Commodities
PrimaryCopper
Commodity typeM
Deposit
Deposit typeSecondary Enrichment
Model96: Native Cu
Deposit sizeS
Ore controlConcentrated in shoots (stratigraphic in amygdaloid)
Materials
Ore mineralsCopper
GangueQuartz, Calcite, Epidote, Pumpellyite-(Mg), Feldspar, Chlorite, Silver, Tenorite, Atacamite, Malachite, Chrysocolla, Melaconite
Geology
Host rockBasalt · Portage Lake Volcanics
AlterationRemoval of hematite, copper replacement, quartz-pumpellyite bleaching
Economic & production
Development statusPast Producer
First production1910
Last production1956
Identification
Deposit ID10080402
MRDS IDW031532
RegionNA
Data scoreB
Coordinates46.76139, -89.04007
References
COPPER RANGE CO., UNPUBLISHCOPPER RANGE CO., UNPUBLISHED, 1968, BEDROCK GEOLOGY MAP OF THE GREENLAND (SE 1/4) QUADRANGLE, ONTONAGON COUNTY, MICHIGAN.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.)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. J036067, 66P.JOHNSON, A.M., AND GROTH, E.H., 1998, INVENTORY OF UNDERGROUND MINES, ONTONAGON COUNTY, P 7-11, MICHIGAN DEPARTMENT OF NATURAL RESOURCES.BUTLER AND BURBANK (1929)