Mine detail: Northwestern Fissure

Previously called ''

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Location

Lat / long:

47.4, -88.19171

Resource(M)

Primary:	Copper
Ore:	Copper

Production

Operation type:	Surface
Production size:	Small
Development status:	Past Producer
Production years:	1845-1857; DISCONTINUOUSLY AFTER THAT
First production started:	1845
Last production ended:	1880

Geology

Host rock:	Portage Lake Volcanics
Host type:	Basalt
Structure:	Just south of the Greenstone flow

References

MRDS	W060058
DEP	10082621
Reference	{Deposit:: BUTLER, B.S., AND BURBANK, W.S., 1929, THE COPPER DEPOSITS OF MICHIGAN: USGS PROF. PAPER NO. 144, 238 PP}{Deposit:: CORNWALL, H.R., AND WRIGHT, J.C., 1954, BEDROCK GEOLOGY OF THE EAGLE HARBOR, MICHIGAN: USGS MAP GQ-36, SCALE 1:24000}{Production:: BUTLER AND BURBANK, 1929}
Reporter	Nicholson, Suzanne, Sutphin, D.M., Mason Jr., G.T.