Deposit
Model96: Native Cu
Deposit sizeL
Orebody formLODE
Materials
Ore mineralsCopper
GangueQuartz, Pumpellyite-(Mg), Epidote, Calcite, Arsenical Copper, Chalcocite
Geology
Host rockBasalt · Portage Lake Volcanics
StructureBroad anticline
AlterationOxidized and bleached
Economic & production
Development statusPast Producer
Production yearsAT LEAST THROUGH 1925 BUT NOT LATER THAN 1968
First production1898
Identification
Deposit ID10106398
MRDS IDW060038
Alternate namesBaltic Lode, Baltic Amygdaloid Lode
RegionNA
Data scoreB
Coordinates47.06528, -88.63423
References
BULTER, B.S., AND BURBANK, W.S., 1929, THE COPPER DEPOSITS OF MICHIGAN: USGS PROF. PAPER NO. 144, 238 PP.WHITE, W.S., AND WRIGHT, J.C., 1956, GEOLOGIC MAP OF THE SOUTH RANGE QUADRANGLE, MICHIGAN: USGS MAP MF-48, SCALE 1:24000WHITE, W.S., 1956, GEOLOGIC MAP OF THE CHASSELL QUADRANGLE, MICHIGAN: USGS MAP MF-43, SCALE 1;24000WHITE, 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, P. 303-325WEEGE, 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. 18-43.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, AN OVERVIEW OF THE KEWEENAW PENINSULA NATIVE COPPER DISTRICT, MICHIGAN: IN T.J.BORNHORST(EDITOR) KEWEENAWAN COPPER DEPOSITS OF WESTERN UPPER MICHIGAN: SOC. ECON. GEOL., GUIDEBOOK SERIES, VOL. 13, P. 33-62.WEEGE AND POLLACK, 1971; WHITE, 1968