Commodities
PrimaryCopper
SecondarySilver
Commodity typeM
Deposit
Model96: Native Cu
Deposit sizeL
Orebody formAMYGDALOIDAL LODE
Ore controlAmygdaloidal flow tops
Materials
Ore mineralsCopper, Silver
GangueQuartz, Calcite, Pumpellyite-(Mg), Epidote, Chlorite
Geology
Host rockAndesite · Portage Lake Volcanics
StructureHancock fault
AlterationOxidized and bleached
Economic & production
Development statusPast Producer
Production yearsVARIOUS MINES INTERMITTENTLY PRODUCED FROM THIS AMYGDALOID FROM 1857 AT LEAST THROUGH 1925. ALL REMAINING MINES IN DISTRICT CLOSED IN 1968
First production1857
Last production1931
Identification
Deposit ID10082606
MRDS IDW060039
Alternate namesPewabic Lode, Pewabic Amygdaloid Lode
RegionNA
Data scoreB
Coordinates47.13333, -88.56672
References
BUTLER, B.S., AND BURBANK, W.S., 1929, THE COPPER DEPOSITS OF MICHIGAN: USGS PROF. PAPER NO. 144, 238 PP.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, PP. 19-43WHITE, 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., V. 1, P. 303-325CORNWALL, H.R., AND WRIGHT, J.C., 1956, GEOLOGIC MAP OF THE HANCOCK QUADRANGLE, MICHIGAN: USGS MAP MF-46, SCALE 1:24000.BODWELL, W.A., 1972, GEOLOGIC COMPILATION AND NONFERROUS METAL POTENTIAL, PRECAMBRIAN SECTION, NORTHERN MICHIGAN: HOUGHTON, MICHIGAN TECHNOLOGICAL UNIVERSITY, M.S. THESIS, 98 P.BORNHORST, THEODORE J., 1992, KEWEENAWAN COPPER DEPOSITS OF WESTERN UPPER MICHIGAN; AN OVERVIEW OF THE KEWEENAW PENINSULA NATIVE COPPER DISTRICT, MICHIGAN: GUIDEBOOK SERIES, VOL. 13, P. 33-62.WEEGE AND POLLACK, 1971 WHITE, 1968