Mine detail: Caledonia Mine (Nebraska)

Previously called 'Flintsteel '

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Location

Lat / long: 46.75139, -89.11924

Resource(M)

Primary: Copper
Secondary: Silver
Ore: Copper, Silver
Gangue: Quartz, Calcite, Epidote, Pumpellyite-(Mg), Chlorite, Feldspar
Orebody form: IRREGULAR
Discovery year: 1855

Production

Operation type: Underground
Deposit type: Secondary Enrichment
Production size: Large
Development status: Producer
First production started: 1863

Geology

Host rock:Portage Lake Volcanics
Host type:Basalt
Alteration processes:Removal of hematite, copper replacement, quartz-pumpellyite bleaching

References

MRDSW031529
DEP10080400
Reference{Deposit:: COPPER RANGE CO., UNPUBLISHCOPPER RANGE CO., UNPUBLISHED, 1968, BEDROCK GEOLOGY MAP OF THE GREENLAND (SE 1/4) QUADRANGLE, ONTONAGON COUNTY, MICHIGAN. GEOLOGY MAPPED AND COMPILED BY COPPER RANGE EXPLORATION CO., INC., AND BY H. HUBBARD (U.S.G.S.)}{Deposit:: BUTLER, B.S., AND BURBANK, W.S., 1929, THE COPPER DEPOSITS OF MICHIGAN: U.S. GEOLOGICAL SURVEY PROF. PAPER 144, 238P.}{Deposit:: WILBAND J.T., 1978, THE COPPER RESOURCES OF NORTHERN MICHIGAN; PREPARED FOR THE U.S. BUREAU OF MINES, CONTRACT NO. J0366067, 66P.}{Deposit:: STATE OF MICHIGAN TAX COMMISSION, 1952-1958, APPRAISAL OF IRON AND COPPER MINES OF MICHIGAN; COMPILED ANNUALLY BY THE STATE TAX COMMISSION AND THE DEPARTMENT OF CONSERVATION, LOCATED AT THE GEOLOGICAL SURVEY DIVISION OF THE DEPARTMENT OF NATURAL RESOURCES, LANSING, MICHIGAN.}{Deposit:: JOHNSON, A.M., AND GROTH, E.H., 1998, INVENTORY OF UNDERGROUND MINES, ONTONAGON COUNTY, P 28-32, MICHIGAN DEPARTMENT OF NATURAL RESOURCES,}{Production:: BUTLER AND BURBANK (1929)}
ReporterYeager, Keith (Cannon, W.), Sutphin, D.M., Mason Jr., G.T., Anderson, Arlene (M. Gere)