The Big Casino Mine is a gold, lead, and silver mine located in Hinsdale county, Colorado at an elevation of 9,800 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: 9,800 Feet (2,987 Meters)
Commodity: Gold, Lead, Silver
Lat, Long: 38.01028, -107.43250
Map: View on Google Maps
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Big Casino Mine MRDS details
Site Name
Primary: Big Casino Mine
Secondary: Patented Claims: Big Casino No. 2, MS 69a
Secondary: Big Casino No. 2 Mill Site, MS 69b
Secondary: Big Casino No. 2, MS 836
Commodity
Primary: Gold
Primary: Lead
Primary: Silver
Secondary: Copper
Tertiary: Zinc
Tertiary: Antimony
Location
State: Colorado
County: Hinsdale
District: Galena (Henson Creek) District
Land Status
Land ownership: Private
Note: the land ownership field only identifies whether the area the mine is in is generally on public lands like Forest Service or BLM land, or if it is in an area that is generally private property. It does not definitively identify property status, nor does it indicate claim status or whether an area is open to prospecting. Always respect private property.
Holdings
Not available
Workings
Not available
Ownership
Owner Name: Dawson Mining Co.
Home Office: Grand Junction, Co.
Years: 1969 -
Production
Year: 1927
Description: Ap_Grade: ^29 Oz/Ton Ag, 0.04 Oz/Ton Au, 32.6% Pb, 29% Zn
Year: 1968
Description: Ap_Grade: ^34.8 Oz/Ton Ag, 0.01 Oz/Ton Au, 21.5% Pb, 19% Zn, 0.5% Cu
Year: 1928
Description: Ap_Grade: ^33.3 Oz/Ton Ag, 24.5% Pb, 22.8% Zn
Deposit
Record Type: Site
Operation Category: Past Producer
Deposit Type: Vein
Operation Type: Unknown
Year Last Production: 1968
Discovery Year: 1876
Discovery Method: Ore-Mineral In Place
Years of Production:
Organization:
Significant: N
Deposit Size: S
Physiography
General Physiographic Area: Rocky Mountain System
Physiographic Province: Southern Rocky Mountains
Mineral Deposit Model
Not available
Orebody
Not available
Structure
Type: R
Description: San Juan Volcanic Field, San Juan Depression
Type: L
Description: San Juan-Uncompahgre Calderas, Lake City Caldera, Eureka Graben
Alterations
Not available
Rocks
Name: Rhyolite
Role: Associated
Age Type: Host Rock
Age Young: Oligocene
Name: Rhyolite
Role: Associated
Age Type: Host Rock Unit
Age Young: Oligocene
Name: Rhyolite
Role: Associated
Age Type: Associated Rock
Age Young: Oligocene
Name: Rhyolite
Role: Associated
Age Type: Associated Rock Unit
Age Young: Oligocene
Analytical Data
Not available
Materials
Ore: Sphalerite
Ore: Galena
Gangue: Quartz
Comments
Comment (Location): CLAIMS LIE ON HILLSIDE BETWEEN BIG CASINO GULCH AND COPPER GULCH. ELEV AND LAT-LONG GIVEN ARE FOR PROSPECTS BETWEEN PRIDE OF AMERICA MINE AND LITTLE CASINO PROSPECTS IN W2 W2 SEC. 04 (FORESHORTENED, UNSURVEYED SECTION). ; INFO FROM LAND.ST :1977
Comment (Production): PARTIAL PRODUCTION RECORD. MINE REPORTEDLY PRODUCED IN 1916, BUT FIGURES FOR THIS YEAR AND ANY OTHER PRIOR YEARS ARE UNAVAILABLE.
Comment (Development): CLAIM WAS APPARENTLY FIRST LOCATED BY HOLBROCK BUT NOT PATENTED. MS 836 SURVEYED AND PATENTED IN 1881-1882 BY AUGUSTUS J. CLARK AND OTHERS.
Comment (Deposit): DEPOSIT LIES JUST OUTSIDE RIM OF LAKE CITY CALDERA IN UNCOMPAHGRE CALDERA INFILL ROCKS COMPOSED OF EUREKA MEMBER RHYOLITE AND PICAYUNE MEGABRECCIA, COMPOSED OF CHAOTIC MASSES OF PRECALDERA INTERMEDIATE-COMPOSITION ROCKS INTERPRETED TO BE RESULT OF SLUMPING FROM OVERSTEEPENED CALDERA WALLS DURING INITIAL SUBSIDENCE OF UNCOMPAHGRE CALDERA. DEPOSIT IS TRANSVERSE VEIN IN SLACK'S (1980) QUARTZ/BASE-METAL ASSEMBLAGE, INNER QUARTZ-CHALCOPYRITE ZONE. VEIN IS SW EXTENSION OF PRIDE OF AMERICA VEIN, TRENDING GENERALLY N 45 E. IRVING AND BANCROFT (1911) DESCRIBE ORE AS ARGENTIFEROUS TETRAHEDRITE AND GALENA.
Comment (Workings): CDM REPORTS DESCRIBE WORKINGS AS (PRESUMED) CROSSCUT TUNNEL DRIVEN GENERALLY SE FOR AT LEAST 500 FT, WITH DRIFT DRIVEN ON VEIN SW; 100 FT SE OF PORTAL IS 90-FT WINZE, WITH 70-FT SW DRIFT AND 50-FT NE DRIFT DRIVEN FROM 50-FT LEVEL IN WINZE; MAIN DRIFT WAS EXTENDED 100 FT IN 1968; DIAMOND DRILLING IN 1969.
References
Reference (Deposit): IRVING, J.D., AND BANCROFT, HOWLAND, 1911, GEOLOGY AND ORE DEPOSITS NEAR LAKE CITY, COLORADO: USGS BULL. 478, P. 81.
Reference (Deposit): SLACK, J.F., 1980, MULTISTAGE VEIN ORES OF THE LAKE CITY DISTRICT, WESTERN SAN MOUNTAINS, COLORADO: ECON. GEOLOGY, V. 75, NO. 7, P.963-991.
Reference (Deposit): LIPMAN, P.W., 1976, GEOLOGIC MAP OF THE LAKE CITY CALDERA AREA, WESTERN SAN JUAN MOUNTAINS, SOUTHWESTERN COLORADO: USGS MAP I-962.
Reference (Deposit): COLORADO DIV. MINES INF. REPTS. AND ANNUAL OPERATOR REPTS.
Reference (Deposit): BLM MINERAL SURVEY MS 69A&B, 836
Reference (Production): COLORADO DIV. MINES ANNUAL OPERATOR REPTS.
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