Michigan · Houghton County
Past Producer

Calumet and Hecla Conglomerate Lode

Houghton County, Michigan, United States
Copper
⌖ Show on mapUSGS source ↗
Commodities
PrimaryCopper
Commodity typeM
Deposit
Model96: Native Cu
Deposit sizeL
Orebody formCONGLOMERATE LODE
Ore controlPermeability and thickness of conglomerate unit
Materials
Ore mineralsCopper
GangueCalcite, Quartz, Epidote, Feldspar, Barite, Chlorite, Pumpellyite-(Mg)
Geology
Host rockConglomerate,Sandstone · Portage Lake Volcanics
StructureC & H conglomerate lode can be traced for a distance of more than 40 miles.
AlterationLocally epidote lenses
Economic & production
Development statusPast Producer
Production yearsESSENTIALLY ACTIVE CONTINUOUSLY UNTIL CENTENNIAL #3-#6 WAS SHUT DOWN IN 1968
First production1865
Last production1968
Discovery year1864
Identification
Deposit ID10082604
MRDS IDW060036
Alternate namesC & H Conglomerate
RegionNA
Data scoreB
Coordinates47.24583, -88.45005
References
BUTLER, B.S., AND BURBANK, W.S,. 1929, THE COPPER DEPOSITS OF MICHIGAN: USGS PROF. PAPER NO. 144, 238 PP.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.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. 19-43WHITE, W.S., CORNWALL, H.R., AND SWANSON, R.W., 1953, BEDROCK GEOLOGY OF THE AHMEEK QUADRANGLE; USGS MAP GQ-27, SCALE 1:24000CORNWALL, H.R., AND WRIGHT, J.C., 1956, GEOLOGIC MAP OF THE LAURIUM QUADRANGLE, MICHIGAN: USGS MAP MF-47, SCALE 1:24000.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, KEWEENAWAN COPPER DEPOSITS OF WESTERN UPPER MICHIGAN; AN OVERVIEW OF THE KEWEENAW PENINSULA NATIVE COPPER DISTRICT, MICHIGAN: GUIDEBOOK SERIES, VOL. 13, P. 33-62.WHITE, 1968 WEEGE AND POLLACK, 1971