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James Doyle Sell Mining Collection

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MT. PERKINS QUADRANGLE x10~:i" • ARIZONA-NEVADA ,~ M~Nu-r~ SER~S ITOPOGRAP.~C~

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To: J.D. Sell

From: F.R. Koutz

Sec. 32, 33, T27N, R21W Gold Bug District Mohave County, AZ

I attach an ERS, set of 16 Au-Ag assays (TAJ-481), sample-field notes and sample map (1:62,500) of the Liberty Mine. The Liberty Mine area is a hemat~tic color anomaly which was noted from a hill top SW of the Gold Bug-Mohave Mines I mile to the south. The Liberty Mine color anomaly is I mile SE to 2 miles SSE of the Van Deemen property with some +2.2 m.t. of 0.042 opt Au and presently being extension/fill-in drilled by Arizona Star Resources (VSE) partner of Fischer-Watt Gold Co. The hoistman at the Gold Bug Mine said that the Liberty had been reverse-circulation drilled by Freeport (Reno) several years ago.

The ERS and field notes are fairly self-explanatory. The Liberty Mine area consists of Precambrian mica schists, granitic to dioritic gneiss, all with loca] pegmatite-aplite dikes all locally strongly fo]iated (generally NE- strike, dips 20-80 ° NW). The schists have all been obviously folded--some isoc]inally although there ~s considerable stump, contortion and drag. There are a few apparently Mid-Late Tertiary andesitic to rhyo]itic dikes in the area. The area has only recently been unroofed from upper plate Patsy Mine Volcanics (mostly andesitic flows and flow breccias I mile to the NW at Van Deeman. There must be significant NE-striking fault between Liberty and Van Deeman as the low-angle Patsy Mine lower fault contact is 400-800' below the tops of the higher hills around the Liberty, Mohave and Gold Bug Mines.

The Liberty is part of another set of stacked synthetic ]istric fault systems (mapped and drilled by Heidrick and Wilkens among others) with local antithetic and orthogonal high angle offsets and mineralization feeders. The Liberty Mine itself is in a fault breccia with minor UG production from flat slopes where intersected by higher-angle feeders. Values across several feet of structure ranged up to 18-40 ppm Au and 38 ppm Ag. Values from Freeport drill cuttings ran <.02-.2 ppm Au.

The BLM microfiche indicated that Freeport had some 60+ "Liberty" claims in 1983, but dropped them in December 1985. They were subsequently refiled by Chuck and Margie Kunkes. I contacted the Freeport geologist, Alan Morran, who confirmed that Freeport had returned the claims to the Kunkes, the underlying claimants who have picked up most of the nearby countryside including Van Deemen in the last 10-15 years. Freeport staked because the previous claims were in disarray. The Kunkes' have since learned enough exploration/mining vocabulary "to be dangerous." J. D. Sell June 3, I~87 / Page 2

I Freeport drilled +22 RDH (RC) in the property in 1985. They hit a number of discontinuous .OX opt AU (mostly <.05 opt) and a few 5-I0' zones of 0.1 opt Au near to low-high angle breccia intersections. In the field it appeared that many RDH were preferentially sited near high-angle structures. Unfortunately, below the oxidation level (±IOO') values dropped off sharply and there was little dissemination away from structure, Freeport also spent considerable time mapping the area and collected several 1OO geochem samples, analyzed for a number of elements. Silver, arsenic and molybdenum were particularly anomalous among other elements. There is a 1000' x 1000' As anomally that halos Au mineralization. Freeport confirmed that there was a good relationship between the more mafic metamorphics and gold mineralization, but the gold is probably genetically related to Mid-Tertiary Volcanism-intrusives and faulting. Freeport thought the drill results were discouraging. Freeport gave a complete set of data to the Kunkes including geologic mapping.

It appears that the Liberty Mine is a poorly developed distal end of the Van Deemen system and the best targets have been tested. The Fischer-Watt people have obviously looked at the Liberty data and probably do not want it at Kunkes' price. However, it is worth obtaining the data for the record/ educationa] purposes. The Kunkes have other "good looking" ground not under option. The Kunkes are presently on vacation, but I will stop by and look at what they have sometime this summer.

FRK:mek F. R. Koutz Attachments: ERS Sample Map Field/Sample Notes Assays TAJ-481

• , / Chuck & Margie Kunkes RECORD Box 1652 ASARCO EXPLORATION Dolan Springs, AZ 86441 I~] FIELD EXAMINATION [7 LITERATURE SEARCH El ASARCO FILE 602-767-3831 Section I General Indexinq Gold Bug Dist. (~ Name(s) of Property or. Area i(~)Country Mohave Co. (~ sto,eA r arPmvtn=, I zona LIBERTY MINE USGS Ouad. ' , ~) Rio or Gore (Golden Age - 1936): Mt. Perkins-15J ,a. ~) Latitude ' ~)Longitude ~) AMS Sheet Towmhip Range 'Section ~)SxominedW F. R. Kou tz I~ o°,, 32, ! 5/7/87 35°42'N 114°32'N Kingman 27N 21W 33 ~o,lae I([~~.,d Do~, Tucson I 6 hours Section !1 Sources of Information Date Typed 6'/1 7 "~ References • Authgr Date Title Publications Vol, No, Wilkens, J. 1984 Arizona Geol.Soc. FaIl Field Trip Guidebook (Day I +1979 Map) Gardner, E.D. 1936 Au Mine + Mill, Black Mtas; USGM IC 6901 p. 57 Fischer-Watt Gold + AZ Star Res.(Prospectus 6/30/86) Van Deemen Property I mi.NW Section lliAppraisal USGS PP-374E, 1963 C.R. Longwel 1 ~Recommendations ~ I Detachment + Production Poet Producer L~ Listric Fits Commodity Tans Grade O ACt|On Now O Au ore X00 .X opt ~ TOo Law Grade Producer ~] Geologic Conolpt Too Smo,,/Spott G M|nor=l Depoett ~, Geochem Anomaly O Otenershlp Problem ~-~ ACce88 Problem ~ Proepect Geophy Anomaly ~. 'Reserves FreeDort-Rer~Relict Paten ~0b~a~n Drill X~ Dril]ed 198~ in District ~ommodlty Tone Grode ~.m.or,,~,eo 22+ (?) ~)E=oo~o,,oa.Sev.shafts to None ~,To~tr~t=g.(4000'+-?) "I000' Workings 100' ~O Spectra. Analysis Attached " ~)~Assays Attached TAJ-481 ~ [] Geochem Results Attached

Section IV Geologic Data O CommodityorCX~toinedMemls AuO_Ag (Reported As+Mo anomal .) Ore Minerals-Major Au-Ag M inor Py Tcpy-CuOx Minor N. (~)HostRocks-Mojor Qtz-Mus-schist gr-gneiss diorite schMi~or felsic/r~afic• ClIKeS Patsyto Mine Vol Age of Host Rocks p(~ +pegs(pE) pE mT? 18.6 - 14.5 m. (!~ Nature of Exposures Good: Desert pediment + low hills, fair to good outcrop (schist is slumped). 200-400' relief. Pegmatites plus felsic and mafic dikes locally lace area Al~ration Bleaching-sericite plus hematitic flooding-silicification along structures mad color an Much of mafics locally chloritized @TolalExtenlHvy color anom:2:8OO'x500', Halo ~l~mi ®Structure WNW to NNW IOto30°NE low angle shears(detachment-related) with NW& ±NE high angle listric normal faults. Foliation in schist rolls alot. OreOccurr~celn low angle struct, plus intersecting/feeding higher angle struct. Heavy bleaching/hem.flooding usually limited to <10' structure. Spotty. Best Freeport results: 5-10' of 0.1 opt Au in a few D.H. ~AgeofMinerolizolionpost14.5my,pre11.gmy (faulting) ~nclusions~Recornmendetiens A short distance into footwall of l istric fault system. Not as well developed as VanDeemen. Considerable areas of fresh-looking schist/gneiss between shear zones are probably waste. Low angle/high angle shears may coalesce at shallow depth but mostly stacked listric-normal faults in Dist. rather than master detachment Worth-obtaining Freeport's sampling/drill data plus Kunkes has other zones in district not held by Fischer-Watt. "1936,USBM: I-6' 25 ° vein: av. 3', ore bunchy, 125'drift in vein-small shipments" Au values drop sharply I~elow nY;~;~_ 7nnp (±100 deoth~. (~roddltionol'spoceuseext~ shee~} ~rm Rmvi~ed~lun~ l~O-,IJ4.~ MVW-~ SKYLINE LABS, INC. 1775 W. Sahuaro Dr. • P.O. Box 50106 Tucson, Arizona 85703 (602) 622-4836 PRELIMINARY REPORT OF ANALYSIS

JOB NO, TAJ 481 May 28> 1987 BI"I"'I TO LIB-15 SI"tII:tMENT NO,: BH & LIB PAGE 1 OF I ASARCO INCORPORATED Attni Mr, l:"lee~wood R, l

Analysis o.(." 16 Rock Chip Sav,ples

A u Ag ITEM SAMPLE NO, (ppm) (ppt.~)

" ...... -- ...... -- ...... -- "-- " -- ...... 7" ......

,5 L.IB-I ,09 ,8 6 LIB'-2 , 02 < , 2 7 t..tB-3 ,29 18,0 8 LIB-"4 < , 0~2 < , 2 9 I_IB-,=i ,32. 55,0

10 LIB'"6A ,93 34 , 0 I I I_IB"'6B < , 02 ,2 12 LIB-7 4,2(} 18,0 13 LIB--8 ,4f.I 8,8 14 LIB-9 6, O0 38,0

15 LtB-1 0 >11] ,00" 32,0 .16 L I B-'.I. '! ,20 ,2 17 I_IB-'I 2 ,05 ,2 18 LIB- 1 "..3 ( ,02 ,.4 19 LIB"-"}. 4 ,03 ,2

20 LIB,".I 5 1,50 3. l)

•x-NOl'E, Greater than normal, geochemical range, A Please advise :i..P .Fire assay is needed,

NOTE: Gold> Silver and Platinum results pending,

CC I Asarco Inc orp ora't'ed Sou't'hwes~ern Exploration P,O, Box 5'747 Tucson> Arizona 85703 tj 7 Attn,, Mr, James D, Sell Ms, Mary Kavanagl~

()harles E. Thompson William L Lehmbeck James A. Martin Arizona Registered Assayer No. 9427 Arizona Registered Assayer NO. 9425 Arizona Registered Assayer No. 11122 SKYLINE LABS, INC. 1775 W. Sahuaro Dr. • P.O. Box 50106 Tucson, Arizona 85703 J (602) 622-4836 Z REI:~OR1" OF" ANALYSIS

JOB NO, TAJ 481 June 5 ~ 1987 BH-1 TO L..IB-15 SHIPMENT NO.: BH & LIB PAGE "I OF 2 ASARCO INCORPORATED At~n' Mr, Fleetwood R, Koutz Southwestern Exploration P,O. Box 5747 ASARC0 Incorporateo • Tucson, Arizona 85703 JUN 8 1987 Analysis o£ 14 Rock Chips and 6 Drill Cuttings SW Expbration;

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5 LIB-I .09 ,8 6 LIB-~! ,02 < , 2 7 LIB-3 ,29 18,0 8 L.IB-4 < , 02 < , 2 9 LIB-5 ,32 55,0

I0 LIB-6A ,93 34,0 1 1 LIB-6B < . 07~. . 2 12 LIB-7 4.20 18,'0 13 LIB"-8 ,40 8.8 14 LIB-9 6 , 00 38 ,0

15 L.IB-I 0 >I0,00" 32.0 I & LIB"'I I ,2.0 , 17 LIB-1 ,.." , 05 , 2 18 I_IB-'I 3 < ,02 ,4 19 I..IB-I4 ,03 ,2

20 LIB-I 5 1,50 3,0

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k ASARCO Southwestern Exploration Division ,-/b5 June 4, 1987

F.R. Koutz

Liberty Mine Gold Bug District Mohave County, AZ

Your memo and ERS has been received and distributed to New York.

In dealing with the Kunkes and other Liberty type deposits, it is well to secure as much data as possible without any further obligation other than friendship and a few more samples added to their inventory.

Although you mention "stacked" systems, it is not apparent as to the closeness of the stacked systems, either the flatfish zones or the high- angled listric systems, which constitute such a situation. I would hope that you will soon be able to project such zones that will enhance the probability of better values distributed over a viable area.

As is becoming apparent, it is necessary to have a feeder system coming into the structurally prepared flattish-listric in order to secure the necessary grades of ore, and, of course, the size for open-pit potential. Again, such footwall features might be evident but need to be projected into the necessary structurally prepared system.

If the Van Deemen area is a lower part of a stacked system which involves the Liberty Mine area, then I would be interested in the valley west of the Liberty Mine where such a lower system may be in suboutcrop.

How do you relate the detachment zone at the Mockingbird Mine with the Liberty and Van Deemen zones?

i .~ James D Sel I JDS:mek

CC: R.L. Brown (w/att. FRK memo) W.L. Kurtz Southwestern Exploration Division

June 4, 1987

J.D. Sell

Liberty Mine (Addendum) G01d Bug District Mohave County, Arizona

Thank you for your comments on my June 3 Liberty Mine memo. Rest assured that I will get as much "free" data out of Kunkes as possible.

I attach several th~ngs that will clear up your questions: "Stratigraphic and Tectonic Setting of the North Central Black Mtns. & Detrital Valley" by Joe Wilkins (1984 AGS Field Trip hand-out to go with guidebook). This shows the style of rotated and laterally transported Tertiary, Laramide and Precambrian sections along a downward-flattening and coalescing syn- thetic listric normal fault system or "stacking." These faults may be offset by orthogonal antithetic faults (Basin and Range age ?). This style is present in detail at a v_ariety of scales.

Note that Heidrick and wilkens mapped (AGS Guidebook) Sec. 28 & 29 N&NW of the Liberty Mine including Van Deemen (but they did few Au-Ag assays).

You are right, it is necessary to determine which systems, directions and projections carry values of viable grade and size. Which level structural]y Liberty or Van Deemen are on is uncertain. The Van Deemen (or another) flat breccia zones (westerly dips) were apparently drilled through under the Liberty Mine flat fault (N7OW, 20-30°NE). Perhaps Freeport's geologic maps and drill sections will show this relationship. But I also know that many of these low angle fault surfaces are themselves folded--so strike and dip are not good criteria to correlate fault surfaces. I have found no good way to tell which high or low angle fault is a feeder (when projected). Intersections of fractures-fissures in fairly competent rock are necessary (= breccia). The ore-grade pods at these intersections are seldom larger than an acre and are difficult to project (and mine-plan).

You are right that the valley to the west of the Liberty Mine is of interest, and, in fact, is part of the Van Deemen Property (attachment), and has been locally drilled by Amselco, Kunkes, Fischer-Watt and others. Freeport held parts of Sec. 31 (and may have also drilled there). Much of the area is apparently so thickly covered with alluvium to preclude an open pit. Beyond the west side line of R21W is Nat. Rec. Area (NPS).

Mockingbird is part of the same flat-fault system that extends under most of the Black Range (and into California) and i~s Van Deemen/Liberty. Which plate or slice Mockingbird is in is impossible to tell at present. I'm not sure that this is a genetically important question to the development of open- pit gold mines here. The relationship to mineralizing Tertiary intrusives is more important.

FRK: mek F. R. K0ut~ Art. (2) /-//ImI0oJ7 ="

STRATIGRAPHIC AND TECTONIC SETTING OF THE NORTH-CENTRAL BLACK MOUNTAINS AND DETRITAL VALLEY,

by Joe Wilkins, Jr. "~'~

INTRODUCTION

The initial mapping in the area (figure I) was a reconnaissance geologic map by Longwell who outlined the general volcanic stratigraphy of the region. Subsequent work by Anderson (1971, 1978) and Anderson and others (1972) have further defined the volcanic stratigraphy and the tectonic setting of the Lake Mead - Eldorado Mountains, Nevada area. A younger " series of flat-lying volcanic and sedimentary rocks which unconformably cap older sequences have been mapped by Longwell (1928, 1963), correlated by Lucchitta (1979) and Blair (1978), and age-dated by Damon (1967, 1979) and Anderson and others (1972).

The majority of the previous geologic studies have been in the Lake Mead and Southeastern Nevada areas. Except for Anderson's (1978) map of the Black Canyon 15" Quadrangle, the only previous work .in the North-central Black Mountains, Detrital Valley and the has been cursory reconnaissance-type surveys.

In 1977 and 1979", during a porphyry copper explora~on program, about 20 square miles in the North-central Black Mountains and White Hills were mapped and sampled and 3 J holes drilled in Detrital Valley. The data acquired form the basis for i the following report and field trip guide.

STRATIGRAPHY

A generalized stratigraphic column showing Longwe~'s (1963) section and Anderson and others' (1972) modification is shown on figure 2. In this portion of Arizona and Nevada there is a minimum of 16,000 feet of volcanic flows, tuffs, tuff breccias and volcanoclastic sedimentary rocks deposited on a Precambrian basement. This volcanic sequence is uncon- formably overlain by 3000 to 5000 feet of late Tertiary to Holocene sedimentary rocks, volcanic flows and tuffs, and alluvium. At least 16,000 feet of Paleozoic and Mesozoic rocks, present on the Colorado Plateau (to the East) and near Las Vegas (to the West) have been removed from this area. ,S%0' ~*00" .41"~0' LINCOLN CO

I

3S* : ]I0'.t L I

I0,11

%

GOLD BASIN ITE HILLS

EXPLANATION

w~

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ConloCt L--- OATMAN UNION PASS High- On9~f foull

1.O1- ¢ngll foull

Tfoflscufr,flf foull .z3 -~mDl~ lile for OQr-do~;'4 rock

,0 ]~) ~0 ,-. 7 7 .....

Figure 1 Regional geological setting and Iocalion map • ~'~ ~;,,I EXPLANATION

• .--. J P, erllhO~ l, hlrl>l~ir.ll .

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Fi gure 2. Generalized stratigraphic section of the volvanic, volcaniclastic and sedimentary rocks in the Detrital Valley and North Central Black Moun- tains, Hohave County, Arizona, -2-

Patsy Mine Volcanics.

The Patsy Mine volcanics, deposited on Precambrian basement and Laramide (?) intrusions, consist of 13,000- 14,000 feet of flows, flow breccias, lahars, vitrophyres, tuffs, tuff breccias and welded tuffs ranging in composition from andesite to rhyolite. Longwell (1963) subdivided the volcanic pile into 2 units: the Patsy Mine and the Golden Door. The original Patsy Mine consisted of about 5000 feet of dark-colored andesite to basalt flows, flow breccias, and lahars with minor pyroclastics. The Golden Door units were a lighter-colored sequence, about 5000 feet thick, and dominantly rhyolite to rhyodacite flows, flow breccias, vitrophyres and tuffs. Anderson (1971) dropped the Golden Door nomenclature, added the units to the Patsy Mine sequence, and subdivided the section as follows:

Lower part - 9100 feet, pyroxene-olivine andesite flows and flow breccias. Middle part - 2700 feet, rhyolite flows and tuffs Upper part - 1500 feet, pyroxene - olivine andesite with rhyodacite at the base.

K-Ar ages for the Patsy Mine range from 18.6 at the base to 14.5 at the top with several discordant ages (22 8, 27.9, 40.8 m.y.) present in lower units (Anderson and others, 1972).

Bridge Spring Tuff.

The Bridge Spring tuff is a 700-foot thick, sheet- like welded rhyolite ashflow tuff that is widespread in the Eldorado Mountains, Nevada, and Chemehuevi Valley, Cali- fornia. It has not been recognized in the central Black Mountains, Arizona. The tuff conformably overlies the Patsy Mine volcanics and was K-Ar dated at 14.5 m.y. (Anderson and others 1972).

Mount Davis Volcanics.

The Mount Davis volcanics include about 2000 feet of flows, flow breccias, and tuffs intercalated with coarse fanglomerates composed of Precambrian gneiss-schist clasts or Precambrian schist-gneiss plus tertiary volcanic clasts. Compositions vary from olivine basalt to andesite with some rhyodacites. The base of the Mount Davis was K-Ar dated at 14.6 m.y. and the top of the sequence dated at 12.0 to 11.8 m.y. (Anderson and others 1972). ~LL

4000'-'~ Tpl Tpm °:";"''~"T"U "Tb ~''''''''~'''' /..."'Tin ,'" " i ! o~o ,., ~4000' _----~_==---._---_-.=_-L-L.__------_.----_-----~"~'L~_..-,~.~~ , .I/ ¢ .7-~. //J i/,:~.."~," TD "'",~. .... --2000' .... -_~ _ _ ~ ...... , ,., , ~, .. ..,, / i, 9i. Y- ~,~-~-~- "-- -- ~-: "> ° - SEA .LEVEL " -~ ~-~ .. -....--____ ~ -- ~---- ~ " ,~" , 1~--" _., I <:.L~ .-~" ~- '--LEVEL

. .._..,--.- 2000' -'J/ ~ --~-~ ~2000' m

EXPLANATION

~'] Alluvium

r~ Mounl Davis Volcanic

[-~ Bridge Spas. Tulf P,'tlsy Mine Volcanfc~

UppP.f

Middlp.

Low~.r

[-~ Schlsl qnni~,;

Figure 3. Cross-Section in the Eldorado Mountain, Nevada After Anderson (1971) -3-

Muddy Creek Formation.

The Muddy Creek formation unconformably overlies (usually with a strong angular unconformity) Mount Davis and Patsy Mine units. The Muddy Creek formation is a valley- .o fill sequence of interfingering fanglomerates, sandstones, shales, siltstones, evaporites, a marine limestone, basalt flows and tuffs. The marine limestone is the limestone member and was assigned marine origin by Blair (1978) on the basis of microfossils and chert geochemistry. K-Ar ages of tuffs and basalt flows in the Hualapai member are 8.4 and 11.9 (Blair, 1978). In Detrital Valley, the Muddy Creek formation has a minimum thickness of at least 2000 feet.

Fortification Hill Basalt.

The Fortification Hill basalt member of the Muddy Creek formation is a series of flat-lying, mesa-capping basalt flows at or near the top of the Muddy Creek formation. Several flows appear to cap gravels (Damon, 1978), and may be younger than the Muddy Creek. A whole rock K-Ar date for the lowermost flow unit on Fortification Hill was 5.88 m.y. and the basalt at Sandy Point yielded a 3.8 m.y. date (Damon, 1979).

TECTONICS

Virtually all of the pre-Muddy Creek lithologies in the North-central Black Mountains, the Whii~e Hills, and Detrital Valley are allochthonous. The sch~t-gne~s basement, the Laramide porphyry copper system, and the Patsy Mine and Mount Davis volcanics all display geologic features which are characteristic of mass transport along high and low-angle normal faults. This style of thin-skinned crustal deformation in an extensional environment was elegantly documented by Anderson (1971) in the Eldorado Mountains, Nevada. The cross-section on figure 3 is Anderson's (1971) East-West section through the Eldorados and graphically illustrat~ the extensional tectonic setting.

Structural Style.

In contrast to detachment-faulted terranes, especially those related to metamorphic cone complexes, (Davis and others, 1980, Reynolds and Rehrig, 1980) there does not appear to be a basal detachment fault (in this area) flooring an extended upper plate sequence. Instead distributed shear along stacked listric normal faults appears to accommodate the crustal stretching. As shown by Anderson (1971) and on figure 3, a 2 km thick section of crustal rocks have been rotated and transported laterally along a series of downward flattening listric normal faults. Detachment-style -4-

faults which are present (as shown on figure 3 and as low- angle normal faults on figure 4) appear to be flat portions of listric normal faults or perhaps earlier listric faults rotated by a later set of listric faults.

The terranes are characterized by moderately to steeply-dipping (occasionally overturned) Patsy Mine and Mr. Davis volcanics. As noted by Anderson (1971) an orthogonal relationship between stratigraphic units and the rotating faults is usually present. That is, the angle between the fault and the bedding attitude of the hanging wall unit is 90 degrees; the steeper the dip the flatter the fault. Brittle deformation, including breccias, megabreccias, anti- thetic and sympathetic high-angle faults and shear zones commonly obscures or obliterates the primary depositional fabric in the volcanic rocks adjacent to the fault plane. The deformation decreases upward, downward, and away from the fault plane. The faults are sinuous structures which trend NNW and consistently dip west. Movement appears to have been S80°W-directed.

Age of Faulting.

The age of faulting, though not directly datable, can be inferred from the ages of the rocks involved and those not involved. Extension began in mid-to-late Patsy Mine time or about 16 to 14 m.y. Extension was in effect prior to Mount Davis time as indicated by cons~ten~y flaker dips in the Mount Davis volcanics compared to the Patsy Mine volcanics. The Mount Davis volcanics and related fan- glomerates are probably a synkinematic sequence common to extensional terranes. For compar~on, in the Whipple-Buckskin Complex, the synkinematic Copper Basin formation ~ cons~ten~y less rotated than the pretectonic Gene Canyon formation (Frost, 1982, Davis and others, 1980).

Extensional tectonism ended following Mt. Davis time and before Muddy Creek time - between 12.0 and 11.9 m.y.

On the A.G.S. field trip (Fall 1984) we will examine several aspects of the stratigraphy and tectonics which are exposed in the Pope Mine Area.

f SLop I Bug

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SCHEMATIC CROSS-SECTION ACROSS DETRITAL VALLEY, MOHAVE COUNTY, ARIZONA Figure 5

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~s PC / z "i I "" ~ "l AVanOeernen Shaft I L • IT~LT~J ,EGE.O I Tertiary volcanics sediments J [~] Precambrian gneiss 8t schist ! •~ ~-~ -_.__u____ Detachment fault; hachures on down dip side. ! N, ! --L. Normal fault;dot on downthrown side Tvs ~' \ • ...=,~ Im Shaft i ! >-" Adil Tunnel I ! 4 .... Roods 31 / 32 33 /- / L~ _,~..zT y Tvs / i I i V APPENDIX E ARIZONA STAR RESOURCE CORR / VAN DEEMEN PROPERTY I BLACK MOUNTAINS / MOHAVE COUNTY, ARIZONA / / GEOLOGY

FEET 0 I000 2000 FEEl" |. I W.G. STEVENSON 8 "IDATE: R21W ASSOCIATES LTD. I MARCH, 1986 "'-T. 44 - 19 20 , 20'2~1

II

s ~ VAN DEEMEN PROPERTY s"

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/

I

~'~" "s 4 IP I i , "r, 30 29 / 29'_8 t / i / T I J 27 ! I N t ,ji / f / / /

LEGEND

l III ... xl~Von Deemen Shaft Shaft .-,.~' ! . /': 1 r----~'.~., AREA COVERED " ', ~. ! I,-:'~:,l'~- I BY APPENDIX J >--- Adil I "i:--F-.-k-P-~z4.c, ! Tunnel

II #~" j ..... Roods

:31 j AREA COVERED.....,""~ m~BY \ 32i33 APPENDIX F ~, ATTACHED I~ " X LtB,~..g 2"'7" IAREA COVERED BY ~APPENDICES K I~ L APPENDIX C

ATTACHED I A RI ZONA STAR RESOURCE CORP. VAN DEEMEN PROPERTY BLACK MOUNTAINS MOHAVE COUNTY, ARIZONA PROPERTY MAP AND OLD WORKINGS

FEET 0 1000 2000 FEET ) I ~W.G. STEVENSON 81 .IOATE: R21W ASSOCIATES LTD. MA'RCH, 1986 Exploration Department Great Basin Division Peter G. Vikre Manager Liberty MineD~ta' Mohave Co., AZ

June 15, 1987

Charles and Marguerite Kunkes Box 1652 Dolan Springs, AZ 86441

Dear Mr. and Mrs. Kunkes:

I talked with Allan Moran of Freeport (Reno) Exploration today and he indicated that he will be sending you directly two (2) complete sets of The Liberty Mine Area data package: One for safekeeping and another for a "Loaner". They would ratherhave you pass out the data than themselves. Mr. Moran indicated it would be a week or so before this copying is completed.

I have sent the three (3) maps I borrowed from you (Geology I" = 500', Liberty Mine Geology I" - 200' and i"= 500' Drill Holes plus IP lines) to Tucson for copying. Our draftsman will return them directly to you. You should also be receiving a copy of ASARCO's 1986 Annual Report and "Metal Magic" - that tells about ASARCO a few years ago.

I will not be in your area until early-mid July, and will contact you before then about getting copies of Geochemistry, soil and sample location maps & assays.

Thank you for your help and hospitality.

Very truly yours,

Fleetwood R. Koutz Geologist S.W. Exploration Division

FRK; mar cc: J.D. Sell ~ /~/~ 4J~ ~-/-~JT~-

ASARCO Incorporated Reno, NV 89502 510 East Plumb Lane (702) 826-7007 i •

Exploration Department Great Basin Division Peter G. Vikre Manager Liberty Mine Data: Mohave Co., AZ

June 15, 1987

Charles and Marguerite Kunkes Box 1652 Dolan Springs, AZ 86441

Dear Mr. and Mrs. Kunkes:

I talked with Allan Moran of Freeport (Reno) Exploration today and he indicated that he will be sending you directly two (2) complete sets of The Liberty Mine Area data package: One for safekeeping and another for a "Loaner". They Would ratherhave you pass out the data than themselves. Mr. Moran indicated it would be a week or so before this copying is completed.

I have sent the three (3) maps I borrowed from you (Geology i" = 500', Liberty Mine Geology i" - 200' and i"= 500' Drill Holes plus IP lines) to Tucson for copying. Our draftsman will return them directly to you. You should also be receiving a copy of ASARCO's 1986 Annual Report and "Metal Magic" - that tells about ASARCO a few years ago.

I will not be in your area until early-mid July, and will contact you ~efore then about getting copies of Geochemistry, soil and sample location maps & assays.

Thank you for your help and hospitality.

Very truly yours,

Fleetwood R. Kout~- Geologist S.W. Exploration Division

FRK; mar ce: J.D. Sell ~ ~'Y~J /~4-~ o/~IfYd~__ d=~.~_~- /g'ff',~o~_/~.~g,:~.~ ~, ,di>~"Uo.~_~1.o

~, . , ~ o/op-t- ~.-----.-T... "-~ " "~ ~-~" ~-~4~.~..T~_

ASARCO Incorporated Fleno, NV 89502 510 East Plumb Lane (702) 026-7007 A, LRCO Southwestern Exploration Division

June 4, 1987

F.R. Koutz

Your memo and ERS has been received and distributed to New York.

In dealing with the Kunkes and other Liberty type deposits, it is well to secure as much data as possible without any further obligation other than friendship and a few more samples added to their inventory.

Although you mention "stacked" systems, it is not apparent as to the closeness of the stacked systems, either the flatfish zones or the high- angled listric systems, which constitute such a situation. I would hope that you will soon be able to project such zones that will enhance the probability of better values distributed over a viable area.

As is becoming apparent, it is necessary to have a feeder system coming into the structurally prepared flattish-listric in order to secure the necessary grades of ore, and, of course, the size for open-pit potential. Again, such footwall features might be evident but need to be projected into the necessary structurally prepared system.

If the Van Deemen area is a lower part of a stacked system which involves the Liberty Mine area, then I would be interested in the valley west of the Liberty Mine where such a lower system may be in suboutcrop.

How do you relate the detachment zone at the Mockingbird Mine with the Liberty and Van Deemen zones?

/f J/James D. Sell JDS:mek

cc: R.L. Brown (w/att. FRK memo) W.L. Kurtz

i • ~ A..qARCO Southwestern Exploration Division

June 3, 1987

To: J.D. Sell

From: F.R. Koutz

Liberty Mine Sec. 32, 33, T27N, R21W Gold Bug District Mohave County, AZ

I attach an ERS, set of 16 Au-Ag assays (TAJ-481), sample-field notes and sample map (1:62,500) of the Liberty Mine. The Liberty Mine area is a hematitic color anomaly which was noted from a hill top SW of the Gold Bug-Mohave Mines I mile to the south. The Liberty Mine color anomaly is I mile SE to 2 miles SSE of the Van Deemen property with some +2.2 m.t. of 0.042 opt Au and presently being extension/fill-in drilled by Arizona Star Resources (VSE) partner of Fischer-Watt Gold Co. The hoistman at the Gold Bug Mine said that the Liberty had been reverse-circulation drilled by Freeport (Reno) several years ago.

The ERS and field notes are fairly self-explanatory. The Liberty Mine area consists of Precambrian mica schists, granitic to dioritic gneiss, all with local pegmatite-aplite dikes all locally strongly foliated (generally NE- strike, dips 20-80 ° NW). The schists have all been obviously folded--some isoclinally although there is considerable stump, contortion and drag. There are a few apparently Mid-Late Tertiary andesitic to rhyolitic dikes in the area. The area has only recently been unroofed from upper plate Patsy Mine Volcanics (mostly andes~tic flows and flow breccias I mile to the NW at Van Deeman. There must be significant NE-striking fault between Liberty and Van Deeman as the low-angle Patsy Mine lower fault contact is 400-800' below the tops of the higher hills around the Liberty, Mohave and Gold Bug Mines.

The Liberty is part of another set of stacked synthetic listric fault systems (mapped and drilled by Heidrick and Wilkens among others) with local antithetic and orthogonal high angle offsets and mineralization feeders. The Liberty Mine itself is in a fault breccia with minor UG production from flat slopes where intersected by higher-angle feeders. Values across several feet of structure ranged up to 18-40 ppm Au and 38 ppm Ag. Values from Freeport drill cuttings ran <.02-.2 ppm Au.

The BLM microfiche indicated that Freeport had some 60+ "Liberty" claims in 1983, but dropped them in December 1985. They were subsequently refiled by Chuck and Margie Kunkes. I contacted the Freeport geologist, Alan Morran,who confirmed that Freeport had returned the claims to the Kunkes, the underlying claimants who have picked up most of the nearby countryside including Van Deemen in the last 10-15 years. Freeport staked because the previous claims were in disarray. The Kunkes' have since learned enough exploration/mining vocabulary "to be dangerous." J. D. Sell June 3, 1987 Page 2

Freeport drilled +22 RDH (RC) in the property in 1985. They hit a number of discontinuous .OX opt Au (mostly <.05 opt) and a few 5-10' zones of 0.1 opt Au near to low-high angle breccia intersections. In the field it appeared that many RDH were preferentially sited near high-angle structures. Unfortunately, below the oxidation level (±100') values dropped off sharply and there was little dissemination away from structure. Freeport also spent considerable time mapping the area and collected several 100 geochem samples, analyzed for a number of elements. Silver, arsenic and molybdenum were particularly anomalous among other elements. There is a 1000' x I000' As anomally that halos Au mineralization. Freeport confirmed that there was a good relationship between the more mafic metamorphics and gold mineralization, but the gold is probably genetically related to Mid-Tertiary volcanism-intrusives and faulting. Freeport thought the drill results were discouraging. Freeport gave a complete set of data to the Kunkes including geologic mapping.

It appears that the Liberty Mine is a poorly developed distal end of the Van Deemen system and the best targets have been tested. The Fischer-Watt people have obviously looked at the Liberty data and probably do not want it at Kunkes' price. However, it is worth obtaining the data for the record/ educational purposes. The Kunkes have other "good looking" ground not under option. The Kunkes are presently on vacation, but I will stop by and look at what they have sometime this summer.

FRK:mek F. R. Koutz Attachments: ERS Sample Map Field/Sample Notes Assays TAJ-481

• " r j.~ j i

4 ~ ~ ~ Present claim owner T Chuck & Margie Kunkes Box 1652 ASARCO EXPLORATION RECORD Dolan Springs, AZ 86441 {E] FIELD EXAMINATION E] LITERATURE SEARCH E] ASARCO FILE E3 602-767-3831 Section I General Indexinq Gold Bug Dist. (~ Name(e) of Property or Area ® co.,~y Mohave Co. (~ stateAr°r'Pr°vincel zona LIBERTY MINE USGSQuid. ~)RIs orGonl NO. (Golden Age - 1936) Mr. Perkins-15 ~) Latitude . (~)Longitude ~) AMS Sheet Township Range Section I~)[xomlnsd by F. R. Koutz ~ oats 32, 5/7/87 35°42'N 114°32'N Kingman 27N 21W 33 @alia, 10 ~e,dOoy, Tucson I 6 hours Section I1 Sources of Information Date Typed 6/I ;7 ~) References Author Dote Title Publications Val. No. Wi Ikens, J. 1984 Arizona Geol.Soc. Fall Field Trip Guidebook (Day I +1979 Map) Gardner, E.D. 1936 Au Mine + Mill, Black Mtns; USGM IC 6901 p. 57 Fischer-Watt Gold + AZ Star Res.(Prospectus 6/30/86) Van Deemen Property I mi.NW Sectionlll Appr0isol USGS PP-374E, 1963 C.R. Longwell {)Recommendations ~) __ Detachment + ~ Production Commodity Tons Past P~duaer Grade Action Now xL~JListric Fits Au ore XO0 .X opt ] Too Low Grade ~-1 Producer [•] Geologic Concept [~] Too S~oll/Spott ~] Mineral Deposit aeo©hem Anomaly- O O~mlrIltlpProblem I~ Prospoot Gaophy Anomaly ~. Reserves N AccessPrnblem {~] FreeDort-R~n Relict Paten "" ['7 I~qmsured [~ Estimated P~Ob£ain Drill L~l uata Drilled 19~5 in District --Commodity Tons Grade O, um.Or,,,.o,.22+ (?) (~)Ex©nvatlon$Sev. shafts to None ~,Tnmi~ma.(4000'±?) "1000' Workings 1OO' ~O Spectra. Analysis Attached ~])~]~ Assays Attached TAJ-481 ~] Geochem Results Attached Section IV Geologic Data Commodily0rC0ntainedMetols AuO_Ag (Reported As+Mo anomal .)

Ore Minerals-Major Au-Ag Minor Py Tcpy-CuOx Minor OHostRocks-Major Qtz-Mus-schist gr-gneiss diorite schMinor felsiq./r~afic to N. diKeS Patsy Mine Vol O AgeofHost Rocks pE +pegs(pE) pE mT? 18.6 14.5 m. O NotureofExposums Good: Desert pediment + low hills, fair to good outcrop (schist is slumped). 200-400' relief. Pegmatites plus felsic and mafia dikes locally lace area O Alteration Bleaching-sericite plus hematitic flooding-silicification along structures mad colorlan Much of mafics locally chloritized O~talExtentHvy color anom:2:8OO'x500', Halo ¼~l~mi (~Structure WNW to NNW IOto30°NE low angle shears(detachment-related) with NW& ±NE high angle listric normal faults. Foliation in schist rolls alot. OreOccurrenceln low angle struct, plus intersecting/feeding higher angle struct. Heavy bleaching/hem.flooding usually limited to <10' structure.Spotty. Best Freeport results 5-10' of 0.1 opt Au in a few D.H. ~AgeofMinerolizationpost14.5my,pre11.gmy (faulting) ~ConcIusions~RecomrnendationsA short distance into footwall of l istric fault system. Not as well developed as VanDeemen. Considerable areas of fresh-looking schist/gneiss between shear zones are probably waste. Low angle/high angle shears may coalesce at shallow depth but mostly stacked listric-normal faults in Dist. rather than master detachmenl Worth obtaining Freeport's sampling/drill data plus Kunkes has other zones in district not held by Fischer-Watt. "1936,USBM: I-6' 25 ° vein', av. 3 I~ ore bunchy, 125'driftli,n vein-small sh!pments" Au values drop sharply below n~;H;> 7nn~ (_+I(10 depth) , (Foroddltionolspoce useextrosheefs| ~'~/~r,'~ DmlRlea*dL.l,~,mM If3J~J._tM I ~ UIIw--drI(II SKYLINE LABS, INC. 1775 W. Sahuaro Dr. • P.O. Box 50106 Tucson, Arizona 85703 (602) 622-4836 PRELIMINARY: REPORT OF ANALYSIS

JOB NO, TAJ' 481 May 28~ 1987 BH-1 TO LIB-15 SI-'IIF~MENT NO, : BH & L.IB PAGE I OF "! ASARCO INCORPORATFD Attn: Mr, l':'lee'l'wood R, t

Analysis o.£ 16 Roc:k Chip Samples

Au Ag II'EM SAMPI..E NO, (ppm) (ppm)

~:j LIB-..1. ,09 ,8 6 LIE,3 ,. ~:),... ,02 <,2

8 LIB-4 < , 0~:2 < , 2. !;121;~~i~ ,32 ='"~:,:,,.~.,:'~O ...... "

1 I. LIB~.,6B < | 02 I "~~',.

•l::~ } ~ :;;:;EIB= 7 ...... t8::;: 0 ~ "1,3 L I B'-" 8 ,4 0 8,8 14~, '~:;;f~.:!'O~O~:~,: 3;8ii 0 ~ "

16 LIB....t I ,20 ,2 "t? LIB..-'I 2 ,05 ,P. "jl. 8 L.IB-J. 3' < , 02 ,4 19 LIB"'k 4 ,03 ,2

wNO'TE~ Greater than normal, geochemical range, P I e a ~.~e a d v :i. se i .f .£ i r e a '".-~,,ay {" is needed,

NO"fIE: Go].d, Silver and Plat:i.nut~ results pend:i.ng, ~- 9a " ;IL' L. C C : Asarco Incorporated 8o u'l'hwestenn Exp].oration P,O, Box 5747 Tucson, Arizona 85785 At'l'n,: Mr, J'ames D, Sell Ms, Mary Kavanagl",

Charles E. Thompson William L. Lehmbeck James A. Martin Arizona Registered Assayer No. 9427 Arizona Registered Assayer No. 9425 Arizona Registered Assayer No. 11122 i~i ¸ ~,~• >

SKYLINE LABS, INC. 1775 W. Sahuaro Dr. • P.O. Box 50106 Tucson, Arizona 85703 (602) 622-4836

REI:~OIRI" OF:" ANALYSIS

JOB NO. TAJ 481 June 5~ "i 98'7 BI..I-I TO l..IB-l'=.i SI-III:~MENT NO. : BH .% LIB PAGE '! OF 2 ABARCO INCORPORATED A't-'tn: Mr, Fleei'wood R, l

Au Ag ITEM SAMI:~LE NO. (ppm) (ppm)

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Southwestern Exploration Division • 7 J :

June 4, 1987

J.D. Se] l

G:~l~:Bug District ~ ...... Mohave County, Arizona

Thank you for your comments on my June 3 Liberty Mine memo. Rest assured that I will get as much "free" data out of Kunkes as possible.

I attach several things that will clear up your questTons: "Stratigraphic and Tectonic Setting of the North Central Black Mtns. & Detrital Valley' by Joe Wilkins (1984 AGS Field Trip hand-out to go with guidebook). This shows the style of rotated and laterally transported Tertiary, Laramide and Precambrian sections along a downward-flattening and coalescing syn- thetic listric normal fault system or "stacking." These faults may be offset by orthogonal antithetic faults (Basin and Range age ?). This style is present in detail at a variety of scales.

Note that Heidrick and Wilkens mapped (AGS Guidebook) Sec. 28 & 29 N&NW of the Liberty Mine including Van Deemen (but they did few Au-Ag assays).

You are right, it is necessary to determine which systems, directions and projections carry values of viable grade and size. Which level structurally Liberty or Van Deemen are on is uncertain. The Van Deemen (or another) flat breccia zones (westerly dips) were apparently drilled through under the Liberty Mine flat fault (N70W, 20-30°NE). Perhaps Freeport's geologic maps and drill sections will show this relationship. But I also know that many of these low angle fault surfaces are themselves folded--so strike and dip are not good criteria to correlate fault surfaces. I have found no good way to tell which high or low angle fault is a feeder (when projected). Intersections of fractures-fissures in fairly competent rock are necessary (= breccia). The ore-grade pods at these intersections are seldom larger than an acre and are difficult to project (and mine-plan).

You are right that the valley to the west of the Liberty Mine is of interest, and, in fact, is part of the Van Deemen Property (attachment), and has been locally drilled bY Amselco, Kunkes, Fischer-Watt and others. Freeport held parts of Sec. 31 (and may have also drilled there). Much of the area is apparently so thickly covered with alluvium to preclude an open pit. Beyond the west side line of R21W is Lake Mead Nat. Rec. Area (NPS).

Mockingbird is part of the same flat-fault system that extends under most of the Black Range (and into California) and includes Van Deemen/Liberty. Which plate or slice Mockingbird is in is impossible to tell" at present. I'm not sure that this is a genetically important question to the development of open- pit gold mines here. The relationship to mineralizing Tertiary intrusives is more imoortant.

FRK: mek F. R. Art. (2) STRATIGRAPHIC AND TECTONIC SETTING OF THE NORTH,CENTRAL BLACK MOUNTAINS AND DETRITAL VALLEY, I MOHAVE COUNTY, ARIZONA i by Joe Wilkins, Jr. /~///>~

INTRODUCTION

The initial mapping in the area (figure i) was a reconnaissance geologic map by Longwell who outlined the general volcanic stratigraphy of the region. Subsequent work by Anderson (1971, 1978) and Anderson and others (1972) have further defined the volcanic stratigraphy and the te~onic setting of the Lake Mead - Eldorado Mountains, Nevada area. A younger series of flat-lying volcanic and sedimentary rocks which unconformably cap older sequences have been_ mapped by Longwell (1928, 1963), correlated by Lucchitta (1979) and Blair (1978), and age-dated by Damon (1967, 1979) and Anderson and others (1972).

The majority of the previous geologic studies have been in the Lake Mead and Southeastern Nevada areas. Except for Anderson's (1978) map of the Black Canyon 15" Quadrangle, the only previous work in the North-central Black Mountains, Detrital Valley and the White Hills has been cursory reconnaissance-type surveys.

In 1977 and 1979~ dur~g a porphyry copper exploration program, about 20 square miles in the North-central Black Mountains and White Hills were mapped and sampled and 3 holes drilled in Detrital Valley. The data acquired form the basis fori the following report and field trip guide.

STRATIGRAPHY

A generalized stratigraphic column showing Longwe~'s (1963) section and Anderson and others' (1972) modification is shown on figure 2. In this portion of Arizona and Nevada there is a minimum of 16,000 feet of volcanic flows, tuffs, tuff breccias and volcanoclastic sedimentary rocks deposited on a Precambrian basement. This volcanic sequence is uncon- formably overlain by 3000 to 5000 feet of late Tertiary to Holocene sedimentary rocks, volcanic flows and tuffs, and alluvium. At least 16,000 feet of Paleozoic and Mesozoic rocks, present on the Colorado Plateau (to the . East) and near LaG Vegas (to the West) have been removed from this area. !

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Figure I Regional' geological setting and tocation map ./r {~~;2

EXPLANATION L/ ¢lLi I ~0 kill |Oell ' Rnyo~ncltl ~wOt o~11 ~':j m~I~'0' t hyolotll **lIJp ¥olco~¢1 |ll, ~ol*Oltl( Onlfllll ~¢I

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Figure 2. Generalized stratigraphic section of the volvanic, volcaniclastic and sedimentary rocks in the Detrital Valley and North Central Black Moun- tains, Mohave Count~, Arizona.

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-2- J =/ Patsy Mine Volcanics. J / The Patsy Mine volcanics, deposited on Precambrian basement and Laramide (?) intrusions, consist of 13,000- 14,000 feet of flows, flow breccias, lahars, vitrophyres, tuffs, tuff breccias and welded turfs ranging in composition from andesite to rhyolite. Longwell (1963) subdivided the volcanic pile into 2 units: the Patsy Mine and the Golden Door. The original Patsy Mine consisted of about 5000 feet of dark-colored andesite to basalt flows, flow breccias, and lahars with minor pyroclastics. The Golden Door units were a lighter-colored sequence, about 5000 feet thick, and dominantly rhyolite to rhyodacite flows, flow breccias, vitrophyres and ruffs. Anderson (1971) dropped the Golden Door nomenclature, added the units to the Patsy Mine sequence, and subdivided the section as follows:

Lower part - 9100 feet, pyroxene-olivine andesite flows and flow breccias. Middle part - 2700 feet, rhyolite flows and tuffs Upper part - 15.00 feet, pyroxene - olivine andesite with rhyodacite at the base.

K-At ages for the Patsy Mine range from 18.6 at the base to 14.5 at the top with several discordant ages (22.8, 27.9, 40.8 m.y.) present in lower units (Anderson and others, 1972).

Bridge Spring Tuff.

The Bridge Spring tuff is a 700-foot thick, sheet- like welded rhyolite ashflow tuff that is widespread in the Eldorado Mountains, Nevada, and Chemehuevi Valley, Cali- fornia. It has not been recognized in the central Black Mountains. Arizona. The tuff conformably overlies the Patsy Mine volcanics and was K-At dated at 14.5 m.y. (Anderson and others 1972).

Mount Davis Volcanics.

The Mount Davis volcanics include about 2000 feet of flows, flow breccias, and tuffs intercalated with coarse fanglomerates composed of Precambrian gneiss-schist clasts or Precambrian schist-gneiss plus tertiary volcanic clasts. Compositions vary from olivine basalt to andesite with some rhyodacites. The base of the Mount .Davis was K-Ar dated at 14.6 m.y. and the top of the sequence dated at 12.0 to 11.8 m.y. (Anderson and others 1972). E- o o~

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Figure 3. Cross-Section in the Eldorado Mountain, Nevada After Anderson (1971) / -3- % 2 ¸ Muddy Creek Formation.

/ / The Muddy Creek formation unconformably overlies (usually with a strong angular unconformity) Mount Davis and Patsy Mine units. The Muddy Creek formation is a valley- fill sequence of interfingering fanglomerates, sandstones, shales, siltstones, evaporites, a marine limestone, basalt flows and tuffs. The marine limestone is the Hualapai limestone member and was assigned marine origin by Blair (1978) on the basis of microfossils and chert geochemistry. K-At ages of tuffs and basalt flows in the Hualapai member are 8.4 and 11.9 {Blair, 1978). In Detrital Valley, the Muddy Creek formation has a minimum thickness of at least 2000 feet.

Fortification Hill Basalt.

The Fortification Hill basalt member of the Muddy Creek formation is a series of flat-lying~ mesa-capping basalt flows at or near the top of the Muddy Creek formation. Several flows appear to cap Colorado River gravels (Damon, 1978), and may be younger than the Muddy Creek. A whole rock K-Ar date for the lowermost flow unit on Fortification Hill was 5.88 m.y. and the basalt at Sandy Point yielded a 3.8 m.y. date (Damon, 1979).

TECTONICS

Virtually all of the pre-Muddy Creek litho!ogies in the North-central Black Mountains, the Whi{-e Hills, and Detrital Valley are allochthonous. The sch~t-gne~s basement, the Laramide porphyry copper system, and the Patsy Mine and Mount Davis volcanics all display geologic features which are characteristic of mass transport along high and low-angle normal faults. This style of thin-skinned crustal deformation in an extensional environment was elegantly documented by Anderson (1971) in the Eldorado Mountains, Nevada. The cross-section on figure 3 is Anderson's (1971) East-West section through the Eldorados and graphically illustrat~ the extensional tectonic setting.

Structural style.

In contrast to detachment-faulted terranes, especially those related to metamorphic cone complexes, (Davis and others, 1980, Reynolds and Rehrig, 1980) there does not appear to be a basal detachment fault (in this area} flooring an extended upper plate sequence. Instead distributed shear along stacked listric normal faults appears to accommodate the crustal stretching. As shown by Anderson (1971) and on figure 3, a 2 km thick section of crustal rocks have been rotated and transported laterally along a series of downward flattening listric normal faults. Detachment-style -4- faults which are present (as Shown on figure 3 and as low- angle normal faults on figure 4) appear to be flat portions of listric normal faults or perhaps earlier listric faults rotated by a later set of listric faults.

The terranes are characterized by moderately to steeply-dipping (occasionally overturned) Patsy Mine and Mt. Davis volcanics. As noted by Anderson (1971) an orthogonal relationship between stratigraphic units and the rotating faults is usually present. That is, the angle between the fault and the bedding attitude of the hanging wall unit is 90 degrees; the steeper the dip the flatter the fault. Brittle deformation, including breccias, megabreccias, anti- thetic and sympathetic high-angle faults and shear zones commonly obscures or obliterates the primary depositional fabric in the volcanic rocks adjacent to the fault plane. The deformation decreases upward, downward, and away from the fault plane. The faults are sinuous structures which trend NNW and consistently dip west. Movement appears to have been S80°W-directed.

Age of Faulting.

The age of faulting, though not directly datable, can be inferred from the ages of the rocks involved and those not involved. Extension began in mid-to-late Patsy Mine time or about 16 to 14 moy. Extension was in effect prior to Mount Davis time as indicated by cons~ten~y flaker dips in the Mount Davis volcanics compared to the Patsy Mine volcanics. The Mount Davis volcanics and related fan- glomerates are probably a synkinematic sequence common to extensional terranes. For compar~on, in the Whipple-Buckskin Complex, the synkinematic Copper Basin formation ~ cons~ten~y less rotated than the pretectonic Gene Canyon formation (Frost, 1982, Davis and others, 1980).

Extensional tectonism ended following Mt. Davis time and before Muddy Creek time - between 12.0 and 11.9 m.y.

On the AoG.S. field trip (Fall 1984) we will examine several aspects of the stratigraphy and tectonics which are exposed in the Pope Mine Area.

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FEET 0 I000 2000 FEET I r W,G. STEVENSON 8t DATE: R21W ASSOCIATES LTD, MARCH, 1986 ".~ 44 -

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W-S. STEVENSON B: IDATE: R2~W ASSOCIATES LTD_ I MARCH', 1986