Mine detail: Minesota Mine

Previously called 'Minesota Fissure'

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Location

Lat / long:

46.73028, -89.17563

Resource(M)

Primary:	Copper
Secondary:	Silver
Ore:	Copper, Silver
Gangue:	Quartz, Calcite, Epidote, Pumpellyite-(Mg), Chlorite, Feldspar
Orebody form:	TABULAR FISSURE

Production

Operation type:	Unknown
Deposit type:	Secondary Enrichment
Production size:	Large
Development status:	Past Producer
First production started:	1848
Last production ended:	1885

Geology

Host rock:	Portage Lake Volcanics, Minnesota Conglomerate
Host type:	Basalt,Conglomerate
Structure:	Syncline, Minnesota fisssure, branch fissure
Alteration processes:	Bleaching and iron removal; silicification, pumpellitization

References

MRDS	W031503
DEP	10080378
Reference	{Deposit:: COPPER RANGE CO., UNPUBLISHED, 1968, BEDROCK GEOLOGY MAP OF THE ROCKLAND (NW 1/4) QUADRANGLE, ONTONAGON COUNTY, MICHIGAN. GEOLOGY MAPPED AND COMPILED BY THE COPPER RANGE EXPLORATION CO., INC., AND BY H. HUBBARD (U.S.G.S.)}{Deposit:: BUTLER, B.S., AND BURBANK, W.S., 1929, THE COPPER DEPOSITS OF MICHIGAN: U.S. GEOLOGICAL SURVEY PROF. PAPER 144,238P.}{Deposit:: WILBAND, J.T., 1978, THE COPPER RESOURCES OF NORTHERN MICHIGAN; PREPARED FOR THE U.S. BUREAU OF MINES, CONTRACT NO J0366067, 66P.}{Deposit:: JOHNSON, A.M., AND GROTH, E.H.,, 1998, INVENTORY OF UNDERGROUND MINES, ONTONAGON COUNTY, P. 173-176, MICHIGAN DEPARTMENT OF NATURAL RESOURCES.}{Production:: BUTLER AND BURBANK (1929)}
Reporter	Yeager, Keith (Cannon, W.), Sutphin, D.M., Mason Jr., G.T., Anderson, Arlene (M. Gere)