Mine detail: Brown Bear Mine

Previously called 'Blackbird Mine'

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Location

Lat / long:

45.12936, -114.35218

Resource(M)

Primary:	Cobalt
Secondary:	Copper, Gold
Tertiary:	Bismuth, Nickel, Silver
Ore:	Bismuth, Chalcocite, Chalcopyrite, Cobaltite, Gold
Gangue:	Magnetite, Pyrite, Pyrrhotite
Orebody form:	IRREGULAR PODS

Production

Operation type:	Unknown
Production size:	Small
Development status:	Past Producer
First production started:	1951

Geology

Host rock:	Belt Supergroup
Host type:	Schist
Associated rock:	Diabase, Diorite Dikes
Associated type:	Diorite,Diabase
Structure:	Reverse Faults, Folds, Schistosity. Zone On Anticlinal Structure Plunging 40 Deg N; Brown Bear Fault Striking N 55-70 Deg W And Dipping 55 Deg Ne Offsets Ore 80 Ft
Alteration processes:	Oxidation

References

MRDS	W013475
DEP	10105645
Reference	{Deposit:: UMPLEBY, J.B., 1913, GEOLOGY AND ORE DEPOSITS OF LEMHI COUNTY, IDAHO: USGS BULL. 528, 182 P.}{Deposit:: ANDERSON, A.L., 1943, PRELIMINARY REPORT ON THE COBALT DEPOSITS IN THE BLACKBIRD DISTRICT, LEMHI COUNTY, IDAHO: IDAHO BUREAU OF MINES AND GEOLOGY PAMPHLET 61, 34 P.}{Deposit:: CANNEY, F.C., 1953, PRELIMINARY REPORT OF GEOCHEMICAL INVESTIGATIONS IN THE BLACKBIRD DISTRICT, LEMHI COUNTY, IDAHO: USGS OPEN-FILE REPT.}{Deposit:: REED, G.C., AND HERDLICK, J.A., 1947, BLACKBIRD COBALT DEPOSITS, LEMHI COUNTY, IDAHO: USBM REPT. INV. 4012, P. 5}{Deposit:: 6) TREXLER, B.D., JR., 1974, UNPUBLISHED BLACKBIRD REPORT}{Deposit:: 1913 GEOLMAP UMPLEBY, J. B., BULL. 528}{Deposit:: 1943 RECON IDA. BUREAU OF MINES & GEOL. PAMPHLET 61.}{Deposit:: 1947 DIREXPL USBM, R.I. 4012}{Deposit:: 1953 GEOCHEM CANNEY, F.C., OPEN-FILE REPT}{Production:: BALDWIN, J.A., OCTOBER 8, 1976, PERSONAL COMMUNICATION.}
Reporter	Ortman, Dale; Miller, Pat