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Betty O'neal/St. George Metals' ·Properties Lander County, Nevada

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Betty O'neal/St. George Metals' ·Properties Lander County, Nevada ( PROGRESS REPORT- BETTY O'NEAL/ST. GEORGE METALS' ·PROPERTIES LANDER COUNTY, NEVADA DECEMBER .7, 1992 Prepared by: Arthur R. Leger Cyprus Metals Company- Sparks, Nevada Prepared for: J.A. Matlock Cyprus Metals Company 1320 Freeport Blvd. Sparks, Nevada ( CONTENTS _, PAGE SUMMARY AND RECOMMENDATIONS ......................................................... ! INTRODUCTION ......................................................................................... 3 Location and accessibility ................................................................................ 3 Climate, topography, and vegetation ................................................................... 3 Mining history and previous exploration activities .................................................. 3 l.and ................................ ····· ................................................................... 11 Exploration Methods .................................................................................... 12 GENERAL GEOLOGY ................................................................................ 12 Sedimentary rocks ....................................................................................... 12 Paleozoic rocks .................................................................................. 12 Siliceous - volcanic (western) assemblage.·: ............ ·: ........................ 12 (Ordovician System- Valmy Formation) ........ :......................... 12 Overlap assemblage .................................................................... 15 (Pennsylvanian and Permian Systems- Antler Sequence) ............. 15 Havallah sequence ........................................... ·: ........................ 15 (Pennsylvanian and Permian Systems - Havallah Formation) ......... 16 Mesozoic strata .................................................................................. 16 Triassic System - Panther Canyon Member of the Augusta Mountains Formation ..... 16 Igneous rocks ............................................................................................. 16 II Contents, Cont. ( PAGE Intrusive rocks ................................................................................... 17 Extrusive units ................................................................................... 17 STRUCTURAL SUMMARY .......................................................................... 17 Regional structure ........................................................................................ 17 Paleozoic deformation .......................................................................... 17 Antler orogeny - Roberts Mountain thrust.. ....................................... 17 Sonoma orogeny - Golconda thrust. ................................................ 19 Post- Upper Paleozoic tilting ....................................................... 19 Mesozoic folding ................................................................................ 19 Tertiary faulting ................................................................................. 20 ( PREVIOUS EXPLORATION RESULTS ........................................................... 20 Noranda .................................................................................................... 20 Silver - lead - zinc veins ....................................................................... 21 Gold ............................................................................................... 21 St. George/Reynolds Metals ........................................................................... 22 Cyprus activities ......................................................................................... 22 Geology ........................................................................................... 22 Local structure ................................................................................... 23 Mineralization ................................................................................... 24 Alteration ......................................................................................... 24 Geochemistry .................................................................................... 25 III Contents, Cont. ( PAGE Rock-chip ................................................................................ 25 Soil. ...................................................................................... 25 Geophysics ..................................................................· ..................... 25 Magnetics ................................................................................ 25 IF/Resistivity ............................................................................ 27 Lineaments ....................................................................................... 29 RECOMMENDATIONS ............................................................................... 29 REFERENCES CITED ................................................................................. 31 IV 'I CONTENTS ILLUSTRATIONS (Plates are in packet) PLATE I. Land status - Lewis District: . Lander County, Nevada (1 II= 1000') II. Betty O'Neal Mine- composite of mine workings (1 II =200') III. Land holdings- Section 22, T30N, R45E: Betty O'Neal/Lower Whisky Canyon area (1 II =200') IV. Geologic map of St. George property: Lander County, Nevada (1 II= 1000') v. Geologic map of Betty O'Neal/Lower Whisky Canyon area (1 II =200') VI. Rock-chip geochem map- Betty O'Neal/Lower Whisky Canyon: ( Lander County, Nevada (1 ~~-200') VII. Gold soil geochem map- Lower Whisky Canyon (1 II =200') VIII. Silver soil geochem map- Lower Whisky Canyon (1 II =2Q0') IX. Arsenic soil geochem map - Lower Whisky Canyon (1 II =200') X. Antimony soil geochem map- Lower Whisky Canyon (1 II =200') XI. Zinc soil geochem map - Lower Whisky Canyon (1" =200') XII. Aeromagnetic, ground magnetic, IF/Resistivity interpretation map - St. George/Betty O'Neal properties: Lander County, Nevada (1 II= 1000') XIII. Aeromagnetic, ground magnetic, IF/Resistivity and total lineament map - Betty O'Neal/Lower Whisky Canyon area: Lander County, Nevada (1 II =200') v .i ( PAGE Figure 1. Location of Betty O'Neal and St. George Metals' Properties ......... .4 2. Photograph of Lewis District - looking southeast ........................ 5 3. Fisher gold project - Lucky Rock/Red Cap area .......................... 6 4. Fisher gold project- Whisky Canyon area ................................. 6 5. Lewis District - property map ................................................ 7 6. Fisher gold project - claim map ............................................ 10 7. Stratigraphic column - Betty O'Neal area ................................ 13 8. Structural relationship of the Paleozoic rocks of North-Central Nevada .................................................... 14 9. Simplified geologic map of north-central Nevada ....................... 18 10. Location map for Cyprus rock-chip samples ............................. 26 11. Section showing proposed gold targets I and II Betty O'Neal- Lower Whisky Canron ................................... 30 VI .• . APPENDICES ( PAGE A. Mineralized drill intercepts: . Noranda- Betty O'Neal Project- 1980-81. ....................................... 33 B. St. George Metals, Inc. drilling summary, Lucky Rock - Red Cap area ......................................................... 36 C. Cyprus rock-chip geochemical data: Betty O'Neal area- Sections 22 & 23, T30N, R45E ............................ 45 VII ( SUMMARY AND RECOMMENDATIONS The Betty O'Neal/St. George Metals' land holdings are located in the Lewis Mining District, on the west side of the Shoshone Range, 14 miles south of the town of Battle Mountain, Nevada. Silver was discovered in the Lewis District in 1870, and the Betty O'Neal Mine started producing silver in 1880. Early production records are unavailable but from 1922 through 1928, 170,388 tons of ore were milled, averaging 24 oz./ton silver. The mine ceased production in 1928. Past exploration activities, in the search for gold and silver, include surface and underground mapping, geophysical surveys, rock-chip and soil grochemical surveys, and drilling. These activities were performed by Noranda (1980-81), St. George Metals, Inc. (1986-88), and Reynolds Metals Company (1988-1991). Gold mineralization was found to be hosted by the Ordovician age Valmy Formation and generally restricted to narrow, north-northwest trending quartz veins. Two areas within the range were found to contain a drill indicated "geologic resource" of approximately 1,000,000 tons grading 0.026 oz. Au/ton and 445,000 tons grading 0.036 oz. Au/ton at a 0.010 oz. Au/ton cut-off grade. Cyprus personnel (ARL and DAD) became interested in the area because of the recorded precious metal occurrences and recorded Antler sequence rocks cropping out adjacent to pediment gravels. Geologic mapping and rock-chip/soil geochemical data have revealed the presence of mineralized Havallah sequence rocks croping out in the pediment west of outcropping Antler units. In addition, a N40° W structure (Lower Whisky Canyon Fault) appears to be a mineralizing feeder and trends into the Havallah rocks. It is proposed that the gold and associated trace element mineralization noted in the outcropping Havallah units, may represent leakage from a buried, Antler sequence hosted gold deposit. Aeromagnetic and IP/Resistivity data have defined a major northwest-southeast trending structure, located off the range front, which
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