The Little Gem is a copper mine located in Lander county, Nevada.
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
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.
Little Gem MRDS details
Site Name
Primary: Little Gem
Commodity
Primary: Copper
Secondary: Gold
Secondary: Silver
Secondary: Lead
Secondary: Arsenic
Location
State: Nevada
County: Lander
District: Bullion
Land Status
Not available
Holdings
Not available
Workings
Type: Underground
Ownership
Not available
Production
Not available
Deposit
Record Type: Site
Operation Category: Past Producer
Deposit Type: Vein
Operation Type: Unknown
Year First Production: 1907
Discovery Year: 1907
Years of Production:
Organization:
Significant: N
Deposit Size: M
Physiography
General Physiographic Area: Intermontane Plateaus
Physiographic Province: Basin And Range Province
Physiographic Section: Great Basin
Physiographic Detail: Basin And Mountains
Mineral Deposit Model
Not available
Orebody
Form: TABULAR
Structure
Type: R
Description: Deposit In Upper Plate Of Roberts Mtn Thrust
Type: L
Description: High Angle Basin & Range Period Faults, Normal Faults
Alterations
Alteration Type: L
Alteration Text: Country Rock Argillized Outwards From Stock
Rocks
Name: Diorite
Role: Associated
Age Type: Host Rock Unit
Age Young: Late Ordovician
Name: Diorite
Role: Associated
Age Type: Host Rock
Age Young: Late Ordovician
Analytical Data
Not available
Materials
Ore: Gold
Ore: Cerargyrite
Ore: Malachite
Ore: Chalcopyrite
Ore: Bornite
Ore: Galena
Gangue: Quartz
Gangue: Calcite
Gangue: Limonite
Comments
Comment (Deposit): ORE OCCURS IN A FAULT-FISSURE VEIN
Comment (Workings): INCLINED SHAFT AND SUBSIDIARY TUNNELS
Comment (Geology): THE ORE OCCURS IN A FAULT FISSURE VEIN COMPOSED LARGELY OF QUARTZ & CRUSHED COUNTRY ROCK. THE VEIN AVERAGES 4 FEET IN WIDTH, STRIKES E-W WITH A FLAT DIP TO THE SOUTH. MOST OF PRODUCTION OF SEVERAL THOUSAND TONS HAS BEEN FROM THE OXIDIZED ZONE. THE SULPHIDE ZONE APPEARS 75 FEET BELOW THE SURFACE CONTAINS ARSENOPYRITE, SPHALERITE, CHALCOPYRITE, GALENA, AND PYRITE. THE HOST ROCK IS STRONGLY SHEETED PARALLEL TO THE LODE AND ARGILLIZED AND SERICITIZED NEAR THE LODE. THE OREBODY STRIKES AN AVERAGE OF WEST AND DIPS ABOUT 30S. THE VEIN IS FROM 1 TO 6 FEET WIDE AND IS A ZONE OF CLOSELY SPACED PARALLEL SHEETS OF QUARTZ AND SULPHIDES. SINCE IT WAS FORMED THE VEIN HAS BEEN CRUSHED & SHATTERED BY MOVEMENT PARALLEL TO THE WALLS. IT IS CROSSED BY SEVERAL NORMAL FAULTS WHICH DO NOT APPRECIABLY OFFSET THE OREBODY (EMMONS, 1910).
Comment (Deposit): THE MINE COMPRISES ONE PATENTED AND THREE UNPATENTED CLAIMS. A 50 TON FLOTATION MILL WAS CONSTRUCTED IN 1937 BUT SOON CLOSED DOWN DUE TO METALLURGICAL DIFFICULTIES. WORKINGS CONSIST OF A 435 FOOT DEEP INCLINED SHAFT AND 1,500 FEET OF SUBSIDIARY TUNNELS. IN 1908 18 CARLOADS OF ORE YIELDED ABOUT $30 TON. ; INFO.SRC : 1 PUB LIT
Comment (Production): 18 CARLOADS ORE AVERAGING $30/TON WERE SHIPPED IN 1907. PRODUCTION INCLUDED SOME LEAD AND ARSENIC.
Comment (Development): ONE PATENTED AND THREE UNPATENTED CLAIMS: A 50-TON FLOTATION MILL WAS CONSTRUCTED IN 1937 BUT SOON CLOSED DOWN DUE TO METALLURGICAL DIFFICULTIES
References
Reference (Deposit): STAGER, H.K. (1977) GEOLOGY & MINERAL RESOURCES OF LANDER CO NEV, N.B.M. BULL 88
Reference (Deposit): USBM (WINNEMUCCA) MILS NO. 87, REFERENCE NO. 3201500121
Reference (Deposit): EMMONS, W.H. (1910) RECONNAISSANCE OF MINING DISTRICTS IN ELKO, LANDER, & EUREKA COS., USGS BULL 408
Reference (Deposit): WRUCKE, C.T. (1974) GEOLOGIC MAP OF THE TENABO AREA, LANDER CO NEV, USGS MAP MF-647
Reference (Production): STAGER, H.K. (1977)
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.
