Commodities
PrimaryCopper
SecondarySilver
Commodity typeM
Deposit
Deposit typeSecondary Enrichment
Model96: Native Cu
Deposit sizeL
Orebody formIRREGULAR
Ore controlConcentrated in shoots (stratigraphic in amygdaloid or fissure related).
Materials
Ore mineralsCopper, Silver
GangueQuartz, Calcite, Epidote, Pumpellyite-(Mg), Chlorite, Feldspar, Datolite, Laumontite
Geology
Host rockBasalt · Portage Lake Volcanics
StructureSyncline, Mass anticline
AlterationRemoval of hematite, copper replacement; quartz-pumpellyite bleaching
Economic & production
Development statusPast Producer
First production1851
Last production1917
Discovery year1850
Identification
Deposit ID10106199
MRDS IDW031520
RegionNA
Data scoreB
Coordinates46.77333, -89.07285
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COPPER RANGE CO., UNPUBLISHCOPPER RANGE CO., UNPUBLISHED, 1968, BEDROCK GEOLOGY MAP OF THE GREENLAND (SE 1/4) QUADRANGLE, ONTONAGON COUNTY, MICHIGAN.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. J0366067, 66P.JOHNSON, A.M., AND GROTH, E.H.,1998, INVENTORY OF UNDERGROUND MINES, ONTONAGON COUNTY, P. 1-6, MICHIGAN DEPARTMENT OF NATURAL RESOURCES.BUTLER AND BURBANK (1929)