The Gwin Mine is a gold mine located in Calaveras county, California at an elevation of 1,050 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: 1,050 Feet (320 Meters)
Commodity: Gold
Lat, Long: 38.26667, -120.76667
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.
Gwin Mine MRDS details
Site Name
Primary: Gwin Mine
Secondary: Paloma
Secondary: Gwin Ext No. 1
Commodity
Primary: Gold
Secondary: Silver
Tertiary: Zinc
Tertiary: Copper
Tertiary: Lead
Location
State: California
County: Calaveras
Land Status
Not available
Holdings
Not available
Workings
Type: Underground
Ownership
Not available
Production
Not available
Deposit
Record Type: Site
Operation Category: Past Producer
Operation Type: Unknown
Years of Production:
Organization:
Significant: N
Deposit Size: S
Physiography
General Physiographic Area: Pacific Mountain System
Physiographic Province: Cascade-Sierra Mountains
Physiographic Section: Sierra Nevada
Mineral Deposit Model
Not available
Orebody
Not available
Structure
Not available
Alterations
Not available
Rocks
Name: Slate
Role: Host
Age Type: Host Rock Unit
Age Young: Late Jurassic
Name: Slate
Role: Host
Age Type: Host Rock
Age Young: Late Jurassic
Analytical Data
Not available
Materials
Ore: Sphalerite
Ore: Pyrite
Ore: Gold
Gangue: Sericite
Gangue: Quartz
Gangue: Albite
Gangue: Calcite
Comments
Comment (Deposit): VEIN, STRINGERS ARE COMMON. ARSENOPYRITE IN LGE AND SMALL CRYSTALS. A CONGLOMERATE LIES ON FOOTWALL OF VEIN AND CARRIES $.50 PER TON IN AU. THERE ARE 2 VEINS; EAST OR MAIN VEIN AND WEST VEIN. EAST VEIN MOST PRODUCTIVE. AT 2400 FT LEVEL A NEW ORE BODY ENCOUNTERED, 1700 FT SOUTH OF CROSSCUT FROM MAIN SHAFT
Comment (Workings): DEVELOPED BY 2533 FT VERTICAL MAIN SHAFT, 1800 FT INCLINED SOUTH SHAFT AND SEVERAL OLD SHALLOW SHAFT. MORE THAN 2500 FT OF UNDERGROUND WORKINGS
Comment (Geology): GWIN VEIN IN SAME MARIPOSA SLATE AS MINES TO NORTH IN AMADOR CO., BELT OF SLATE IS 2000 FT WIDE.
Comment (Commodity): WHEN GALENA AND SPHALERITE ARE PRESENT IN SMALL AMOUNT, ARE CONSIDERED TO INDICATE GOOD ORE. LARGE CRYSTALS OF ARSENOPYRITE INCLOSE ARBONESCENT MASSES OF CRYSTAL GOLD. FREE GOLD COARSE AND CAUGHT IN NO. 16 SCREEN ON MORTARS, 98 % OF AU RECOVERED THIS WAY - QUITE UNIQUE AND HIGH AVERAGE. SULFIDES IN SLATE HAVE HIGH AG FRACTION AND LOWER AG FRACTION. ORE SHOOT IS PYRAMIDAL IN SHAPE AND VERTICLE AS FAR AS IS EXPLOITED
Comment (Production): ESTIMATES FOR TOTAL OUTPUT VARY FROM $6 - $7 MIL OF GOLD AT OLD PRICE, ACTIVE 1850 - 1882 , 1894 - 1908 , 1927 , 1941 , 1946$1399146 TOTAL BULLION OUTPUT 1871-1882, 1897-1901, 2701959 TONS YIELDED $1121425.
Comment (Reserve-Resource): NEW SOUTH ORE SHOOT CONTAINED FROM 0.79 TO 1.3 OZ OF AU PER TON
References
Reference (Deposit): CLARK, W. B., LYDON, P. A, 1962 , MINES AND MINERAL RESOURCES OF CALAVERAS COUNTY, CALIF.; COUNTY REPORT 2 ; CALIF. DIV. OF MINES AND GEOLOGY, P 56 - 59 156 , AND PL B
Reference (Deposit): LOGAN, C. A., 1935 , MOTHER LODE GOLD BELT OF CALIF.: CDM BULL. 108 , P 141 - 2 AND PL 6
Reference (Deposit): LOGAN, C. A., FRANKE, H., 1936 , MINES AND MINERAL RESOURCES OF CALAVERAS COUNTY; CALIF. JOUR. MINES AND GEOLOGY, VOL. 32 , NO. 3 ; DIV. OF MINES, P 307
Reference (Production): CLARK ( 1962 ) LOGAN ( 1934 )
California Gold
"Where to Find Gold in California" looks at the density of modern placer mining claims along with historical gold mining locations and mining district descriptions to determine areas of high gold discovery potential in California. Read more: Where to Find Gold in California.
