Mine detail: Last Chance Mine

Previously called 'Wardner MineSweeney Mine'

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Location

Lat / long:

47.51694, -116.14855

Resource(M)

Primary:	Lead, Silver
Secondary:	Zinc, Copper
Tertiary:	Gold
Ore:	Galena, Sphalerite, Tetrahedrite, Chalcopyrite
Gangue:	Quartz, Siderite, Pyrite
Orebody form:	TABULAR
Discovery year:	1885

Production

Operation type:	Underground
Deposit type:	HYDROTHERMAL VEIN AND REPLACEMENT
Production size:	Medium
Development status:	Past Producer
Production years:	1888-1918
First production started:	1888
Last production ended:	1918

Geology

Host rock:	St. Regis Formation, Revett Formation
Host type:	Quartzite
Structure:	The Cate Fault (strikes NW to N, dips 55SW) is the main shear in the deposit with several branch shears, the Dull Fault being the most important. The Cate Fault and its branch shears are connected by Link faults which trend NE., Deposit is within the NE limb of a WNW-striking anticline. Host sediments strike N60-80W and dip SW. The axial plane of the anticline strikes N16W dips 42W and the axis plunges 34 degrees to N60W.
Tectonic:	Belt Basin
Alteration processes:	The Last Chance orebodies were largely oxidized, with cerussite the principal ore mineral.

References

MRDS	W019519
DEP	10107338
Reference	{Deposit:: UMPLEBY, J. B., AND JONES, E. L., JR., 1923 , GEOLOGY AND ORE DEPOSITS OF SHOSHONE COUNTY, IDAHO: USGS BULL. 732 , 156 P.}{Deposit:: RANSOME, F. L., AND CALKINS, F.C., 1908 , THE GEOLOGY AND ORE DEPOSITS OF THE COEUR *ALENE DISTRICT, IDAHO: USGS PROF. PAPER 62 , 203 P.}{Deposit:: RANSOME, F. L., 1905 , ORE DEPOSITS OF THE COEUR *ALENE DISTRICT, IDAHO: USGS BULL. 260 , P. 274 - 303}{Deposit:: Hobbs, S. W., And Others, 1965 , Geology Of The Coeur *lene District, Shoshone County, Idaho: USGS Prof. Paper 478 , 139 P.}{Production:: Mitchell, V.E., and Bennett, E.H., 1983, Production statistics for the Coeur *lene mining district, Shoshone County, Idaho, 1884-1980: Idaho Geological Survey Technical Report 83-3, 33 p.}{Production:: Long, Keith R., 1998, Grade and tonnage models for Coeur *lene-type polymetallic veins: U.S. Geological Survey Open-File Report 98-583, 28 p.}
Reporter	Kauffman, John D., Long, Keith R., Miller, Pat J.