 26, no. 2. Balser, Carl, 1956, Tungsten pocential in the San Juan area -- Ouray, San Juan, and San Miguel Counties, Colo,: U. S. Bur. Mines Inf. Circ. 7731, 18 p. ;E' w Burbank, W. S., 2951, The Sunnyside, Ross Basin, and Bonita Fault systems nd their associated ore deposits, San Juan Co., Colorado, Colorado Sci. Soc. Proc., vol. 15, no. 7.

's a Burbank, W. S., and Luedke, R. G., 1969, Geology and ore deposits of the Eureka i and adjoining districts, San Juan Mountains, Colorado: U. S. Geol. Survey i Prof. Paper 535, 73 p., 8 pls. j Cross, W., and Larsen, E. S., 1935, A brief review of the geology of the San Juan region of southwestern Colorado, USGS Bull. 843. I Fischer, R. P., Luedke, R. C., Sheridan, M. J., and Raabe, R. G., 1968, Mineral resources of the Uncompahgre primitive area, Colorado: U. S. Geol. Survey Bull. 1261-C, 91 p., 3 pas. Fe M. Fox and AssacLates, 1974, Reconnaissance engineering geology report for Planning District 9, State of Colorado: Colorado Geol. Survey Eaviron- mental Geology Rept. 4, 36 p., 1 pl.

Hazen, S. W., Jr., 1949, Lead- zinc-silver in the Poughkeepsie district and part of the Upper Uncompahgre and Mineral Point districts, Ouray and San Juan Counties, Colo.: U. S. Bur. Mines Rept. Inv. 4508, 110 p.

j Mild, J. H., 1959, Exploration of lead-zinc deposits in the Ross Basin-Lake i Como area, San_ Juan Co., Colorado, USBM Report Invest. 5518.

Sing, W. S., and: Mlsman, P. T., 1950, Reconnaissance of metal mining in the San Juan region, Ouray, San Juna, and San Miguel Counties, Colorado, USBM Information Cir. 7554.

Larsen, E. S., and Cross, W. ., 1956, Geology and petrology of the San Juan region, southwestern Colorado, USGS Prof. Paper 258. -2-

Ransoms, PV L., 1901, A report on'the economic geology of the Silverton quad- ran€^ es Colorado: U. S. Geol.Y Survey p.,Bull. 7 p1s. 182, 265 Sharps,- T. I., 1963, Lead and xiac is Colorado:- Colorado school nines Mineral Yndustries Bull., v. 6; ao. 64 15 p.. 1965, Tungsten in Colorado: Colorado School Mines Mineral Industries Bull.', V. 8, , no 5, 16 p .

Steven, T. A., Scott, L. J., Jr., Sheridan, M. J., and Williams, F. E., 1969, Mineral resources of the San Juan prizitive area, Colorado, with a section on iron resources on the Irving Formation: U. S. Geol. Survey Bull. 1261-F, 187 p.,.2 p1s. I Vases, D. J., 1963, Geology and ore deposits of the South Silverton mining area; San Juan County, Colorado: U. S. Geol. Survey Prof. Paper 378-A, 56 p.., 7 pls... Wideman, F. L., 1957, A reconnaissance of sulfur resources in Wyoming, Colorado, Utah, New Mexico, and Arizona: U. S. Bur. Mines Inf.• Circ. 7770, 61 p. Woolsey, L. H., 3907, Lake Fork extension of the Silverton mining area, Colorado: U. S. Geol. Survey Bull. 315-A, p. 26-30. Worcester, P. G., 1919, Molybdenum deposits of Colorado, with general notes on the molybdenum industry: Colorado Geol. Survey Bull. 14, 131 p., 2 pls.

Young, W. E., 1966, Manganese occurrences in the Eureka-Animas Forks areas of the San .Yvan Mountains, San Juan County, Colo.: U. S. Bur. Mines Inf. Circ. 8303, 5Z p.

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SELECTED REFERENCES ON SAN MIGUEL COUNTY MINERAL. RESOURCES

satllie, W. N., 1932, Silver in Colorado: Colorado School Nines Mineral Indus- tries Bull., V. 5, no. 5, 18 p.

Balser, Carl, 1956, Tungsten potential • in the San Juan area---Ouray, San Juan, and San Miguel Counties, Colo.: U. S. Bur. Mines Inf, Circ. 7731, 18 p.

Bush, A. L., Bromfield, C. Si, and Pierson, C. T., 1959, Areal geology of the Placerville quadrangle, San Miguel County, Colorado: U. S. Geol. Survey Bull. 1072-E, 87 p., 3 pis.

Coffin, R. C., 1921, Radium, uranium, and vanadium deposits of southwestern Colorado: Colorado Geol. Survey Bull. 16, 231 p., 3 pis. Fischer, R. P., 1944, Simplified geologic map of the vanadium region of south- western Colorado and southeastern Utah: U. S. Geol. Survey Strategic Minerals Inv. Map 3-226. .Fischer, R. P., an3 Hilpert, L. S.., 1952, Geology of the Uravan mineral belt: U. S. Geoff. Survey Bull. 988 -A, 13 p., 3 pis.

f ° Fischer, R. P., Luedke, R. G., Sheridan, M. J., and Raabe, R. G., 1968, Mineral resources of the Uncompahgre primitive area, Colorado: U. S. Geol. Survey } Bull. 1261-C, 91 p., 3 pis:

'Bess, F. L., 1913, Notes on vanadium deposits near Placerville, Colorado: {• U. Si Geol. Survey Bull. 530, p. 142-156.

King, W. g., and Allsman, P. T., 1950, Reconnaissance of metal mining in the San Juan region, OUray, San Juan and San Miguel Counties, Colorado, USBM Infromation Circ, 7554. } Sharps, T. I., 1963, Lead and zinc in Colorado: Colorado School Mines Mineral Industries Bull., v. 6, no. 6, 15 P. 1965a, Tungsten in Colorado: Colorado School Mines Mineral Industries Bull., v. S. no. 5, 16 p. 1965b, Sulfur deposits of Colorado: Colorado School Mines Mineral Indus- tries Bull., v. 8, no. 6, 8 p. i Speltz, C. N., 1974, Strippable coal resources of Colorado- -Location, tonnage, and characteristics: U. S. Bur. Mines Prelim. Rept. 195, 68 p.

Vhay , J. S. ! Ge1962 Geolo loo gandy mineral resources of the area south of Telluride, Colorado: U. S. Geol. Survey Bull. 1112- G, 101 p., 7 pis.

Wideman, F. L., 1957, A reconnaissance of sulfur resources in Wyoming, Colorado, Utah, New Mexico, and Arizona: U. S. Bur. Mines Inf. Circ. 7770, 61 p.

r.

_ . „ w. rw.. ^ art n ^5 ^,-..s riw. ^.v+ia'^^F19 #aA •..-^ ^ iTtlliamson, D. R., 1961, Guide to Colorado gold de Vol. 4, no. 3, posits, CSM Min. Ind. Bull., WorcesterWorcester, P. G, ^9I9, Molybdenum deposits of Colorado, with general notes on the molybdenum industry: Colorado-Geol. Survey Bull. 14^ 131 ^,^ 2 pls.

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e

SELECTED REFERENCES ON SU: ffT COUNTY MINERAL RESOURCES

I Sail.lie, W. N., 1362, Silver in Colorado: Colorado School Miuc-s Mineral Industries Bull., v. S, no. 5. 18 P.

Belser, Carl, 1956, Tungsten potential in Chaffee, Fremont, Gunnison, Lake, Larimer, Para, and Summit Co:nties, Colo.: U. S. Bur, Mines Inf. Cirec. 7748, 31 p.

Bergandahl, M. H., and Koschmann, A. He 1971, Ore deposits of the Kokomo- Tenmil 1f ,e district, Colorado: U. S. Geol. - Survey Prof. Paper 652, 53 p. 2 pls. Hamilton, W. H., and McLellan, R. R., 1955, Investigation of the Kokomo zinc deposits, Summit County, Colo.: U. S. Bur. Mines Rept. Inv. 5138, 28 p.

Lovering, T. S., 1934, Geology and ore deposits of the Breckenridge mining district, Colorado: U. S. Geol. Survey Prof. Paper 176, 64 p.

Lovering, T. S., and Goddard, E. N., 1950, Geology and ore deposits of the Front Range, Cclorado: U. S. Geol. Survey Prof. Paper 223, 319 p., 30 pls. McCulloch, - R. B. , and Huleab. W. Pe t 1946, Exploration of the - Big•-goun zinc- silver mine, Summit County, Colorado, YJSBM Report Invest. 3884.. L. Neuerburg, G. J., Botinelly, Theodore., and Watterson, J. R., 1974, Molybdenite In the Montezuma district of central Colorado: U. S. Geol. Survey Circ. ^ 704, 21 p. Randall, J. A., 1958, Geology and ore deposits of upper Mayflower Gulch, Summit County Colorado, U SES Open File Report 455. Ransome., F. L., 1911, Geology and ore deposits of the Breckenridge district, Colorado: U. S. Geol. Survey Prof. Paper 75, 187 p., 7 pls.

Sharps, T. I., 1963, Lead and zinc in Colorado: Colorado School Mines Y neral Industries Bull., v. 6, no. 6, 15 P. 1965a, Tungsten In Colorado: Colorado School Piines Mineral Industries Bull., v. 8, no. S. 16 P•. 1965b. Sulphur deposits of Colorado: Colorado School Alines Mineral Industries Bull., v. S. no. 6, 8 p. Singewald. Q. D., 1951, Geology and ore deposits of the upper Blue River area. Sum~:it County, Colorado: U. S. Geol. Survey Bull. 970, 73 p., 7 pls.

TWeto. Ogden, and Bryant, Bruce, 1970, Mineral resources of the Gore Range- Su=it - } Eagles Nest Primitive area and vicinity, Suit and Eagle Counties, °-' Colorado: U. S. Geol. Survey Bull. 1319 - C, 127 p., 2 pls.

7 Viceman, F. L., 1957, A reconnaissance of sulfur resources in Wyoming. Colorado, Utah. New Mexica, and Arizona: U. S. Bur. Mines Inf. Circ e 7770, 61„p.

Worcester, P. G., 1919, Molybdenum deposits of Colorado, with general antes an the molybden= industry: Colorado Gc,^i. Survey Bull. 14, 131 p., 2 pls. f

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fi SELECTED REFERENCES ON TELLER COUNTY =NERAL RESOURCES

Bainie, k'. ti., 1962, Silver in Colorado: Colorado School Mines Mineral Indus- tries Bull., v. 5, no. 5, 18 p. Gott, G. B., McCarthy, J. H., Jr., Van Sickle, G. H., and McHugh, J. B., 1969, Distribution of gold and other metals in the Cripple Creek district. Colo- rado: Us S. Geol. Survey Prof. Paper 625-A, 17 p., 2 pls.

Konselman, A. S., 1940, Mining methods and costs at the South Burns Shaft of Golden Conqueror :fines, Inc., Cripple Creek, Colo.: U. S. Bur. Mines Inf., Circ. 7094. 13 p.

Lindgren. Waldemar, and Ransome, F. L., 1906, Geology and gold deposits of the Cripple Creek district, Colorado: U. S. Geol. Survey Prof. .Paper 54, 516 p.

Levering, T. S., and Goddard, E. N., 1950, Geology and ore deposits of the Front Range, Colorado: U, S. Geol. Survey Prof. Paper 223, 319 p., 30 pls.

Sharps, T. I., 19654, Tungsten in Colorado: Colorado School Mines Mineral Industries Bull., v. 8, no. 5, 16 p.

1965b. Sulfur deposits of Colorado: Colorado School. Mines Mineral

E Industries Bull., v. 8, nos 6 0 8 p. k Worcester, P. G., 1919, :folybdenum deposits of Colorado, with general notes on the i molybdenum industry: Colorado Geol. Survey Bull.. 14, 131 p., 2 pls.

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Behre, C. H., Jr., 1953, Geology and ore deposits of the western slope of the Mosquito 'Range, USGS Prof. Paper 235.

Guiteras, J. R., 1940, Mining and milling in the Alma District, Colorado, USBM IC 7101. C t Klugman, M. A., 1964, Mb/Ca Ratios in Carbonate wall rock in the Alma-Horseshoe . District, Colorado, Am. Inst. Min. Met. and Petro. Eng., Soc. Min. Eng., Tr. voj. 229, no. 2.

Patton, H. B., Hoskin, A. J., and Butler, G. M., 1912, Geology and ore deposits F; of the Alma District, Park Co., Colorado, Colorado Geological Survey, No. 3.

Singewald, Q. D., 1932, Suggestions for prospecting in the Alma District, Colora- do, Cohorado Sci. Soc. Proc., vol. 13, no. 4.

} , 1935, Relations of hydrothermic alternation of porphyries to ore deposition in the Alma District, Colorado, Economic Geology, vol. 30, no. 5.

:..^ Singewald, Q. D., and Butler, B. S., 1930, Preliminary geologic map of the Alma mining district, Colorado, Colorado Sci. Soc. Proc., vol. 12, no. 9.

1936, Structure and mineralization along the London Fault, Colorado, {`i AIMS, Tech. Pub. no. 754.

1941, Ore deposits in the vicinity of the London Fault of Colorado, {E USGS Bulletin 931.

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. ASPEN DISTRICT

Vanderwilt, J. W., 1935, Revision of structure and stratigraphy of the Aspen District, Colorado, Economic Geology, vol. 30, no. 3.. s Volin, M. E., and Hilo, J. H., 1950, Investigation of Smuggler lead-zinc dine Aspen, Pitkin Co., Colorado, USEM Report Invest. 4696. a!

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so 1929, A collapsed dome in the Bonanza mine district, Colorado, Washington Acad. Sci. J., vol. 19, no. 13. Burbank, W. S., 1932, Geology and ore deposits of the Bonanza mining district, USGS Prof. Paper 169. .

Patton, H. B., 1915, Geology and ore deposits of the Bonanza district, Saguache ' Co., Colorado, Colorado Geol. Survey no. 9.

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Y BRECKENRIDGE DISTRIC` f Lovering, J. S., 1934, Geology and ore deposits L district, Colorado, USGS Prof. paper 176..

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CALUMET DISTRICT

Rainwater E. H. 1934, Geology and ore deposits of the Calumet district, Colorado, Gealogical Soc. Am. Proc, For. 1933.,

et al., 1936, Contact ore deposition at the Calumet iron mine, Cdlorado, Economic Geology, vol. 31, no. 8.

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jji ` CARIBOU DISTRICT

King, R. U., 1952, Vein deposits of uranium at the Caribou mine, Boulder Co., Colorado, USGS Tem-13A.

. Moore, F. B., 1952, Pitchblende deposit-at the Caribou mine, Boulder County, ( Colorado, GSA Bulletin, vol. 63, no. 12.

1957, Geology and uranium deposits of the Caribou area, Boulder ^. County, Colorado, USGS Bull..n030-N.

Ridland, G. C., 1949 0 Development and geology at the Caribou mine, Mining Year- book (Colorado Mining Assoc.).

1950, Radioactivity at the Caribou silver mine, Boulder Co., Colorado, Min. Eng., vol. 187, no. 1.

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CENTRAL CITY DISTRICT

Armstrong, F. C., 1952, Pitchblende deposits on Quartz Hill, Central City a -` district., Gilpin Co., Colorado, Economic Geology, Vol. 47, no. 7. Also in GSA Bulletin, vol. 63, no. 12.

Geology of the Wood and East Calhoun Minez, Central City district, Gilpin Co., Colorado, .1957. USGS. Bulletin 1032-C. j

King, R. U,., 1951, Investigations -in the Wood Mine, Colorado, USGS TEK-102 A. +

Moore, F. B., and Butler, C. R., 1952, Pitchblende deposits at the Wood and Cal- _ houn Mines, Central City mining district., Gelpin.Co., Colorado, USGS Circ. 186.

Pitchblende deposits of the Central City .district and the adjoining areas.,. Gilpin and Clear Creek Counties, 1956,. International Conference on peaceful uses of atomic energy, vol. 6. Sims, P. K., 1955, Uranium. deposits in the Eureka Gulch area., Central City district, . Gilpin 'Co., Colorado, 'USGS Bulletin 1032-A. 1956, Paragenesis and structure of pitchblende-bearing veins, Central City district,,. Gilpin Co., Colorado, Economic Geol.. vol. 51, no. 8. 1963, Economic geology of the Central City district, Gelpin Co., Colorado, USGS Prof. Paper 359.

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{E CENTRAL-JAMESTOWN DISTRICT

Goddard, E. N.., 1934, The relation of tertiary intrusives to ore deposition of l Jamestown, Colorado, Geologic Soc. of Washington Proceedings. Also in Washington Academy of Science Jour., vol. 24, no. 2.

, 1946, Fluorspar deposits of the Jamestown District, Boulder Co., Colorado., Colorado Sci. Soc. Proc., vol. 15, no. 1.

, and Glass, J. J., 1937, Deposits of radioactive cerite near James- town, Colorado, American Mineralogist, vol. 25., pps. 381-404.

Hild, J. H., 1949, Investigation of Jamestown fluorite deposits, Boulder County, JL Colorado, USBM Report Invest. 4483.. Phair., George and Kiyoko, 0., 1953, Hydrothermal uranothorite in fluorite c breccias from the Blue Jay Mine, Jamestown, Boulder County, Colorado, USGS T.E Investigation Report 144. u

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``f` Coulter, W. J., 1929, Mining molybdenum ore at Climax, Colorado, Eng. Mining Journal, vol. 127, no. 10. ..A Vanderwilt, J. W., 1933. The molybdenum deposit at-Climax, 16th Internat. Geologic Congress, Guidebook 19.

1942, The occurance and production of molybdenum, Colorado Sch. Mines Quart., vol. 37, no. 4.

1955, Hydrothermal alteration at the Climax molybdenum deposit, Mining Eng., vol. 7, no. 1.

and Butler, B. S., 1933, The Climax molybdenum deposit of Colorado, Colorado Sci. Soc. Proc., vol. 12, no. 10. Also in USGS Bull. 846..

1933, The Climax molybdenum deposit with a section on history, pro- duction, metallurgy, and development by C. W. Henderson, USGS Bulletin 846 C.

Vanderwilt, J. W., and King, R. U., 1946, Geology of the Climax ore body: closely spaced fractures make block caving of the rock possible, Min. and Metals, vol. 27, no. 474.

Wallacej S. R., et al., 1968, Multiple intrusion and mineralization at Climax, Colorado, Ore Deposits in the United Stated, AIME.

;:...i CREEDE DISTRICT

Larsen, E. S., 1923, Geology and ore deposits of the Creede district, Colorado, ..^ USGS Bulletin 718.

I^ Larsen, E. S., 1929, Recent mining developments in the Creede district, . Colorado, USGS Bulletin 811.

Meeves, A. C., and Darnell, R. P., 1968, Study of the silver potential, Creede district, Mineral County, Colorado, USBM Info. Circ. 8370.

I` Steven, T. A., 1965, Geology and structural controls of ore deposition in the ? Creede district, San Juan Mts., Colorado, USGS Prof. Paper 487.

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ti Her s CRIPPLE CREEK DISTRICT

;. Beebe, A. H., and Johnson, C. H., Mining methods and costs at teh Cresson mine, -' Cripple Creek,. Colorado, USBM Info. Circ. 6806, 1934.

Koschmann, A. H., New light on the geology of the Cripple Creek district, Colorado and its practical significance, Co]o. Min. Assoc.. Special Pub., 1941. Koschmann, A..H.,. Structural control of gold deposits.of the Cripple Creek District, Teller Co., Colo., USGS Bull. 955-B, 1949. and Loughlin, G. F., Geology and ore deposits of the Cripple Creek district, Colo., Colo. Sci. Soc. Proc. 13(6), 1935. Lindgren, W. and Ransome, F. L., Geology and gold deposits of the Cripple Creek district, Colo., USGS Prof. Paper 54, 1906. Loughlin, G. F., Ore at deep levels in. the Cripple Creek district, Colo., AIMS Tr., v. 75, 1927. ^f Loughlin, G. F., 'Cripple Creek today, geology of ore deposits, Eng and Min. J. 136(8), Aug., 1935.

E Paragenic study of hypogene gold and silver telluride ores of Cripple .Creek, Colorado, Pan Amer. Geol., vo. 74, 1940.

L? Rickard, T. A., The Telluride ores of Cripple Creek and kalgoorlie, AIMS Tr., v. 30, 1900.

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CRYSTAL MOUNTAINDISTRICT

Thurston, William R., Regmatites of the Crystal Mountain district, Larimer County, Colorado, USGS Bull. 1011, 1955A

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AJ. 'J^ EMPIRE DISTRICT

Tapp, W. N., 1948, Influence of depth on the ore deposits of the North Empire mining district,. Empire, Colorado, , Colorado —Wyoming Acad. Sci. Journ., vol. 3, no. 5. r

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-1.341

,a EUREKA DISTRICT t Young, Wm. E., 1966, Manganese occurences in the Eureka-Animas Forks areas of the San Juan Mountains, San Juan County, Colorado, USBM Info. Circ. 8303. I .:

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GIUMN DIS'T'RICT c' 0., The Emgire Zinc Company s operation at Gilman, Colo., Eng. and Borchardt; W. Min. J., vo. I32, nos. 3 & 6, 1931. 4. Gilman), Min. Eng., v. 5, no. 12, Radabaugh, R. E., Geologg and ore occurence ( 1953.

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..x.314 ]1 , ^ ^ ^ ( '. .: ^^^ 8 .::d -..^;! ..k .,. ...:.t ...-:. ^-^ '.' ...... -.e.,^.iaiF_.4sr..:Y...... ♦..ruui^.3t:5.A"^...::^.^ ..wi.etn^a.^e...:.a..:....uR.^t..a.'^..^"._r^ul^.':

GOLD HILL DISTRICT

Campbell, R. H., Reconnaissance for radioactivity in the Gold Hill mining area, Boulder, Co., Colo., USES Trace Element Mem. Rept., TEM-563A, 1955. 5f

Goddard, E. N., Preliminary Report on the Gold Hill mining district, Boulder County, ' Colorado, Colorado Scientific Society Proc. 14(4), 1940.

Goddard,.E. N.,. Nickel deposit near Gold Hill, Boulder County, Colorado, also ._ T. S. Lovering, USES Bull. 931-0, 1942.

Myers, R. E., The minerals and geology of Gold Hill, Colorado, Rocks and Minerals,. v. 22,: no.. 3,' 1947.

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''. Schlottman, Jerome D., Foothills mine, Idledale district, Jefferson County, Colorado, US At. Energy Comm. [Pub.] RME-138, 1961.

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i A ^a IRWIN• DISTRICT 1

^- Socolow, A. A., 1949, Geology of the Irwin district of Colorado, GSA Bulletin, vol. 60 0 no. 12.

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^ IMM MO DISTRICT

I } Ramilton,jW. H., 1955, Investigation of the Kokomo zinc deposits, Summit County, Colorado, USBM Report Invest. 5138. Koschman, H. R., and Wells, F. G., 1946, Preliminary report on the Kokomo mining district, Summit County, Colorado, Colo. Sci. Soc. Proc., vol. 15, no. 2.

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LA PLATA DISTRICT

Atwood, W. W., and Mather, K. F., Physiogrpahy and quaternary geology of the San Juan Mtn., Colorado, USGS Prof. Pap. 166, 1923.

Resurvey of the geology and ore deposits of the La Plata raining district, Colorado, Colo. Sci. Soc. Proc. 13(9), 1936.

Copper ores of the La Plata district, Colorado, and their platinum content, Colo. Sci. Soc. Proc. 13(12), 1938.

Eckel, E. B., and others, Geology and ore deposits of the La Plata district, Colorado, USES Prof. Pap. 219, 1949.

Galbraith, F. W., Ore minerals of the La Plata Mtns., Colorado compared with other Telluride districts, Econ. Geo., v. 36, 1941..

l! U Ij LAWSON—DUMONT DISTRICT

Harrison, J. E., and L eonard, B. F., Preliminary { Lawson-Dumont district, report on the Jo Re Clear Creek Count Y. area, Colo., USGS Circ. 21133,, 19 52.

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LEADVILLE DISTRICT

i Behre, C. H., 1929 , Revision of structure and stratig-raphy in the Mosquito Range and the Leadville district, Colorado, Colo. Sci. Soc. Proc., vol. 12, no. 3.

^i Behre, C. H., 1939, Preliminary geological report on the west slope of the Mosquito Range in the vicinity of Leadville, Colorado, Colo. Sci. Soc. Proc., vol. 14, no. 2.

UL Chapman, E. P., 1939, Newly recognized features of mineral paragenesis at Lead- ville, Colorado, ADM, Mining Tech., vol. 3, no. 5.

Davidson, R. N., 1950, Hydrothermal alteration effects in the Leadville limestone and their relation to metalization, GSA Bulletin, vol. 61.

Ebbly, N. E., Jr., 1949, Examiniation, trapping, and sampling of mine shafts and underground workings, Leadville, Lake County, Colorado, USBM Report Invest. 4518.

and Schumaker, J. F., 1949, Investigation of the Fairview Hill area manganese deposits, Leadville, Lake County, Colorado, USBM Report Invest. 4589: L' Elgin, R. A., et a1., 1949,. x The Leadville drainage tunnel, Lake County, Colorado, USBM Report Invest. 4493. nr U1 r, Emmons, S. F., 1927, Geology and ore deposits of the Leadville mining district, Colorado, USGS Prof. Paper 148. l fFr Hedges, J. H., 1940, Possibilities of manganese production at Leadvill, Colorado, USBM Infor. Circ. 7125.

Loughlin, G. F., 1918, The oxidized zinc ores of Leadville, Colorado, USGS Bull. 681.

i 1926, Guides to ore in the Leadville mining district, Colorado, USGS Bulletin 779.

i and Behre, C. H., 1934, Zoning of ore deposits in and adjoining the Leadville district, Colorado, Economic Geology, vol. 29, no. 3.

Meeves, H..,: and `Darnell, R. P., 1970, Silver potential and economic aspects of the Leadville District, Colorado, USBM Info. Circ. 8464. IJ) Salsbury, M. H., 1956, The Leadville drainage tunnel second project, Lake MAGNOLIA DISTRICT

Wilkerson, A. S., Geology and ore deposits of the Magnolia mining district and adjafent area, Boulder County, Colorado, Colo. Sci. Soc. Pro. 14(3), 1939. i Telluride-tungsten mineralization of the Magnolia mining district, L; Colorado, Econ. Geo. 34(4), 1939.

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i- MARSHALL PASS DISTRICT

Malan, R. C., 1959, Geology and uranium deposits of the Marshall Pass District, Gunnison, Saguache, and Chaffee Counties, Colorado, address at Colorado Mining Assoc., Denver, Colorado.

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MINERAL POINT DISTRICT

-A L Hazen, S. W., Jr., 1949, Lead-zinc in the Poughkeepsie district, part of the upper Uncompahgre and Mineral Point districts, Ouray and San Juan Counties, Colo., - USBM Report Invest. 4508. ti.

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^ k '-= MONARCH DISTRICT F Crawford, R. D., 1909, Preliminary report on the geology of Monarch mining district, Chaffee County, Colorado, Colorado Geologic Survey, no. 1.

.,.1913, Geology and ore deposit's of the Monarch and Tomichi districts, Colorado, Colorado Geol. Seer., no. 4. Gabelman, J. W., 1950, Structural control of limestone alteration in the U1. Monarch mining district., Colorado, GSA Bulletin, vol. 61, no. 12. Hazen, S. W., Jr., 1956, Exploration for lead and zinc at the Madonna mine, ' Monarch mining district, Chaffee County, Colorado, USBM Report Invest. 5218.

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' MONTEZUMA DISTRICT

- Patton, H. B., 1918, The Montezuma mining district, Summit County, Colorado, Colorado Geologic Survey, no. 18.

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NORTHGATE DISTRICT

L ' Steven, T. A., 1950, Age and structural control of the floursgar deposits in the Northgate District, Colorado, GSA Bulletin, vol. 61, no. 12.

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r 1 ^I OURAY• DISTRICT i

Burbank, W. S., Revision of geologic structure and stratigraphy in the Ouray district of Colorado and its bearing on ore deposits., Colo. r^ Sci. Soc. Proc. 12(6), 1930:. r Moehlman, R. - S., Ore deposition south of Ouray, Coloardo, Part'II, Econ. - Geo. 31(4,5), 1936.

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i PLACERVILLE DISTRICT

Hatt, John C., Petrology of two clastic dikes from the Placerville district, Colo., Am. J. Sci. 242(4), April, 1944. Eischer, R. P., and others, Vanadium deposits near Placerville, San Miguel.Co., Colorado, Colo. Sci. Soc. Pr., vol. 5, no. 3, 1947.

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POUGHKEEPSIE DISTRICT

^f t . EOWDERHORN DISTRICT s Olson, J. C., and Wallace, S. R., 1956, Thorium and rare earth minerals in the Powderhorn district, Gunnison County, Colorado; USGS Bull. 1027-0.

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^ . $taatz, E., and Trites, A. F., 1957, Geology of the Quartz Creek pegmatite district, Gunnison County, Colorado, USGS Prof. Paper 265.

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3 .. L^ !w^ t,.. RED CLIFF DISTRICT

'. Crawford., R. D., and Gibson, R., Geology and ore deposits of the Red Cliff 3 : District, Colo., Colo. Geo.. Survey, Bull 30, 1925.

Means, R., Geology and ore deposits of Red Cliff, Colo., Econ. Geo., v. 10, 1915.

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Collins, 6. -E., Localization of ore bodies at Rico and Red Mtn.. Colo. as conditioned by geologic structure and history, Colo. Sci. Soc. Proc. 12(12), 1931.

Cross, W. and Ransome, F. L., Rico Folio, USGS Geologic Folio, 130, 1905.

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r ^ _ _ V SILVERTON DISTRICT

Cross, W.; et al., Silverton folio, Geological Folio 120, 1905.

k Varnes, David J., Geology and ore deposits of the south Silverton mining area, SAn Juan-Co., Colo., O'SGS Prof. Pap. 378-A, 1963.

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I i Shawe, D. R., Geology and uranium-vanadium deposits of the Slick Rock district, '. ^.. San Miguel and Dolores Co., Colo., Inter. Conf. Peace, Uses At. Energy, t 2nd Geneva Proceeding, v. Z, 1958.• Shaw, D. R., Heavy minerals as guides to uranium-vanadium ore deposits in the Slick Rock district, Col6., also Howard E. Bowers, USGS Bull.. 1167-B, 1961:

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} ^ . ! . aNEFFELS DISTRICT

Burbank,S., Structural control of ore depositionn i the Red Mt., Sneffels, ! . and Telluride districts of the San Jan Xtns., Colo., Colo. Sci, Soc.

Pro., v. l4, no. 5, 1941. . . ( -

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/ . SMMITVILLE DISTRICT j

deposits of the Platoro-Summitville mining Patton, H^ B., Geology and ore _J district, Colo., Colo. Geological Survey, Bull. 13, 1917. i 1 Steven, Thomas A., Geology and ore deposits of the Summitville district, San Juan Mtns., Colo., USES Prof. Pap'. 343, 1960.

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_ 4 TARRYALL DISTRICT

} 3 l Mu3.lenburg, G. A., 1925, Geology o€.the Tarryall district, Park County, Colorado, Colo. Geol. Surv. 31. r i a

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TELLURIDE DISTRICT

2 Burbank,. W. S.., Structural control of ore deposition in the Red. Mtn.,. Sneffels, and Telluride districts of the San Juan Mtsn., Colo., Colo. Set. Soc. y Prot., v. 14, no. S, 1941. y

A .;: Vhay, J. S., Geology and mineral deposits of the area south of Telluride, r Cato., USES Bull. 11:12 -G, 3962.

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r r^` • TINCUP DISTRICT

t^ 6• Goddard, E. N., 1936, The geology and ore deposits of the Tincup mining district, Gunnifson County, Colorado, Colorado Sci. Soc. Proc., vol. 13, no. 10. z _^f

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Crawford, R D., 1913, Geology and ore deposits v£ the Mon arch and Tom3 bi \districts, Colo., Colo. Geol. Sur. 4. } \

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TUNGSTEN DISTRICT

Kirk, C. T., 1916, Tungsten district of Boulder County, Colorado, Mining and Science Press, vol. 112, no. 22. f Lowering, T. S., and Tweto, 0., 1953, Geology and ore deposits of the Boulder i County Tungsten district, Colorado, USES Prof. Paper 245.

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TWIN LAKES DISTRICT Ij Howell, J. D., 1919, Twin bakes district of Colorado, Colo. Geol. Sur. 17. sa

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UNCO"AHGRE DISTRICT

Burbank, W. S., 1940, Structural control of ore deposition in the Uncompahgre district, Ouray County, Colorado, USGS Bull. 906-E.

Fisher, R. P., Luedke, P. G., Sheridan, M. J., and Raabe, R. G., 1968, Mineral resources of the Uncompahgre primitive area, Colo., GSB, 1261-C.

Hazen, S. W., Jr., 1949, Lead-zinc-silver in the Poughkeepsie district and part of the upper Uncompahgre and Mineral Point district, Ouray and San Juan Counties, Colorado, USBM Report Invest. 4508.

Kelly, V. C., 1946, Geology, ore deposits, and mines of the Mineral Point, Poughkeepsie, and upper Uncompahgre districts, Ouray, San Juan, and Hinsdale Counties, Colorado, Colorado Sci. Soc. Proc., vol. 14, no. 7. q ti ^a Y:

URAVAN DISTRICT

Boardman,3R. L., Sedimentary features of upper sandstone lenses of the salt ! wash member and their relation to uranium-vanadium deposits in the Uravan district,. Montrose County, Colo., International Conf. Peace Uses of At. Energy Gen., V. G., 1955.

ki Bot.inelly, T., and Weeks, A., Mineralogic classification of uranium-vanadium deposits of the Colorado Plateau, USGS Bull. ' 1074-A, 1957.

Ei Fischer, R. P., Geology of the Uravan mineral belt, USGS Bull. 988-A, 1952. Fischer, R. P., and Hilpert, L. S., Geology of the Uravan mineral district, _ USGS Bull. 988-A, 1952.

Heyl, A:. V., Zoning of the Bitter Creek vanadium -uranium deposit near Uravan, Colo., USGS Bull 1042-F, 1957. Wood, H. A., and Lekas, M. A., Uranium deposits of the Uravan mineral belt, --^ Intermountain Assoc. of Pet. Geologists, 9th Ann..-Conf., pp. 208-215, 1958.

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WARD DISTRICT

Wahlstromj E. E., The age relations of the Ward ores, Boulder County, q Colorado, Econ. Geo. 31(1), 1936.

Walker,. Stanley M., Ore Deposition in the Columbia and Dew Drop vein systems, Ward district, Boulder County, Colorado, Engineers Bull. (Colo. Soc. Eng.) 10(6,7), 1935.

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§ :( ^\U.4 s § y .\ WESTON PAS DISTRICT aƒ \ { : $ ne#ze, C. s., The Weston Pis mining district, fake and Park Counties, Colo,, S Colo. S i. Soc. floc., v. 13, no. 3. ^ \ ^

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Map showing areas covered by Bibliographies on Geology, published by the Colorado School of Mines. I--Area covered by present bibliography, "3 1], no.4, Iq2& —4--Northcentral Colorado, C. S. M. Quarterly, Vol. 22, No. 4. Oct. 1927. K —2--Northwestern Colorado, C. S. M. Quarterly, Vol. 21, No. 3, July 1925 , x( S—Northeastern Colorado, C. S. M. Circular Information, .fan. 1925.K — 3--Southwestern Colorado, C. S. M. Circular information, Sept. 1924. —B—Southeastern Colorado, C. S. M. Circular Information, Aug. 1925.x`

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