Commodities
PrimaryCopper
SecondarySilver
Commodity typeM
Deposit
Deposit typeSecondary Enrichment
Model96: Native Cu
Deposit sizeL
Orebody formTABULAR FISSURE
Ore controlConcentrated in shoots (stratigraphic in amygdaloid or fissure related)
Materials
Ore mineralsCopper, Silver
GangueQuartz, Calcite, Epidote, Pumpellyite-(Mg), Chlorite, Feldspar
Geology
Host rockBasalt · Portage Lake Volcanics
AlterationRemoval of hematite, copper replacement, quartz-pumpellyite bleaching
Economic & production
Development statusPast Producer
First production1848
Last production1908
Identification
Deposit ID10106197
MRDS IDW031505
RegionNA
Data scoreB
Coordinates46.72722, -89.18674
References
COPPER RANGE CO., UNPUBLISHED, 1968, BEDROCK GEOLOGY MAP OF THE ROCKLAND (NW1/4) QUADRANGLE, ONTONAGON COUNTY, MICHIGAN GEOLOGY MAPPED AND COMPILED BY COPPER RANGE EXPLORATION CO., INC.,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. 183-187, MICHIGAN DEPARTMENT OF NATURAL RESOURCES.BUTLER AND BURBANK (1929)