CONTACT INFORMATION Mining Records Curator Arizona Geological Survey 416 W. Congress St., Suite 100 Tucson, Arizona 85701 602-771-1601 http://www.azgs.az.gov [email protected] The following file is part of the Grover Heinrichs Mining Collection ACCESS STATEMENT These digitized collections are accessible for purposes of education and research. We have indicated what we know about copyright and rights of privacy, publicity, or trademark. Due to the nature of archival collections, we are not always able to identify this information. We are eager to hear from any rights owners, so that we may obtain accurate information. Upon request, we will remove material from public view while we address a rights issue. CONSTRAINTS STATEMENT The Arizona Geological Survey does not claim to control all rights for all materials in its collection. These rights include, but are not limited to: copyright, privacy rights, and cultural protection rights. The User hereby assumes all responsibility for obtaining any rights to use the material in excess of “fair use.” The Survey makes no intellectual property claims to the products created by individual authors in the manuscript collections, except when the author deeded those rights to the Survey or when those authors were employed by the State of Arizona and created intellectual products as a function of their official duties. The Survey does maintain property rights to the physical and digital representations of the works. QUALITY STATEMENT The Arizona Geological Survey is not responsible for the accuracy of the records, information, or opinions that may be contained in the files. The Survey collects, catalogs, and archives data on mineral properties regardless of its views of the veracity or accuracy of those data. / , [C 1 () C/3 A< . ffu.VvI '5 7)W1~~ '- Jc~k ~ Vv ' tJ, rt,M.,~ 5 / 1"!? t If' ot::1L~ ()tl? ,7) , ~ I r ,70-'2/ Prod . 11p .. - In~ L~. /6 -s I J;i7 (+ 'v ()~ 27/ 173 ," $ 7 Y'3 6- Y~ ~ S (J ~ 73 Y/ 31.r: 5 '1 OJ JJ Jtj c:f C~..ft I Y 7 t ? I .{~ If :- 5';. I ? '-/2) ) '? ~ 1 N tl ~, 2~ ,.r~ J: I '12.., ~'" f . l r l.~kC W . f . '17 !¢.u1'1 "/2v>A ( k~) I r m. 315- d f3 d/Jp ftr ,('r 5 f3. J1.: IM;tI W ' I. 'f-ff-..f7 1'4,'-r1 ' (q &;..-;n6 / ,'l;Y) '3 2--, s-r ~ ftu vJ 3;)/ rriJ ~ " ~'1.- I - I 11)- 3.... P ~ J 1/ () / I \ 2- ~~ n-V / frs ~ ... )P I q P-G :;.!>2-?,3, vrJ J;~/'O ---(8 '1 ~,' Cc/ t:l 3 ?,O, '~.2 :- j~1 VI r) fb tJ 'I,ll, ?J-t S s:.r?) - - , . '\, - ~- f ,~l K:-r5 ~ (/3~/'" rtJ~ J~ j) -<f, /(t-- h' Ck / f) .:ta ~ 1 st.~ ~ , ,~?<t' tPtL, / I£- ~' "2-- II 1 r- f-4.-., ( vv £t J - ~4 COl Lp ~.t t M, 11p ')....-'2.. ... 3 ') . Vfo- J 3- ~ ) (+ v I ,4- ~ Cc I~ \ I / I pts( 1:L 0 ~ ~ , f .,51. ) .tw1 ; 7h l -( fJ at'.; 6v J ~ ) 17 /7) I , S I; 0 J9, 11 , 62-. ~fc-I fit , e ..t, 1.~ (;'), ~) '))'fAA f . 1.... t]), N -J/j-/l~toit/ , (-t v, ~ jJ v~ - 7--,") - 1'5 rf (' ~ • ) ~ _ I i 7, ~, 'd~~j - f) v 0 ,?" OL.. (+5 I· 0£12- t ~? f~~~ V'~ N U " w' ?()), ~(;;d 1/ II () W 'fS' .5 .,~ ~ D'W (}u, - ) f 1/, N,S I "r ..... · frr'>- t. k~ t s-s . 013> W"~ ..: Js l-Jh I t~~ ~ tn!n t L ~ ') Cv ('l - Lee fr; )'\U<-{~' te--~ , Jf', '~ r~~' I ~·d~,.e.r I PI), h Ja- 4 td , C-1- j tf 0- // f'~, ~ k9: /1 0 1 -/~' 6 T~ 113/ 21r V. I ~,-") fJ ~ V '2-. 2, ~V f: S S-b, J7~ 3 ff 5 &I '1- ~ 2. b 1, /J-j -;.. 5'2.. 7 ul of 'Ii I T / ?:J ({/ /-78; ') 1ft?;:" <£) 'II) 783 (f 6 r_ II 67V,rJ-/l").;' S /) 7; 7 '10 3'2/ 162; R'4::f- fit /VI. c { '! drJ.' ,5 3J- "" f-. @!1 :<;, 2 ; dy I r .5 3.s-vvV . /fl'l. (dtj 'f)'" . ) L ~ "" 1/"',t,.,/ I ~., 1~ , eM f'o . C ./ 1 "7 ) 'r'" f1 v e r'ii' C h 11' f· . Ii II, It-s C / ) (I v {',,-~. PI J' j S>h r't~ '- /.!fr u .A,} f. I Pi, 11 S ;r w tOJ]> , ?>/ In/.v '(/ ~ ,g II"" /'I- <... f1. C. 1.1, f ..; #11' , h.,.; J I P W, 74- v,J fv.-e. A- 01 I t; -( . VI " -rh , $. lot. ('1)1 C I , b·, ct..,' ,C-: . c<o II,} fiU f.16 . A..eP L ~ f7r) ,f~.)Jtl) -lfrJ3 6 ct .. t fNoJ wJ ,." ." ." f. - 1-- 1'""..( Iq I -) f J6 Tn./) §' Z , • .:1- ~ j( (, 11 7 A. u :H16 - g- I'f/ tV; tJI-u, ", l', ".,1",6 AS or; LfI1r3tf;92IftfrS7 5lY·ff evil I, tJ"'.! $3 1'1 i ft #j I , y, 17r ~ II r 1/ JJ-PIi)- ,.r, 6j (6 I -s J -(; ~ R OR~~T ADDITIONAL DATA ON THE AGE AND EXTENT OF THE ROBERTS MOUNTAIN THRUST FAULT, NORTH-CENTRAL NEVADA Ralph J. Roberts and Robert E. Lehner U. S. Geological Survey, Menlo Park, Calif. ~51J The Roberts Mountains thrust fault is probably the most important structural element in central CurJ. Sec. r N 13t Kt/ Y \ /6{ ( '. I GEOLOGICAL SURVEY CIRCULAR 563 , Favorable Areas for Prospecting Adiacent to the Roberts Mountains Thrust in Southern Lander County, Nevada ,/ Prepared in cooperation with the Nevada Bureau of Mines r Favorable Areas for Prospecting Adiacent to the Roberts Mountains Thrust in Southern Lander County, Nevada By John H. Stewart and Edwin H. McKee G E 0 LOG I CAL SUR V Eye IRe U L A R 563 Prepared in cooperation with the Nevada Bureau of Mines Washington J 968 United States Department of the Interior STEWART L. UDAll, Secretary Geological Survey William T. Pecora, Director Free on application to the U.S. Geological Survey, Washington, D.C. 20242 CONTENTS Page Abstract ----------------- - -- - 1 Introduction --- - ---------------- - --- - -- I Ravenswood window - - - --------- -- -- - - - - -- - 2 Callaghan window --- - --- - - - ---- -- --- - -- - - 3 Toiyabe Range south of Austin ----------- -- --- - 3 Petes Canyon window - ----- -- ----- - -- - ----- 3 Suggestions for prospecting - -- -----_ . - - --- - __ _ 4 References cited - -- -- -- - --- - - --- - ---- __ _ 4 ILLUSTRATIONS Page Figure 1. Index maps showing pre-Tertiary rocks, mining districts, and sources of information in southern Lander County -- -- --- - -- - ----- -- - 6 2. Geologic map of Ravenswood window --- - ---- 8 3. Geologic map of Toiyabe Range south of Austin -- 10 4. Geologic map of Petes Canyon window - - - - --- 12 TABLE Page Table 1. Mining districts in southern Lander County and closely adjacent parts of Eureka and Nye Counties - -- - - --- -- ----- --- ---- 2 III EX PLAN A TION >- All uvium ]I o Volcanic rocks Welded tuJf H LOWE R PLATE OF UPPER PLATE O F RO BE RTS MOUNT)\IN ~ T H RUST ROBER TS MOUNTAINS TH RUST Roberts Mountains Format ion Platy lirnestone; black cheri at base Hansen Creek(?) Formation Cherty limestone, siltstone z « u > Antelope Valley Limestone o Vinini Formation o Massive- to medium-bedded a: Dark shale, black chert, o •l'imesto1lC quartzite FAULT """""""" " """"" ~}}}~}}{: Goodwin Limestone T hin-bedded ch.,"ty limesto-ne Contact Dashed whe..,'e approximately located Fault Dashed where approximately located. Bar and ball on downthrown sule ..&....-......l __ ••• •• Thrust faul t Dashed where approximately located; dotted where concealed. Sawteeth on upper plate Indined Vert1:cal Strike and dip of beds Figure 4. - Continued. J 3 U. s. GOVERNMENT P RINTING OFFICE: 1966 0 - 297-174 Favorable Areas for Prospecting Adjacent to the Roberts Mountains Thrust In Southern Lander County, Nevada By John H. Stewart and Edwin H. McKee Abstract and others, 1966). In addition, both deposits occur mainly in altered or silicified platy limestone of the Recent geologic mapping by the U.S. Geological Survey of more than 2,500 square miles of a relatively little-studied part of central Silurian Roberts Mountains Formation. The ore bodies Nevada has outlined four areas favorable for the discovery of me­ of the Bootstrap and Number E i g h t mines (Roberts, tallic mineral deposits. In these areas, lower Paleozoic carbonate 1966; Erickson and others, 1966) near the Carlin mine rocks crop out below the Roberts Mountains thrust, a widespread are in breccias along the Roberts Mountains thrust it­ fault in central and north-central Nevada. These areas have a self as are the gold deposits at Gold Acres (Gilluly stratigraphic and structural setting similar to that of the areas where large,open-plt gold depos its have been discovered recently and Gates, 1965, p. 134), about 8 miles northwest of at Carlin and Cortez in north- central Nevada. the Cortez deposits. The Roberts Mountains thrust and the Roberts Moun­ INTRODUCTION tains Formation in the lower plate of this thrust seem, therefore, to be particularly favorable places for me­ The recent discoveries of large open-pit gold de­ tallic ore deposits in north-central Nevada. We de­ posits at Carlin and Cortez in north-central Nevada scribe here four areas within southern LanderCounty (Hardie, 1966; Roberts, 1966; Roberts and 0 the r s, where the Roberts Mountains Formation crops out be­ 1967; Erickson and others, 1966; Wells and others, low the thrust. Granitic plutons that might have been 1967) have created interest in prospecting for similar a source for mineralizing solutions crop out in two of de p 0 sit s in nearby areas. During the last 2 years, these areas and are within a few miles of the two re­ mapping by the U.S. Geological Survey of more than maining areas.