Mine detail: Chicago Mine

Previously called 'Blackbird Mine'

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Location

Lat / long:

45.12586, -114.3501

Resource(M)

Primary:	Cobalt
Secondary:	Gold, Copper
Tertiary:	Bismuth, Nickel
Ore:	Bismuth, Chalcocite, Chalcopyrite, Cobaltite, Gold, Safflorite
Gangue:	Biotite, Limonite, Magnetite, Pyrite, Pyrrhotite, Quartz, Vivianite
Orebody form:	IRREGULAR STRINGERS AND 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:	Gabbro
Associated type:	Gabbro
Structure:	Reverse Faults, Folds. Chicago Zone On Broad Syncline Plunging 43 Deg N
Alteration processes:	Chlorite

References

MRDS	W013486
MAS	160590070
DEP	10070520
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 R.I. 4012, P. 5}{Deposit:: BALDWIN, J.A., OCTOBER 8, 1976, PERSONAL COMMUNICATION.}{Deposit:: TREXLER, B.D., JR., 1974, UNPUBLISHED BLACKBIRD REPORT}{Deposit:: VHAY, J.S., 1948, COBALT-COPPER DEPOSITS OF THE BLACKBIRD DISTRICT, LEMHI COUNTY, IDAHO: USGS STRATEGIC MINERALS INV. PRELIM. REPORT 3-219, 26 P.}
Reporter	Ortman, Dale; Miller, Pat, Causey, J. Douglas