Commodities
PrimaryCopper
Commodity typeM
Deposit
Model96: Native Cu
Deposit sizeS
Geology
Host rockBasalt · Portage Lake Volcanics
StructureFissure crossing Greenstone flow - mines on south side of Greenstone flow
Economic & production
Development statusPast Producer
First production1854
Last production1898
Identification
Deposit ID10082614
MRDS IDW060051
Alternate namesCentral Fissure
RegionNA
Data scoreB
Coordinates47.4, -88.20004
References
BUTLER, B.S., AND BURBANK, W.S., 1929, THE COPPER DEPOSITS OF MICHIGAN: USGS PROF. PAPER NO. 144, 238 PP.CORNWALL, H.R, AND WRIGHT, J.C., 1954, BEDROCK GEOLOGY OF THE EAGLE HARBOR QUADRANGLE, MICHIGAN: USGS MAP GQ-36, SCALE 1:24000JOHNSON, A.M. AND GROTH, E.H., 1998, INVENTJOHNSON, A.M. AND GROTH, E.H., 1998, INVENTORY OF UNDERGROUND MINES, KEWEENAW COUNTY, SITE ID 420015, MICHIGAN DEPARTMENT OF NATURAL RESOURCES.BUTLER AND BURBANK, 1929