Commodities
PrimaryCopper
SecondarySilver
Commodity typeM
Deposit
Deposit typeLode
Model96: Native Cu
Deposit sizeS
Orebody formTABULAR
Ore controlConglomerate bed between amygdaloid basalt flows.
Materials
Ore mineralsCopper
GangueFeldspar, Epidote, Quartz, Calcite, Prehnite, Pumpellyite-(Mg), Datolite
Geology
Host rockConglomerate,Basalt · "Calumet And Hecla Conglomerate", "Kearsarge Amygdaloid", "Osceola Amygdaloid"
StructureThe Kearsarge amygdaloid is an ophitic flow with plagioclase phenocrysts in
Economic & production
Development statusPast Producer
Production years1869-1874, 1882, 1891-1892, 1894-1902, 1904-1911.
First production1869
Last production1920
Identification
Deposit ID10082863
MRDS IDW062226
Alternate namesSchoolcraft
RegionNA
Data scoreB
Coordinates47.25583, -88.42255
References
BUTLER, B.S., AND BURBANK, W.S., 1929, THE COPPER DEPOSITS OF MICHIGAN: USGS PROF PAPER NO. 144, 238 PP.WHITE, W.S., CORNWALL, H.R., AND SWANSON, R.W., 1953, BEDROCK GEOLOGY OF THE AHMEEK QUADRANGLE; USGS MAP GQ-27, SCALE 1:24000BUTLER, B.S., AND BURBANK, W.S., 1929, 81-82BUTLER, B.S., AND BURBANK, W.S., 1929, 81-82.