Commodities
PrimaryCopper
Commodity typeM
Deposit
Deposit typeSecondary Enrichment
Model96: Native Cu
Deposit sizeS
Ore controlConcentrated in shoots (stratigraphic in amygdaloid or fissure related)
Materials
Ore mineralsCopper
GangueQuartz, Calcite, Epidote, Pumpellyite-(Mg), Chlorite, Feldspar
Geology
Host rockBasalt · Portage Lake Volcanics
AlterationRemoval of hematite, quartz-pumpellyite bleaching, copper replacement
Economic & production
Development statusPast Producer
First production1908
Last production1918
Identification
Deposit ID10080381
MRDS IDW031507
RegionNA
Data scoreB
Coordinates46.78472, -89.0234
References
COPPER RANGE CO., UNPUBLISHED, 1968, BEDROCK GEOLOGY MAP OF THE GREENLAND (SE 1/4 QUADRANGLE, ONTONAGON COUNTY, MICHIGAN.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.)BUTLER, B.S., AND BURBANK, W.S., 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. 119, MICHIGAN DEPARTMENT OF NATURAL RESOURCES.BUTLER AND BURBANK (1929)