Mine detail: Rock Island Mine

Previously called ''

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Location

Lat / long:

47.43348, -115.30628

Resource(M)

Primary:	Copper, Lead, Zinc
Ore:	Chalcopyrite, Chrysocolla, Galena, Malachite, Sphalerite
Gangue:	Limonite, Pyrite, Pyrrhotite, Quartz
Orebody form:	POD/LENS

Production

Operation type:	Unknown
Production size:	Small
Development status:	Past Producer

Geology

Host type:	Argillite
Structure:	A Major Structural Grain Trends Nw And Consists Of Subparallel Faults And Folds. Major Fault Is The Osburn. This Fault Seems To Demarcate A Change In Folding Form With Fold To The North Showing Signs Of More Intense Structural Deformation Than Those To The South
Tectonic:	Belt Basin
Alteration processes:	Hydrothermal Bleaching Is Common Within A Belt Approx 1 Mi Wide Along The North Side Of The Osburn Fault Zone. It Has Been Used As A Guide To Ore Deposits.

References

MRDS	DC11300
DEP	10102024
Reference	{Deposit:: WALLACE, R. E. AND HOSTERMAN, J. W., 1956 , RECONNAISSANCE GEOLOGY OF WESTERN MINERAL COUNTY, MONTANA: US GEOLOGICAL SURVEY BULL. 1027-M, P. 605 .}{Deposit:: YOUNG, F. M., CROWLEY, F. A., AND SAHINEN, U. M., 1962 , MARKETING PROBLEMS OF SMALL BUSINESS ENTERPRISES ENGAGED IN LEAD AND ZINC MINING: MONTANA BUREAU OF MINES AND GEOLOGY BULL. 30 , P. 31 .}{Deposit:: CONSV. DIV. COMP. DATE, 01-09-1963}{Production:: WALLACE, R. E. AND HOSTERMAN, J. W., 1956 : US GEOLOGICAL SURVEY BULL. 1027-M, P. 605 .}
Reporter	Unknown, Rojstaczer, Stuart A.