Mine detail: Old Mass Mine

Previously called ''

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Location

Lat / long: 46.75583, -89.11285

Resource(M)

Primary: Copper
Ore: Copper
Gangue: Quartz, Calcite, Epidote, Pumpellyite-(Mg), Chlorite, Feldspar, Datolite, Silver
Orebody form: IRREGULAR
Discovery year: 1849

Production

Operation type: Underground
Deposit type: Secondary Enrichment
Production size: Small
Development status: Past Producer
First production started: 1849
Last production ended: 1884

Geology

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

References

MRDSW031527
DEP10080398
Reference{Deposit:: COPPER RANGE CO., UNPUBLISHCOPPER RANGE CO., UNPUBLISHED, 1968, BEDROCK GEOLOGY MAP OF THE GREENLAND (SE 1/4) QUADRANGLE, ONTONAGON COUNTY, MICHIGAN.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 MINES OF MICHIGAN; COMPILED ANNUALLY BY THE STATE TAX COMMISSION AND THE DEPARTMENT OF CONSERVATION, LOCATED AT THE GEOLOGICAL SURVEY DIVISION OF THE DEPARTMENT OF NATURAL RESOURCES, LANSING, MICHIGAN.}{Deposit:: JOHNSON, A.M., AND GROTH, E.H.,1998, INVENTORY OF UNDERGROUND MINES, ONTONAGON COUNTY, P. 144-148, MICHIGAN DEPARTMENT OF NATURAL RESOURCES.}
ReporterYeager, Keith (Cannon, W.), Sutphin, D.M., Mason Jr., G.T., Anderson, Arlene (M. Gere)