Mine detail: Baltic Amygdaloid

Previously called 'Baltic LodeBaltic Amygdaloid Lode'

Location:	Houghton County, Michigan, United States, North America
Lat / long:	47.06528, -88.63423
dep_id:	10106398
mrds_id:	W060038
Commodity type:	metallic
Major mineral:	Copper
Operation type:	Underground
Production size:	Large ammount of material produced
Development status:	Past Producer
ore:	Copper
gangue:	Quartz, Pumpellyite-(Mg), Epidote, Calcite, Arsenical Copper, Chalcocite
orebody_fm:	LODE
model:	96: Native Cu
alteration:	Oxidized and bleached
Reporter:	Nicholson, Suzanne, Sutphin, D.M., Mason Jr., G.T., Woodruff, Laurel G.
hrock_unit:	Portage Lake Volcanics
hrock_type:	Basalt
Structure:	Broad anticline
Year first produced:	1898
prod_yrs:	AT LEAST THROUGH 1925 BUT NOT LATER THAN 1968
References:	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