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Geology of the Groom District Li700l?'] C0tc3ty

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Geology of the Groom District Li700l?'] C0tc3ty 77524 IIKIlUFDqiTY GEOLOGY OF THE GROOM DISTRICT LI700L?'] C0TC3TY. NEVADA A THESIS submitted to m ; faculty OF THE OHIV RSITY OF NEVADA IM PARTIAL FULFILLED T OF THE REQUIREMENTS FOR THE DEGREE OF ENGINEER OF MIMES BY FRED L. HUMPHREY /» 1948 4/a ^ A£ A fe - 7 7 0 ^ 77524 UNIVERSITY OF NEVADA. RENO r i Z L C.4 / Submitted by FRED L . ®JM?HREY Candidate for degree DIVERSITY OF NEVADA BULLETIN 3L. X X X IX JUNE 1945 No. 5 GEOLOGY AND MINING SERIES No. 42 'eology of the Groom District, Lincoln County, Nevada 'eology of the Groom District, Lincoln County, Nevada By Fred L. H u m p h r e y Geologist, Nevada State Bureau of Mines PRICE TWENTY-FIVE CENTS Publication of the Nevada State Bureau of Mines AND THE MACKAY SCHOOL OF MINES Ja y A . C a r p e n t e r , Director v>A, _ A- . PUBLISHED QUARTERLY BY THE U n iv e r s it y o f N e v a d a RENO, NEVADA Entered in the Post Office at Reno, Nevada, as second-class matter unde: Congress, July 16, 1894. Acceptance for mailing at special rate of pos1 vided for in section 1103, .Act of October 3, 1917„ authorized April 1 )7| V W f t i t t s ' I 9 + f 1 STATE PRINTING OFFICE OF NEVADA JACK MCCARTHY, SUPERINTENDED - - . - CARSON CITY 77524 TABLE OF CONTENTS PAGE ce................ 7 act............................................. g luction...................................................................... g jocation.................................................................. g ’ield work.................................................................. 79 acknowledgments........................................................ 70 ce features........................................ j 7 -•v........................................ 13 tegional features......................................................... 73 ’rospeet Mountain quartzite............................................. 75 ’ioche shale.......................................................... 7g iyndon limestone........................................................... 77 Jhisholm shale....................................... 78 ’easley limestone.......................................................... 79 undeiiurrows dolomite.................................................. 79 af postfighland Peak formation................................................. 21 Lpnl 2,artial Cambrian section of the Groom district.......................... 22 gneous rocks................................................................... 26 fracture...................... ................ .2 7 The graben area........................................................... 29 alization................................................................... 32 ead, silver, and zincdeposits ............................................ 32 Mode of occurrence...................................................... 33 old deposits................................................................. 34 and Prospects............................................................... 35 room mine................................................................ 35 he Lane claims...................................................... ' 45 [anus shaft................................................................. 47 ther gold prospects.............................................................. 47 Recommendations for further exploration in the district.......... 47 ILLUSTRATIONS E PAGE Map of Nevada showing location of Groom district:................ 8 Geologic map and sections of Groom district, Lincoln County, Nevada..................................................................... In pocket Central portion of the south end of Groom Range. View northward from 1 mile south of Groom mine, showing a cross-section of the area mapped..........._■.......................... 12 Cross-section of the south end of Groom Range...................... 14 View of the Highland Peak formation...................................... 20 View of the Peasley limestone showing effects of drag folding.... 28 Generalized cross-sections showing, progressively, the main structural features responsible for the fault-block of shale and limestone in the quartzite................................... 30 Geologic map and section of the Groom mine area..........In pocket Aerial photograph of Groom mine area, by courtesy of the Las Vegas Army A ir Field............................................... 36 Plan of the 100 foot level of the Groom Mine showing the major geologic features...........................................In pocket Cross-section C-C' of Figure 8 showing structural and strati­ graphic features near Groom shaft................................... 40 Cross-section E -E ' of Figure 8 showing structural and strati­ graphic features 600 feet south of Groom shaft................. 41 Plan of the 200 foot level of the Groom mine showing the major geologic features........................................... In pocket dross-section D -D ' of Figure 8 showing structural and strati­ graphic features 400 feet north of Groom shaft................. 44 Map showing claims within the area mapped...................In pocket View of graben area, looking south, from 11 miles north of Groom shaft...................................................................... 46 Cross-section of graben area 21 miles north of Groom shaft, showing possible stratigraphy below the block of over­ thrust quartzite................................................................. 48 PREFACE ce 1986 the Nevada State Bureau of Mines has been making iy of Cambrian stratigraphy in Nevada. It has been aided 5 work of the Hunt Foundation summer geology field course > Mackay School of Mines. 3 geologist in charge has been Dr. Harry E. Wheeler, Associ- rofessor of Geology, University of Nevada. 3 bulletins issued a re : imbrian Formations of the Eureka and Pioche Districts, la,” 3visions in the Cambrian Stratigraphy of the Pioche Dis- Nevada,” >wer and Middle Cambrian Stratigraphy in the Great Basin Dr. Wheeler has so aptly stated in the first of these bulletins, lowledge of Cambrian stratigraphy is of great importance derstanding the' geological relationships of numerous ore its in Nevada, especially in the areas of the widespread -lead-zinc mineralization of the eastern, central, and south- artions of the State. The need of such knowledge is mani- l any rational attempt to discover new deposits, or to locate splaced continuations of previously known ore bodies, which most invariably faulted into segments.” 3 bulletin extends the study to cover the Groom district in uthwestern part of Lincoln County. Dr. Wheeler is on leave in the service of the U. S. Navy, ork was carried out by Fred L. Humphrey, who was already ar with Cambrian stratigraphy through study under Dr. er. Paul Gemmill of the Prince Mine at Pioche, Nevada, served idvisory capacity. His acquaintance with Cambrian strati- V covers the years since he was graduated from the Mackay of Mines in 1930. JAY A. CARPENTER, Director. I FIGURE 1—Map of Nevada showing location of Groom distri OLOGY OF THE GROOM DISTRICT, LINCOLN COUNTY, NEVADA B y F red L. H u m p h r e y ABSTRACT ild work in the Groom district has shown a distinct lithologic irity in the Lower and Middle Cambrian stratigraphy with f the Pioche district. An exceptionally thick section of pect Mountain quartzite forms the west side of the Groom e, measuring over 7,000 feet in thickness, with the base, as tot disclosed. There is no distinct evidence of fault repeti- in this section. No diagnostic fossils were found in the beet Mountain quartzite, but it is the writer’s opinion that brmation extends into the Pre-Cambrian. The east side of r e ange displays excellent exposures of the Pioche, Lyndon, E lolm, Peasley, Burrows, and Highland Peak formations, with tostic fossil horizons. Volcanics, dominantly andesite, cover -idiments in the central portion of the range, e structure, in the southern portion of the Groom Range, is aratively simple, with the exception of a fault block, or :n, within the quartzite, which is very complexly faulted, e graben area is a downfaulted block of Pioche shale and on limestone, probably antedating the period of Basin and ;e faulting. It contains the only known mineralization of mic importance, which is dominantly a replacement of lime- by argentiferous galena. INTRODUCTION LOCATION Groom mining district is situated in southwestern Lincoln j;y, Nevada, about 75 miles west-southwest of Caliente. The |ct lies in an unsurveyed area of the State, but is probably |n Township 7 south, Range 55 east, M. D. B. & M. It is ed by a 45-mile dirt road from Crystal Springs which is 42 from Caliente on the Galiente-Las Vegas highway (U S 93). i is a 60-mile dirt road into the district from Indian Springs ! south, on the Las Vegas-Tonopah highway (U S 95). This ^cannot be used at the present time as it crosses the Arm y =sry Range. iistnherein restricted, the Groom mining district is in the south- rn portion of a small isolated north-south mountain range, ly south of Tern Piute. For want of any apparent name nge will be called the “Groom Range.” It is separated from 10 Geology of the Groom District the Timpahute Range on the west and north by the nory extremities of Emigrant Valley, and from the Silver 4d Mountains on the east by Desert Valley. n FIELD WORK le The Nevada State Bureau of Mines has long been adog studying and mapping the Cambrian sedimentary seque1® eastern and southern Nevada. This work has been carri™ as an aid to the exploration and development of the iP.( resources of the State.
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