Mine detail: Baltic Amygdaloid

Previously called 'Baltic LodeBaltic Amygdaloid Lode'

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Location

Lat / long: 47.06528, -88.63423

Resource(M)

Primary: Copper
Ore: Copper
Gangue: Quartz, Pumpellyite-(Mg), Epidote, Calcite, Arsenical Copper, Chalcocite
Orebody form: LODE

Production

Operation type: Underground
Production size: Large
Development status: Past Producer
Production years: AT LEAST THROUGH 1925 BUT NOT LATER THAN 1968
First production started: 1898

Geology

Host rock:Portage Lake Volcanics
Host type:Basalt
Structure:Broad anticline
Alteration processes:Oxidized and bleached

References

MRDSW060038
DEP10106398
Reference{Deposit:: BULTER, B.S., AND BURBANK, W.S., 1929, THE COPPER DEPOSITS OF MICHIGAN: USGS PROF. PAPER NO. 144, 238 PP.}{Deposit:: WHITE, W.S., AND WRIGHT, J.C., 1956, GEOLOGIC MAP OF THE SOUTH RANGE QUADRANGLE, MICHIGAN: USGS MAP MF-48, SCALE 1:24000}{Deposit:: WHITE, W.S., 1956, GEOLOGIC MAP OF THE CHASSELL QUADRANGLE, MICHIGAN: USGS MAP MF-43, SCALE 1;24000}{Deposit:: 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, P. 303-325}{Deposit:: 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. 18-43.}{Deposit:: BODWELL, W.A., 1972, GEOLOGIC COMPILATION AND NONFERROUS METAL POTENTIAL, PRECAMBRIAN SECTION, NORTHERN MICHIGAN: HOUGHTON, MICHIGAN TECHNOLOGICAL UNIVERSITY, M.S. THESIS, 98 P.}{Deposit:: 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.}{Production:: WEEGE AND POLLACK, 1971; WHITE, 1968}
ReporterNicholson, Suzanne, Sutphin, D.M., Mason Jr., G.T., Woodruff, Laurel G.