Mine detail: Calumet and Hecla Conglomerate Lode

Previously called 'C & H Conglomerate'

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Location

Lat / long: 47.24583, -88.45005

Resource(M)

Primary: Copper
Ore: Copper
Gangue: Calcite, Quartz, Epidote, Feldspar, Barite, Chlorite, Pumpellyite-(Mg)
Orebody form: CONGLOMERATE LODE
Discovery year: 1864

Production

Operation type: Underground
Production size: Large
Development status: Past Producer
Production years: ESSENTIALLY ACTIVE CONTINUOUSLY UNTIL CENTENNIAL #3-#6 WAS SHUT DOWN IN 1968
First production started: 1865
Last production ended: 1968

Geology

Host rock:Portage Lake Volcanics
Host type:Conglomerate,Sandstone
Structure:C & H conglomerate lode can be traced for a distance of more than 40 miles.
Alteration processes:Locally epidote lenses

References

MRDSW060036
DEP10082604
Reference{Deposit:: BUTLER, B.S., AND BURBANK, W.S,. 1929, THE COPPER DEPOSITS OF MICHIGAN: USGS PROF. PAPER NO. 144, 238 PP.}{Deposit:: WHITE, W.S., 1968, THE NATIVE COPPER DEPOSITS OF NORTHERN MICHIGAN: IN J.D. RIDGE, (EDITOR), ORE DEPOSITS OF THE UNITED STATES, 193301967 (GRATON-SALES VOLUME): AM. INSTIT. MIN. METALL. PETROL. ENG., VOL.1, P. 303-325.}{Deposit:: WEEGE, J.J., AND POLLACK, J.P., 19971, 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. 19-43}{Deposit:: WHITE, W.S., CORNWALL, H.R., AND SWANSON, R.W., 1953, BEDROCK GEOLOGY OF THE AHMEEK QUADRANGLE; USGS MAP GQ-27, SCALE 1:24000}{Deposit:: CORNWALL, H.R., AND WRIGHT, J.C., 1956, GEOLOGIC MAP OF THE LAURIUM QUADRANGLE, MICHIGAN: USGS MAP MF-47, 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:: WHITE, 1968 WEEGE AND POLLACK, 1971}
ReporterNicholson, Suzanne, Sachiko Tanikawa, Sutphin, D.M., Mason Jr., G.T., Woodruff, Laurel G.