Mine detail: Nassau Mine

Previously called 'Old Flintsteel MineSuperior-Nassau Superior Mine'

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Location

Lat / long:

46.74111, -89.14479

Resource(M)

Primary:	Copper
Ore:	Copper
Gangue:	Quartz, Calcite, Epidote, Pumpellyite-(Mg), Chlorite, Feldspar

Production

Operation type:	Underground
Deposit type:	Secondary Enrichment
Production size:	Unknown
Development status:	Past Producer

Geology

Host rock:	Portage Lake Volcanics
Host type:	Basalt
Alteration processes:	Removal of hematite, copper replacement, quartz-pumpellyite bleaching

References

MRDS	W031504
DEP	10080379
Reference	{Deposit:: COPPER RANGE CO., UNPUBLISHED, 1968, BEDROCK GEOLOGY MAP OF THE ROCKLAND (NW1/4)QUADRANGLE, ONTONAGON COUNTY, MICHIGAN. GEOLOGY MAPPED AND COMPILED BY 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. 181-182, MICHIGAN DEPARTMENT OF NATURAL RESOURCES.}
Reporter	Yeager, Keith (Cannon, W.), Sutphin, D.M., Mason Jr., G.T., Anderson, Arlene (M. Gere)