Commodities
PrimaryCopper
SecondarySilver
Commodity typeM
Deposit
Deposit typeLode
Model96: Native Cu
Deposit sizeS
Orebody formTABULAR
Ore controlAmygdaloidal flow top
Materials
Ore mineralsCopper
GangueFeldspar, Epidote
Geology
Host rockBasalt · "Kearsarge Amygdaloid", "Portage Lake Volcanics"
StructureOphitic flow with distinctive plagioclase phenocrysts in the upper portion.
AlterationEpidote, red feldspar
Economic & production
Development statusPast Producer
Identification
Deposit ID10082869
MRDS IDW062232
RegionNA
Data scoreB
Coordinates47.24528, -88.43311
References
BUTLER, B.S., AND BURBANK, W.S., 1929, THE COPPER DEPOSITS OF MICHIGAN: USGS PROF PAPER NO. 144, 238 PP.CORNWALL, H.R., AND WRIGHT, J.C., 1956, GEOLOGIC MAP OF THE LAURIUM QUADRANGLE, MICHIGAN: USGS MAP MF-47, SCALE 1:24000.BUTLER, B.S., AND BURBANK, W.S., 1929, P. 88.