Commodities
PrimaryCopper
Commodity typeM
Deposit
Model96: Native Cu
Deposit sizeS
Orebody formAMYGDALOIDAL LODE
Ore controlFragmental flow top
Materials
Ore mineralsCopper
GangueCalcite, Prehnite
Geology
Host rockBasalt · Portage Lake Volcanics
StructureAmygdaloidal flow top
AlterationOxidized and bleached
Economic & production
Development statusPast Producer
Last production1968
Discovery year1942
Identification
Deposit ID10082610
MRDS IDW060045
Alternate namesIroquis Lode, Iroquois Amygdaloid Lode
RegionNA
Data scoreB
Coordinates47.31667, -88.36255
References
WEEGE, R.J., AND POLLACK, J.P., 1971, RECENT DEVELOPMENTS IN THE NATIVE COPPER DISTRICT OF MICHIGAN: IN W.S. WHITE, (EDITOR) GUIDEBOOK FOR FIELD CONFERENCE, MICHIGAN COPPER DISTRICT, SEPT. 30-OCT. 2, 1971, SOC. ECON. GEOL., P. 19-43.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); AM. INSTIT. MIN. METALL. PETROL. ENG., V. 1, P. 303-325.DAVIDSON, E.S, ESPENSHADE, G.H., WHITE, W.S., AND WRIGHT, J.C., 1955, BEDROCK GEOLOGY OF THE MOHAWK QUADRANGLE, MICHIGAN: USGS MAP GQ-54, SCALE 1:24000WEEGE AND POLLACK, 1971; WHITE, 1968