Mine detail: Fortitude Mine

Previously called ''

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Location

Lat / long: 40.5483, -117.13244

Resource(M)

Primary: Gold, Silver
Secondary: Copper, Lead, Zinc
Tertiary: Mercury, Molybdenum, Arsenic, Bismuth, Tellurium, Antimony, Cobalt, Nickel, Chromium, Manganese
Ore: Gold, Electrum, Pyrrhotite, Pyrite, Chalcopyrite, Arsenopyrite, Marcasite, Galena, Sphalerite, Bismuth, Hedleyite, Jonesite, Volynskite
Gangue: Hedenbergite, Andradite, Diopside, Actinolite, Chlorite, Epidote, Prehnite, Calcite, Quartz, Garnet, Grossularite
Orebody form: tabular

Production

Operation type: Surface
Deposit type: replacement
Production size: Medium
Development status: Past Producer
Production years: 1984-1993
First production started: 1984
Last production ended: 1993

Geology

Host rock:Antler Peak Limestone, Antler Sequence, Battle Formation
Host type:Limestone,Conglomerate,Siltstone
Associated rock:Battle Formation, Edna Mountain Formation, Copper Canyon Granodiorite
Associated type:Conglomerate,Shale,Quartzite,Sandstone,Limestone,Granodiorite
Structure:Virgin Fault, Golconda Thrust
Alteration processes:Skarn formation began with the alteration of clastic rich sedimentary rocks to biotite/skarn hornfels. Introduction of metasomatic fluids further extended the biotite halo, flooding the system with k and fe, and adding orthoclase to the biotite hornfels assemblage. This assemblage replaced much of the protolith regardless of original composition. Continued metasomatism at high temperature (300C - 550C) formed garnet and pyroxene in calcareous rocks and overprinted the biotite-orthoclase hornfels. Sulfide minerals, dominated by pyrrhotite, began to precipitate with the garnet-pyroxene skarn and continued as temperatures declined. Gold mineralization began at 300C-400C and continued to lower temperatures along with minor arsenopyrite, pyrite, marcasite, sphalerite, galena, bismuth, and tellurides. During cooling of the hydrothermal system, the garnet-pyroxene skarn was altered to actinolite, prehnite, and chlorite.

References

MRDSW700375
DEP10310329
Reference{Deposit:: MYERS, G. L. AND MEINERT, L.D., 1991, ALTERATION, MINERALIZATION, AND GOLD DISTRIBUTION IN THE FORTITUDE GOLD SKARN, IN RAINES, G.L., ET AL, EDS., GEOLOGY AND ORE DEPOSITS OF THE GREAT BASIN, THE GEOLOGICAL SOCIETY OF NEVADA, RENO, P. 407-417.}{Deposit:: MYERS, G.L., 1990, ALTERATION ZONATION OF THE FORTITUDE GOLD SKARN DEPOSIT, LANDER COUNTY, NEVADA, MINING ENGINEERING, VOL. 42, NO. 4, P. 360-368.}{Deposit:: TAYLOR, R. S., 1990 AIRBORNE EM RESISTIVITY APPLIED TO EXPLORATION FOR DISSEMINATED PRECIOUS METAL DEPOSITS, GEOPHYSICS; THE LEADING EDGE OF EXPLORATION, VOL. 9, NO. 2, P. 34-41.}{Deposit:: ROCKY MOUNTAIN PAY DIRT, MAY, 1988, P. 6A-8A.}{Deposit:: METAL MARKET CONSULTANTS, INC., 1987, GOLD SITUATION MAP.}{Deposit:: MINING MAGAZINE, JANUARY, 1989, P. 44.}{Deposit:: BATTLE MOUNTAIN GOLD CO., 1988, ANNUAL REPORT FOR 1987.}{Deposit:: WOTRUBA, P.R., BENSON, R.G., AND SCHMIDT, K.W., 1988, GEOLOGY OF THE FORTITUDE GOLD-SILVER SKARN DEPOSIT, COPPER CANYON, LANDER COUNTY, NEVADA IN SCHAFER, R.W., COOPER, J.J., AND VIKRE, P.G., EDS., BULK MINEABLE PRECIOUS METAL DEPOSITS OF THE WESTERN UNITED STATES SYMPOSIUM PROCEEDINGS, GEOLOGICAL SOCIETY OF NEVADA, RENO, NEVADA, APRIL 6-8, 1987, P.150-171.}{Deposit:: WOTRUBA, P.R., BENSON, R.G., AND SCHMIDT, K.W., 1986, BATTLE MOUNTAIN DESCRIBES THE GEOLOGY OF THE FORTITUDE GOLD-SILVER DEPOSIT AT COPPER CANYON: MINING ENGINEERING, V. 38, N. 7 (JULY), P495-499}{Deposit:: DOEBRICH, JEFF, 1993, ORAL AND WRITTEN COMMUNICATIONS CONCERNING THIS RECORD, BASED ON HIS FIELD WORK AND PROFESSIONAL CONTACTS, MAY AND JUNE 1993}{Deposit:: NBMG, 1994, MI-1993}{Deposit:: NEVADA DIVISION OF MINERALS, 1994}{Deposit:: Long, K.R., DeYoung, J.H., Jr., and Ludington, S.D., 1998, Database of significant deposits of gold, silver, copper, lead, and zinc in the United States; Part A, Database description and analysis; part B, Digital database: U.S. Geological Survey Open-File Report 98-206, 33 p., one 3.5 inch diskette.}{Deposit:: Doebrich, Jeff, 1995, Geology and Mineral Deposits of the Antler Peak n7.5-minute quadrangle, Lander County, Nevada, NBMG Bull 109, 44 p.}{Deposit:: Geological Society of Nevada, 1999, Geology and Gold Mineralization of the Buffalo Valley Area, Northwestern Battle Mountain Trend; GSN Special Publication No. 31, 1999 Fall field trip Guidebook.}{Deposit:: Wendt, Clancy, 2004, Technical Report on the ICBM/COPPER BASIN Property, Lander and Humboldt Counties, Nevada, Staccato Gold website, : http://www.staccatogold.com/i/pdf/icbm-43-101.pdf}{Production:: 1985-1987 ANNUAL PRODUCTION: BATTLE MOUNTAIN GOLD CO., 1988, ANNUAL REPORT FOR 1987. CUMULATIVE PRODUCTION FIGURES FROM DOEBRICH, WRITTEN COMMUNICATION, JUNE 1993, FROM COMPANY SOURCES. NBMG MI-1993}{Reserve-Resource:: 1985 -1987 RESERVE FIGURES: BATTLE MOUNTAIN GOLD CO., 1988, ANNUAL REPORT FOR 1987. NBMG MI-1993}
ReporterLaPointe., D.D., Schruben, Paul G., Li, Zhiping (Moyer, Lorre A.), Marcus, S., Phinisey, J. D. (Marcus, S.), Skurski, M. (Marcus, Sue), Beougher, Delilah J. (Spanski, Gregory T.), Paidakovich, Matthew E.