| Deposit ID | 10014146 |
|---|---|
| MRDS ID | D010795 |
| Record type | Site |
| Current site name | Graysill Mine |
| Alternate or previous names | Graysill Group, Claims: Graysill 1-9 |
| Related records | 10118906 |
| Geographic coordinates: | -107.89786, 37.71279 (WGS84) |
|---|---|
| Elevation | 3316 |
| Relative position | 7.4 MILES N 81 E FROM RICO |
Political divisions (FIPS codes)
San Juan(county)
Colorado(state)
United States(country)
North America(continent)
Land(continent)
USGS map quadrangles
Hermosa Peak(quadrangle 1:24,000 scale)
Silverton(quadrangle 1:100,000 scale)
Durango(quadrangle 1:250,000 scale)
Hydrologic units (watersheds)
Animas(hydrologic unit)
Upper San Juan(hydrologic accounting unit)
San Juan(hydrologic subregion)
Upper Colorado(hydrologic region)
Federal lands
San Juan National Forest(National Forest)
National Forest FS(Type of land area)
FS(Federal land areas administered by FS)
| Country | State | County |
|---|---|---|
| United States | Colorado | San Juan |
| United States | Colorado | Dolores |
| Meridian | Township | Range | Section | Fraction | State |
|---|---|---|---|---|---|
| New Mexico | 040N | 009W | 30 | NE | Colorado |
| Commodity | Importance |
|---|---|
| Vanadium Critical | Primary |
| Uranium | Primary |
| Materials | Type of material |
|---|---|
| Carnotite | Ore |
| Roscoelite | Ore |
| Host or associated | Associated | ||||||
|---|---|---|---|---|---|---|---|
| Rock type | Volcanic Rock (Aphanitic) > Felsic Volcanic Rock > Rhyodacite | ||||||
| Rock unit name | Biotite Rhyodacite;Pyroxene Lamprophyre | ||||||
| Rock description | Biotite Rhyodacite;Pyroxene Lamprophyre | ||||||
| |||||||
| Host or associated | Associated |
|---|---|
| Rock type | Plutonic Rock > Porphyry > Lamprophyre |
| Host or associated | Host |
|---|---|
| Rock type | Sedimentary Rock > Clastic Sedimentary Rock > Sandstone |
| Rock unit name | Entrada Sandstone |
| Rock description | Entrada Sandstone |
| (1) | -107.89786, 37.71279 |
|---|
| Type of structure | Regional |
|---|---|
| Structure description | San Juan Uplift |
| Type of structure | Local |
| Structure description | Rico Dome, Unnamed Faults |
| Development status | Past Producer |
|---|---|
| Commodity type | Metallic |
| Deposit size | Small |
| Significant | No |
| Discovery year | 1945 |
| Discoverer | Vanadium Corporation Of America |
| Year of first production | 1947 |
| District name | Hermosa Peak Area |
|---|
| Ownership category | National Forest |
|---|---|
| Area name | San Juan N. F. |
| Type | Owner-Operator |
|---|---|
| Owner | Vanadium Corp. Of America |
| Home office | Durango, Co. |
| First year | 1967 |
| Year | 1971 | |||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Period | 1950-1971 | |||||||||||||||||||||
| Description | Cp_Grade: ^2.41% V2o5, 0.08% V3o8 (Graysill No.2) | |||||||||||||||||||||
| ||||||||||||||||||||||
| Year | 1971 | |||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Period | 1950-1971 | |||||||||||||||||||||
| Description | Cp_Grade: ^1.907% V2o5, 0.049% V3o8 (Graysill No. 1) | |||||||||||||||||||||
| ||||||||||||||||||||||
| Agency | Database name | Acronym | Record ID | Notes |
|---|---|---|---|---|
| USGS | Mineral Resources Data System | MRDS | D010795 | |
| U.S. Bureau of Mines | Minerals Availability System | MAS | 0081110194 |
CROSS, WHITMAN, AND HOLE, A.D., 1910, DESCRIPTION OF THE ENGINEER MOUNTAIN QUADRANGLE: USGS FOLIO 171.
COLORADO DIV. MINES INF. REPTS. AND ANNUAL OPERATOR REPTS.
PRATT, W.P., 1976, PRELIMINARY GEOLOGIC MAP OF THE HERMOSA PEAK QUADRANGLE, DOLORES, SAN JUAN, LA PLATA, AND MONTEZUMA COUNTIES, COLORADO: USGS OF-76-314.
COLO. DIV. MINES ANNUAL OPERATOR REPTS. (1950-1964 ANNUALS); NELSON-MOORE, 1978, P.398 (CUMULATIVES)
| Subject category | Comment text |
|---|---|
| Deposit | ROSCOELITE ORE AND POSSIBLY CARNOTITE ASSOCIATED WITH CARBON TRASH IN ESSENTIALLY FLAT-LYING ENTRADA SANDSTONE IN LAYER 2 TO 6 FT THICK. MINERALIZATION MAY HAVE BEEN INFLUENCED BY PROXIMITY OF SILLS AROUND HERMOSA MTN, SLIDEROCK RIDGE, AND WEST SIDE OF GRAYSILL MTN. FAULTS IN MINE AREA TREND N 20 AND 70 E. |
| Type | Date | Name | Affiliation | Comment |
|---|---|---|---|---|
| Reporter | 01-AUG-1983 | 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.