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, Laumontite, Silver
Geology
Host rockBasalt · Portage Lake Volcanics
AlterationRemoval of hematite, copper replacement, quartz- pumpellyite bleaching
Economic & production
Development statusPast Producer
Identification
Deposit ID10080390
MRDS IDW031517
RegionNA
Data scoreB
Coordinates46.87528, -88.907
References
COPPER RANGE CO., UNPUBLISHED, 1968, BEDROCK GEOLOGY MAP OF THE WINONA (SW1/4) QUADRANGLE, HOUGHTON COUNTY, MICHIGAN.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., 19788 THE COPPER RESOURCES OF NORTHERN MICHIGAN; PREPARED FOR THE U.S. BUREAU OF MINES, CONTRACT NO. J0366067, 66P.BUTLER AND BURBANK (1929)