Mine detail: Last Chance Mine

Previously called 'Ben Hur MineUs Mine'

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Location

Lat / long:

47.45543, -115.52629

Resource(M)

Primary:	Silver, Gold
Secondary:	Copper, Lead, Zinc
Ore:	Chalcopyrite, Galena, Tetrahedrite
Gangue:	Pyrite, Quartz, Siderite, Stibnite
Orebody form:	POD/LENS

Production

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

Geology

Host rock:	Revett Quartzite;Wallace Formation
Host type:	Quartzite,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 Folds To The North Showing Signs Of More Intense Structural Deformation Than Those To The South., Ne-Striking Fault Which Dips 65s, Folding.
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	D003855
DEP	10010264
Reference	{Deposit:: WALLACE, R. E. AND HOSTERMAN, J. W., 1956 , RECONNAISSANCE GEOLOGY OF WESTERN MINERAL COUNTY MONTANA: US GEOLOGICAL SURVEY BULL. 1027-M, PP. 588 , 601 , 604 .}{Deposit:: CALKINS, F. C. AND JONES, E. L. JR., 1914 , ECONOMIC GEOLOGY OF THE REGION AROUND MULLAN, IDAHO AND SALTESE, MONTANA: US GEOLOGICAL SURVEY BULL. 540 , P. 192 .}{Deposit:: LAWSON, D. C., 1972 : DIRECTORY OF MINING ENTERPRISES FOR 1971 : MONTANA BUREAU OF MINES AND GEOLOGY BULL. 86 , P. 14 .}{Production:: WALLACE, R. E. AND HOSTERMAN, J. W., 1956 : US GEOL SURVEY BULL. 1027-M, P. 604 .}
Reporter	Rojstaczer, Stuart A.