Commodities
PrimaryCopper
SecondarySilver
TertiaryArsenic
Commodity typeM
Materials
Ore mineralsCopper, Silver
GangueCalcite, Quartz, Analcime, Apophyllite, Barite, Prehnite, Epidote, Pumpellyite-(Mg), Datolite, Adularia
Geology
Host rockBasalt · Portage Lake Volcanics
StructureSyncline
Economic & production
Development statusPast Producer
First production1890
Discovery year1845
Identification
Deposit ID10310197
MRDS IDLW00197
Alternate namesFissure Deposits
RegionNA
Data scoreB
Coordinates47.3675, -88.3231
References
WILSON, M.L. AND DYL, S.J., III, 1992, THE MICHIGAN COPPER COUNTRY: MINERALOGICAL RECORD, V. 23, P. 1-76.BUTLER, R.S. AND BURBANK, W.S., 1929, THE COPPER DEPOSITS OF MICHIGAN: U.S. GEOLOGICAL SURVEY PROFESSIONAL PAPER 144, 238 P.WHITE, W.S., 1968, THE NATIVE COPPER DEPOSITS OF NORTHERN MICHIGAN: IN J.D. RIDGE, (EDITOR), ORE DEPOSITS OF THE UNITED STATES (1933-1967) (GRATON-SALES VOLUME): AM. INSTIT. MIN. METALL. PETROL. ENG., VOL. 1, 303-325.WHITE, 1968