Mine detail: Brown Bear Mine

Previously called ''

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Location

Lat / long:

37.55084, -108.16148

Resource(M)

Primary:	Copper
Ore:	Chalcocite, Malachite
Gangue:	Calcite, Limonite, Pyrite
Discovery year:	1882

Production

Operation type:	Underground
Production size:	None
Development status:	Prospect

Geology

Host rock:	Dolores Formation
Host type:	Shale,Sandstone
Associated rock:	Porphyritic Rocks--Monzonite Porphyry
Associated type:	Monzonite
Structure:	San Juan Uplift, Four Corners Platform, La Plata Dome
Tectonic:	Central Cordillera (Southern Rocky Mtns)
Alteration processes:	Hydrothermal Alteration, Bleaching

References

MRDS	D009281
MAS	80837003
DEP	10013143
Reference	GODDARD, E.N., 1949, COPPER DEPOSITS OF THE BEAR CREEK DISTRICT, IN ECKEL, E.B., 1949, GEOLOGY AND ORE DEPOSITS OF THE LA PLATA DISTRICT, COLORADO: USGS PROF. PAPER 219, P. 70-72, 98 , PL. 13, #3.
Reporter	Wilson, Anna B., Collins, Donna B., Schwochow, Stephen D.