Commodities
PrimaryCopper
Commodity typeM
Deposit
Deposit typeSecondary Enrichment
Model96: Native Cu
Deposit sizeL
Ore controlConcentrated in shoots (stratigraphic in amygdaloid or fissure related).
Materials
Ore mineralsCopper
GangueQuartz, Calcite, Epidote, Pumpellyite-(Mg), Chlorite, Feldspar, Prehnite
Geology
Host rockBasalt · Portage Lake Volcanics
AlterationRemoval of hematite, copper replacement, quartz-pumpellyite bleaching
Economic & production
Development statusPast Producer
First production1849
Last production1924
Identification
Deposit ID10080387
MRDS IDW031514
Alternate namesCushin
RegionNA
Data scoreB
Coordinates46.69972, -89.23202
References
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 UNPUBLISHED, 1968, BEDROCK GEOLOGY MAP OF THE ROCKLAND (NW 1/4 ) QUADRANGLE, ONTONAGON COUNTY, MICHIGAN.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.)BUTLER, B.S., AND BURBANK, W.S., 1929. THE COPPER DEPOSITS OF MICHIGAN: U.S. GEOLOGICAL SURVEY PROF. PAPER 144, 238P.WILBAND, J.T., 1978, THE COPPER RESOURCES OF NORTHERN MICHIGAN; PREPARED FOR THE U.S. BUREAU OF MINES, CONTRACT NO. J0366067, 66P.JOHNSON, A.M., AND GROTH, E.H., 1998, INVENTORY OF UNDERGROUND MINES, ONTONAGON COUNTY, P. 244-250, MICHIGAN DEPARTMENT OF NATURAL RESOURCES.BUTLER AND BURBANK (1929)