Mine detail: Gem Mine

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Location:	Fremont County, Colorado, United States, North America
Lat / long:	38.27557, -105.54669
dep_id:	10013400
mrds_id:	D009670
Commodity type:	metallic
Major mineral:	Nickel
Minor mineral:	Silver, Cobalt, Copper
Operation type:	Underground
Production size:	Small ammount of material produced
Development status:	Past Producer
ore:	Annabergite, Chalcocite, Niccolite, Silver, Bornite, Chalcopyrite
gangue:	Calcite, Dolomite, Magnetite, Pyrite, Quartz, Sphalerite
work_type:	Unknown
model:	27: Alkaline complexes
ore_ctrl:	Faults, Fault Intersections; Shear Zones; Carbonatite Dikes
Reporter:	Collins, Donna B.
hrock_type:	Gabbro,Pyroxenite
arock_unit:	Carbonatite Dike (Dolomite-Barite-Monazite);Pyroxenite
arock_type:	Gabbro,Pyroxenite
Structure:	Northern Wet Mountains, Canon City Embayment, Thirtynine Mile Volcanic Field, Ne-Trending Faults, Gem Park Complex
tectonic:	Central Cordillera (Southern Rocky Mountains)
yfp_ba:	<
Year first produced:	1885
References:	Deposit:: COKER, R. J., 1982, MINERAL RESOURCES OF THE ARKANSAS CANYON PLANNING UNIT WITH SPECIAL EMPHASIS ON THE FORMER GRAPE CREEK WILDERNESS STUDY AREAS AND THE MCINTYRE HILLS WILDERNESS STUDY AREA: US BLM MINERAL REPORT, 125 P. Deposit:: TAYLOR, R. B., SCOTT, G. R., WOBUS, R. A. AND EPIS, R. C., 1975, RECONNAISSANCE GEOLOGIC MAP OF THE COTOPAXI 15-MINUTE QUADRANGLE, FREMONT AND CUSTER COUNTIES, COLORADO: USGS MAP -900, 1:62,500. Deposit:: PARKER, R. L. AND SHARP, W. N., 1970, MAFIC-ULTRAMAFIC IGNEOUS ROCKS AND ASSOCIATED CARBONATITES OF THE GEM PARK COMPLEX, CUSTER AND FREMONT COUNTIES, COLORADO: USGS PROF PAPER 649, 24 P. Deposit:: ARGALL, PHILIP, 1893, NICKEL; OCCURRENCE, GEOLOGICAL DISTRIBUTION AND GENESIS OF ORE DEPOSITS, WITH DISCUSSION BY THOMAS CHARLTON: COLORADO SCIENTIFIC SOCIETY PROCEEDINGS, V. 4, P. 419-421 Deposit:: 5) CROSS, WHITMAN, 1884, A LIST OF SPECIALLY NOTEWORTHY MINERALS OF COLORADO: COLORADO SCIENTIFIC SOCIETY PROCEEDINGS, V. 1, P. 134 Deposit:: 6) ECKEL, E.B., 1961, MINERALS OF COLORADO-A 100-YEAR RECORD: USGS BULLETIN 1114, P. 20, 55, 242.