Connecticut Fissure

Keweenaw County, Michigan, United States

Copper

Land & claims · BLM · live

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BLM MLRS ↗Claims at this point ↗Surface mgmt ↗

Surface manager + active mining claims at this point, live from BLM. The "open to location" notes are a general 1872-Mining-Law guide, not BLM output — decision-support only; verify with BLM MLRS and on the ground before staking or entry.

Commodities

PrimaryCopper

Commodity typeMetallic

Deposit

Model96: Native Cu

Deposit sizeSmall

Materials

Ore mineralsCopper

Geology

Host rockBasalt · Portage Lake Volcanics

StructureJust south of Greenstone flow

Economic & production

Development statusPast Producer

Production yearsPRIOR TO 1860

Community notes

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References

BUTLER, B.S., AND BURBANK, W.S., 1929, THE COPPER DEPOSITS OF MICHIGAN: USGS PROF. PAPER NO. 144, 238 PP.CORNWALL, H.R., 1954, BEDROCK GEOLOGY OF THE DELAWARE QUADRANGLE, MICHIGAN: USGS MAP GQ-51, SCALE 1:24000BUTLER AND BURBANK, 1929

Identification

Deposit ID10082623

MRDS IDW060061

RegionNA

Data scoreC

Coordinates47.425, -88.11671