| Deposit ID | 10014729 |
|---|---|
| MRDS ID | D011628 |
| Record type | Site |
| Current site name | Big Casino Mine |
| Alternate or previous names | Patented Claims: Big Casino No. 2, MS 69a, Big Casino No. 2 Mill Site, MS 69b, Big Casino No. 2, MS 836 |
| Geographic coordinates: | -107.43313, 38.01028 (WGS84) |
|---|---|
| Elevation | 2987 |
| Relative position | 6.5 MILES S 79 W FROM LAKE CITY |
Political divisions (FIPS codes)
Hinsdale(county)
Colorado(state)
United States(country)
North America(continent)
Land(continent)
USGS map quadrangles
Uncompahgre Peak(quadrangle 1:24,000 scale)
Montrose(quadrangle 1:100,000 scale)
Montrose(quadrangle 1:250,000 scale)
Hydrologic units (watersheds)
Upper Gunnison(hydrologic unit)
Gunnison(hydrologic accounting unit)
Gunnison(hydrologic subregion)
Upper Colorado(hydrologic region)
Federal lands
Bureau of Land Management(Bureau of Land Management CO)
Bureau of Land Management CO BLM(Type of land area)
BLM(Federal land areas administered by BLM)
| Country | State | County |
|---|---|---|
| United States | Colorado | Hinsdale |
| Meridian | Township | Range | Section | Fraction | State |
|---|---|---|---|---|---|
| New Mexico | 043N;044N | 005W;005W | 04,05;34 | E2 OF E2 (05); W2 OF W2 (04); S2 OF SW (34) | Colorado |
| Commodity | Importance |
|---|---|
| Silver | Primary |
| Gold | Primary |
| Lead | Primary |
| Copper | Secondary |
| Zinc Critical | Tertiary |
| Antimony Critical | Tertiary |
| Materials | Type of material |
|---|---|
| Galena | Ore |
| Sphalerite | Ore |
| Quartz | Gangue |
| Host or associated | Associated | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Rock type | Volcanic Rock (Aphanitic) > Felsic Volcanic Rock > Rhyolite | ||||||||
| Rock unit name | Eureka Member Of Sapinero Mesa Tuff | ||||||||
| Rock description | Eureka Member Of Sapinero Mesa Tuff | ||||||||
| |||||||||
| Host or associated | Host |
|---|---|
| Rock type | Volcanic Rock (Aphanitic) > Pyroclastic Rock > Volcanic Breccia (Agglomerate) |
| Host or associated | Host |
|---|---|
| Rock type | Volcanic Rock (Aphanitic) > Felsic Volcanic Rock > Rhyolite |
| Rock unit name | Picayune Megabreccia Member Of Sapinero Mesa Tuff |
| Rock description | Picayune Megabreccia Member Of Sapinero Mesa Tuff |
| (1) | -107.43313, 38.01028 |
|---|
| Type of structure | Regional |
|---|---|
| Structure description | San Juan Volcanic Field, San Juan Depression |
| Type of structure | Local |
| Structure description | San Juan-Uncompahgre Calderas, Lake City Caldera, Eureka Graben |
| Thickness | 1.52M |
|---|
| Development status | Past Producer |
|---|---|
| Commodity type | Metallic |
| Deposit size | Small |
| Significant | No |
| Discovery year | 1876 |
| Discoverer | John J. Holbrock (Claimant) |
| Year of last production | 1968 |
| District name | Galena (Henson Creek) District |
|---|
| Ownership category | Private |
|---|
| Type | Owner-Operator |
|---|---|
| Owner | Dawson Mining Co. |
| Home office | Grand Junction, Co. |
| First year | 1969 |
| Year | 1927 | |||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Description | Ap_Grade: ^29 Oz/Ton Ag, 0.04 Oz/Ton Au, 32.6% Pb, 29% Zn | |||||||||||||||||||||||||||||||||||
| ||||||||||||||||||||||||||||||||||||
| Year | 1928 | ||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Description | Ap_Grade: ^33.3 Oz/Ton Ag, 24.5% Pb, 22.8% Zn | ||||||||||||||||||||||||||||
| |||||||||||||||||||||||||||||
| Year | 1968 | ||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Description | Ap_Grade: ^34.8 Oz/Ton Ag, 0.01 Oz/Ton Au, 21.5% Pb, 19% Zn, 0.5% Cu | ||||||||||||||||||||||||||||||||||||||||||
| |||||||||||||||||||||||||||||||||||||||||||
| Agency | Database name | Acronym | Record ID | Notes |
|---|---|---|---|---|
| USGS | Mineral Resources Data System | MRDS | D011628 |
IRVING, J.D., AND BANCROFT, HOWLAND, 1911, GEOLOGY AND ORE DEPOSITS NEAR LAKE CITY, COLORADO: USGS BULL. 478, P. 81.
LIPMAN, P.W., 1976, GEOLOGIC MAP OF THE LAKE CITY CALDERA AREA, WESTERN SAN JUAN MOUNTAINS, SOUTHWESTERN COLORADO: USGS MAP I-962.
COLORADO DIV. MINES INF. REPTS. AND ANNUAL OPERATOR REPTS.
BLM MINERAL SURVEY MS 69A&B, 836
COLORADO DIV. MINES ANNUAL OPERATOR REPTS.
| Subject category | Comment text |
|---|---|
| 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. |
| Type | Date | Name | Affiliation | Comment |
|---|---|---|---|---|
| Reporter | 01-APR-1984 | Schwochow, Stephen D. | Colorado Geological Survey |
Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.
These are landing pages for further research — the state agencies don't currently expose per-mine deep links.