Mine detail: Graysill Mine

Location:	San Juan, Dolores County, Colorado, United States, North America
Lat / long:	37.71279, -107.89786
dep_id:	10014146
mrds_id:	D010795
Commodity type:	metallic
Major mineral:	Vanadium, Uranium
Operation type:	Unknown
Production size:	Small ammount of material produced
Development status:	Past Producer
ore:	Carnotite, Roscoelite
ore_ctrl:	Carbon Trash In Sandstone
Reporter:	Schwochow, Stephen D.
hrock_unit:	Entrada Sandstone
hrock_type:	Sandstone
arock_unit:	Biotite Rhyodacite;Pyroxene Lamprophyre
arock_type:	Rhyodacite,Lamprophyre
Structure:	San Juan Uplift, Rico Dome, Unnamed Faults
tectonic:	Central Cordillera (Southern Rocky Mtns)
Year first produced:	1947
disc_yr:	1945
discr:	Vanadium Corporation Of America
References:	Deposit:: NELSON-MOORE, J.L., AND OTHERS, 1978, RADIOACTIVE MINERAL OCCURRENCES OF COLORADO AND BIBLIOGRAPHY: CGS BULL. 40, P. 398. Deposit:: CROSS, WHITMAN, AND HOLE, A.D., 1910, DESCRIPTION OF THE ENGINEER MOUNTAIN QUADRANGLE: USGS FOLIO 171. Deposit:: FINCH, W.I., 1967, GEOLOGY OF EPIGENETIC URANIUM DEPOSITS IN SANDSTONE IN THE UNITED STATES: USGS PROF. PAPER 538, P. 141. Deposit:: COLORADO DIV. MINES INF. REPTS. AND ANNUAL OPERATOR REPTS. Deposit:: 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. Production:: COLO. DIV. MINES ANNUAL OPERATOR REPTS. (1950-1964 ANNUALS); NELSON-MOORE, 1978, P.398 (CUMULATIVES)