The Tomboy Mine is a gold mine located in Lander county, Nevada at an elevation of 5,801 feet.
About the MRDS Data:
All mine locations were obtained from the USGS Mineral Resources Data System. The locations and other information in this database have not been verified for accuracy. It should be assumed that all mines are on private property.
Mine Info
Elevation: 5,801 Feet (1,768 Meters)
Commodity: Gold
Lat, Long: 40.52361, -117.11917
Map: View on Google Maps
Satelite View
MRDS mine locations are often very general, and in some cases are incorrect. Some mine remains have been covered or removed by modern industrial activity or by development of things like housing. The satellite view offers a quick glimpse as to whether the MRDS location corresponds to visible mine remains.
Tomboy Mine MRDS details
Site Name
Primary: Tomboy Mine
Secondary: Tomboy-Minnie
Commodity
Primary: Gold
Secondary: Copper
Secondary: Silver
Secondary: Lead
Tertiary: Iron
Tertiary: Zinc
Location
State: Nevada
County: Lander
District: Battle Mountain District
Land Status
Not available
Holdings
Not available
Workings
Not available
Ownership
Owner Name: Battle Mountain Gold Co.
Production
Year: 1982
Time Period: 1978-1982
Material type: ORE-AU,AG
Description: Cp_Grade: ^0.09 Opt Au, 0.28 Opt Ag
Deposit
Record Type: Site
Operation Category: Past Producer
Deposit Type: Replacement
Operation Type: Unknown
Year First Production: 1925
Year Last Production: 1982
Discovery Year: 1900
Years of Production:
Organization:
Significant: N
Deposit Size: S
Physiography
General Physiographic Area: Intermontane Plateaus
Physiographic Province: Basin And Range Province
Physiographic Section: Great Basin
Physiographic Detail: Basin & Mountains
Mineral Deposit Model
Model Name: Skarn Cu
Orebody
Not available
Structure
Type: R
Description: Roberts Mountains Thrust; Dewitt Thrust
Type: L
Description: N-S Striking, Steeply East Dipping Faults
Alterations
Alteration Type: L
Alteration Text: Prograde Skarn, Retrograde Skarn. See Geology Comments.
Rocks
Name: Shale
Role: Associated
Age Type: Host Rock
Age Young: Pennsylvanian
Name: Shale
Role: Associated
Age Type: Host Rock Unit
Age Young: Pennsylvanian
Analytical Data
Not available
Materials
Ore: Galena
Ore: Chalcopyrite
Gangue: Sericite
Gangue: Tremolite
Gangue: Sphalerite
Gangue: Pyrrhotite
Gangue: Apatite
Gangue: Plagioclase
Gangue: Sphene
Gangue: Epidote
Gangue: Diopside
Gangue: Chlorite
Gangue: Pyrite
Gangue: Quartz
Gangue: Marcasite
Comments
Comment (Geology): CONGLOMERATE. MINERALIZED FRACTURES CONTINUE DOWNWARD INTO THE HARMONY FORMATION, BUT THERE IS NOTICEABLY LESS EXTENSIVE MINERALIZATION ADJACENT TO THEM THERE. SULFIDE CONTENT IN ORE ZONES IN THE BASAL CONGLOMERATE OF THE BATTLE FORMATION RANGES 10-50 VOLUME PERCENT AND CONSISTS MOSTLY OF PYRRHOTITE AND PYRITE. LOCAL POD-LIKE REPLACEMENT BODIES OF FE-RICH SPHALERITE AND GALENA HAVE ALSO BEEN RECOGNIZED. OTHER SULFIDES IN DECREASING ABUNDANCE INCLUDE MARCASITE (REPLACING PYRRHOTITE), CHALCOPYRITE, AND ARSENOPYRITE.
Comment (Deposit): REFER ALSO TO MINNIE MINE (RECORD #231355).
Comment (Development): THE PROPERTY WAS LOCATED BY LYMAN SANDS AND WILLIAM GIBSON ABOUT 1900. WORK WAS SPORADIC WITH NO PRODUCTION UNTIL 1926 WHEN SANDS ERECTED A 35 TPD DENVER QUARTZ MILL SE OF THE MINE. THE MILL OPERATED FOR 7 MONTHS, TREATING 4000 TONS OF ORE. THE PROPERTY WAS THEN ACQUIRED BY SHOVELIN, WHOSE LESSEES SHIPPED SOME ORE TO UTAH SMELTERS THROUGH 1938. IN 1948, A ROAD WAS CONSTRUCTED TO THE COPPER CANYON MINING CO. MILL A MILE TO THE NORTH, AND 5723 TONS OF ORE WERE TRUCKED THERE FROM THE TOMBOY MINE FOR PROCESSING. THE HEADS AVERAGED 0.22 OPT AU AND THE RECOVERY WAS 0.18 OPT AU. DUVAL CORP. (NOW BATTLE MOUNTAIN GOLD CO.) ACQUIRED THE PROPERTY IN 1968. DUVAL MINED THE TOMBOY-MINNIE DEPOSITS 1978-1982.
Comment (Workings): PRE-1965 WORKINGS CONSISTED OF 3 SHORT ADITS AND AN OPEN PIT. 1978-82 PRODUCTION WAS BY OPEN PIT.
Comment (Geology): ALTERATION COMMENTS: PROGRADE SKARN, RETROGRADE SKARN. SHALE AND SILTSTONE OF THE HARMONY FORMATION WERE CONVERTED TO BROWN BIOTITE HORNFELS DURING EMPLACEMENT OF THE GRANODIORITE OF COPPER CANYON, WHILE SANDSTONES SHOW STRONG EFFECTS OF RECRYSTALLIZATION AND SILICIFICATION WHEREIN THE FINE GRAINED MATRIX WAS ALTERED TO CLAY MINERALS, WHITE MICA, AND SECONDARY QUARTZ. THERMAL EFFECTS RESULTED IN THE CALCAREOUS BASAL CONGLOMERATE OF THE BATTLE FORMATION BEING CONVERTED TO A QUARTZ+DIOPSIDE+EPIDOTE HORNFELS ASSEMBLAGE WITH SPARSE GARNET REPLACING SOME LIMESTONE CLASTS. INTRODUCTION OF FREE GOLD AND PYRITE OCCURRED PENECONTEMPORANEOUSLY WITH REPLACEMENT OF THE EARLY DIOPSIDE ASSEMBLAGE BY ACTINOLITE, TREMOLITE, AND CHLORITE. GEOLOGY COMMENTS: PRE-1965 WORKINGS WERE IN CONGLOMERATE IN THE LOWER PART OF THE BATTLE FORMATION JUST ABOVE THE CONTACT WITH THE HARMONY FORMATION. THE OREBODY WAS LOCALIZED IN AND NEAR FRACTURES THAT CUT THE CONGLOMERATE AND IN REPLACEMENT ZONES WITHIN THE
Comment (Commodity): THE TEXTURAL RELATIONSHIP OF AU TO OTHER MINERALS IN THE ORE ZONES HAD NOT BEEN RECOGNIZED IN MICROSCOPIC WORK COMPLETED THROUGH 1984. HOWEVER, STATISTICAL EVALUATION OF DRILL HOLE ASSAYS SUGGESTS THAT AU IS CLOSELY ASSOCIATED WITH PYRRHOTITE AND PYRITE. FREE AU, GENERALLY LESS THAN 0.05 MM DIAMETER, WAS RECOVERED DURING MILLING OF ORE FROM THE TOMBOY-MINNIE DEPOSITS. AG MINERALIZATION CORRELATES CLOSELY WITH THE OCCURRENCE OF GALENA. ANOMALOUS AU, AG VALUES AT OR NEAR SURFACE ARE SPATIALLY ASSOCIATED WITH THE OREBODIES. THIS ZONE IS SURROUNDED BY A HALO OF ANOMALOUS ZN, PB VALUES.
Comment (Location): WITHIN BOX CANYON.
References
Reference (Production): 1925-1949 ANNUAL PRODUCTION: ROBERTS, R. J. AND ARNOLD, D. C., 1965, ORE DEPOSITS OF THE ANTLER PEAK QUADRANGLE, HUMBOLDT AND LANDER COUNTIES, NEVADA, USGS BULLETIN 459-B. 1978-1982 CUMULATIVE PRODUCTION: THEODORE, T. G., HOWE, S. S., BLAKE, D. W., AND WOTRUBA, P. R., 1986, GEOCHEMICAL AND FLUID ZONATION IN THE SKARN ENVIRONMENT AT THE TOMBOY-MINNIE GOLD DEPOSITS, LANDER COUNTY, NEVADA, JOURNAL OF GEOCHEMICAL EXPLORATION, VOL. 25, P. 99-128.
Reference (Deposit): STEWART, J. H., MCKEE, E. H., AND STAGER, H. K., 1977, GEOLOGY AND MINERAL DEPOSITS OF LANDER COUNTY, NEVADA, NBMG BULL. 88.
Reference (Deposit): VANDERBURG, 1939, RECONNAISSANCE OF MINING DISTRICTS IN LANDER COUNTY, NEVADA, USBM INFORMATION CIRCULAR 7043.
Reference (Deposit): ROBERTS, R. J. AND ARNOLD, D. C., 1965, ORE DEPOSITS OF THE ANTLER PEAK QUADRANGLE, HUMBOLDT AND LANDER COUNTIES, NEVADA, USGS BULLETIN 459-B.
Reference (Deposit): JACKSON, D., 1982, HOW DUVAL TRANSFORMED ITS BATTLE MOUNTAIN PROPERTIES FROM COPPER TO GOLD, ENGINEERING AND MINING JOURNAL, V. 183, NO. 10, P. 95-99.
Reference (Deposit): THEODORE, T. G., HOWE, S. S., BLAKE, D. W., AND WOTRUBA, P. R., 1986, GEOCHEMICAL AND FLUID ZONATION IN THE SKARN ENVIRONMENT AT THE TOMBOY-MINNIE GOLD DEPOSITS, LANDER COUNTY, NEVADA, JOURNAL OF GEOCHEMICAL EXPLORATION, VOL. 25, P. 99-128.
Reference (Deposit): THEODORE, T. G., 1971, GEOLOGIC MAP OF THE COPPER CANYON AREA, BATTLE MOUNTAIN MINING DISTRICT, LANDER COUNTY, NEVADA, USGS OPEN FILE REPORT 71-282.
Reference (Deposit): THEODORE, T. G., HOWE, S. S., AND BLAKE, D. W., 1990, THE TOMBOY-MINNIE GOLD DEPOSITS AT COPPER CANYON, LANDER COUNTY, NEVADA, USGS BULL. 1857E, P. E43-E55.
Reference (Deposit): BLAKE, D. W. AND KRETSCHMER, E. L., 1980, GOLD DEPOSITS AT COPPER CANYON, LANDER COUNTY, NEVADA, ABSTRACT, AIME PRECIOUS METALS SYMPOSIUM, SPARKS, NEVADA.
Reference (Deposit): BLAKE, D. W., KRETSCHMER, E. L., AND THEODORE, T. G., 1978, GEOLOGY AND MINERALIZATION OF THE COPPER CANYON DEPOSITS, LANDER COUNTY, NEVADA, IN GUIDEBOOK TO MINERAL DEPOSITS OF THE CENTRAL GREAT BASIN, NBMG REPORT 32, P. 45-48.
Nevada Gold
Nevada has a total of 368 distinct gold districts. Of the of those, just 36 are major producers with production and/or reserves of over 1,000,000 ounces, 49 have production and/or reserves of over 100,000 ounces, with the rest having less than 100,000 ounces. Read more: Gold Districts of Nevada.
