Commodities
PrimaryCopper
Commodity typeM
Deposit
Deposit typeLode
Model96: Native Cu
Deposit sizeM
Orebody formTABULAR
Ore controlConglomerate bed between amygdaloid basalt flows.
Materials
Ore mineralsCopper
GangueEpidote
Geology
Host rockConglomerate,Basalt · "Allouez Conglomerate", "Kearsarge Amygdaloid"
StructureFelsic conglomerate
AlterationAlteration associated with the copper mineralization is a pronounced bleaching of the conglomerate from a brownish red to a light pink or salmon color. the color change resulted from the removal of a part, often a large part, of the hematite of the conglomerate with no very pronounced change in the other minerals.
Economic & production
Development statusPast Producer
Production years1869, 1873-1893 (ALLOUEZ CONGLOMERATE); 1905-1920 (KEARSARGE AMYGDALOID).
First production1869
Last production1923
Identification
Deposit ID10082861
MRDS IDW062222
RegionNA
Data scoreB
Coordinates47.28917, -88.41172
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 AND BURBANK , 1929, P. 77.