Mine detail: Michigan Mine

Previously called ''

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Location

Lat / long: 46.73083, -89.15785

Resource(M)

Primary: Copper
Secondary: Silver
Ore: Copper, Silver
Gangue: Quartz, Calcite, Epidote, Pumpellyite-(Mg), Chlorite, Feldspar
Orebody form: IRREGULAR

Production

Operation type: Underground
Deposit type: Secondary Enrichment
Production size: Large
Development status: Past Producer
First production started: 1898
Last production ended: 1921

Geology

Host rock:Portage Lake Volcanics
Host type:Basalt
Alteration processes:Removal of hematite, copper replacement, quartz-pumpellyite bleaching

References

MRDSW031528
DEP10080399
Reference{Deposit:: COPPER RANGE CO., UNPUBLISHED, 1968, BEDROCK GEOLOGY MAP OF THE ROCKLAND (NW 1/4) QUADRANGLE, ONTONAGON COUNTY, MICHIGAN. GEOLOGY MAPPED AND COMPILED BY COPPER RANGE EXPLORATION CO., INC., AND BY H. HUBBARD (U.S.G.S.)}{Deposit:: BUTLER, B.S., AND BURBANK, W.S., 1929, THE COPPER DEPOSITS OF MICHIGAN: U.S. GEOLOGICAL SURVEY PROF. PAPER 144, 238P.}{Deposit:: WILBAND, J.T., 1978, THE COPPER RESOURCES OF NORTHERN MICHIGAN; PREPARED FOR THE U.S. BUREAU OF MINES, CONTRACT NO. J0366067, 66P.}{Deposit:: STATE OF MICHIGAN TAX COMMISSION, 1930, APPRAISAL OF IRON AND COPPER MINES OF MICHIGAN; COMPILED ANNUALLY BY THE STATE TAX COMMISSION AND THE DEPARTMENT OF CONSERVATION, LOCATED AT THE GEOLOGICAL SURVEY DIVISION OF THE DEPT. OF NATURAL RESOURCES, LANSING, MICHIGAN.}{Deposit:: JOHNSON, A.M., AND GROTH, E.H., 1998, INVENTORY OF UNDERGROUND MINES, ONTONAGON COUNTY, P. 164-172, MICHIGAN DEPARTMENT OF NATURAL RESOURCES.}{Production:: BUTLER AND BURBANK (1929)}
ReporterAnderson, Arlene (M. Gere), Yeager, Keith (Cannon, W.), Sutphin, D.M., Mason Jr., G.T.