Mine detail: Pewabic Amygdaloid

Previously called 'Pewabic LodePewabic Amygdaloid Lode'

Location:	Houghton County, Michigan, United States, North America
Lat / long:	47.13333, -88.56672
dep_id:	10082606
mrds_id:	W060039
Commodity type:	metallic
Major mineral:	Copper
Minor mineral:	Silver
Operation type:	Underground
Production size:	Large ammount of material produced
Development status:	Past Producer
ore:	Copper, Silver
gangue:	Quartz, Calcite, Pumpellyite-(Mg), Epidote, Chlorite
orebody_fm:	AMYGDALOIDAL LODE
model:	96: Native Cu
alteration:	Oxidized and bleached
ore_ctrl:	Amygdaloidal flow tops
Reporter:	Nicholson, Suzanne, Sutphin, D.M., Mason Jr., G.T., Woodruff, Laurel G.
hrock_unit:	Portage Lake Volcanics
hrock_type:	Andesite
Structure:	Hancock fault
Year first produced:	1857
yr_lst_prd:	1931
prod_yrs:	VARIOUS MINES INTERMITTENTLY PRODUCED FROM THIS AMYGDALOID FROM 1857 AT LEAST THROUGH 1925. ALL REMAINING MINES IN DISTRICT CLOSED IN 1968
References:	Deposit:: BUTLER, B.S., AND BURBANK, W.S., 1929, THE COPPER DEPOSITS OF MICHIGAN: USGS PROF. PAPER NO. 144, 238 PP. 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, PP. 19-43 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., V. 1, P. 303-325 Deposit:: CORNWALL, H.R., AND WRIGHT, J.C., 1956, GEOLOGIC MAP OF THE HANCOCK QUADRANGLE, MICHIGAN: USGS MAP MF-46, SCALE 1:24000. 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, KEWEENAWAN COPPER DEPOSITS OF WESTERN UPPER MICHIGAN; AN OVERVIEW OF THE KEWEENAW PENINSULA NATIVE COPPER DISTRICT, MICHIGAN: GUIDEBOOK SERIES, VOL. 13, P. 33-62. Production:: WEEGE AND POLLACK, 1971 WHITE, 1968