Mine detail: Caledonia Mine

Previously called ''

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Location

Lat / long:

47.52457, -116.16683

Resource(M)

Primary:	Lead, Silver
Secondary:	Copper
Tertiary:	Gold
Ore:	Tetrahedrite, Chalcopyrite, Galena, Sphalerite, Covellite, Malachite, Silver, Massicot, Cerussite
Gangue:	Quartz, Pyrite, Siderite, Limonite
Orebody form:	PINCH AND SWELL
Discovery year:	1895

Production

Operation type:	Underground
Deposit type:	HYDROTHERMAL VEIN AND REPLACEMENT
Production size:	Small
Development status:	Past Producer
Production years:	1909-1932, 1934-1942
First production started:	1909
Last production ended:	1942

Geology

Host rock:	St. Regis Formation
Host type:	Quartzite
Structure:	Vein in hangingwall of Osburn Fault, and bounded by the Osburn and New Era Faults within the overturned north limb of a WNW-trending anticline., Combination Fault (N67E 35-45SE) offsets the Caledonia vein 183 meters to the north onto the Omaha claim. Vein was followed 300 feet on the eastern side of the fault. West of the fault are two high-grade shoots of direct shipping ore, 46 and 91 meters long, separated by 38 meters of lower grade milling ore.
Tectonic:	Belt Basin
Alteration processes:	Oxidation is significant and complete down to the 200 foot level. Vein outcrop consists of quartz and limonite. Massicot, cerussite, silver chlorides, and native silver were found in the oxide zone.

References

MRDS	W019397
DEP	10073353
Reference	{Deposit:: UMPLEBY, J. B., AND JONES, E. L., JR., 1923 , GEOLOGY AND ORE DEPOSITS OF SHOSHONE CO., IDAHO: U.S. GEOLOGICAL SURVEY BULL. 732 , 156 P.}{Deposit:: Hershey, O.H., 1911, The geology and ore deposits of the Wardner district, Idaho: Kellogg, Idaho, Bunker Hill & Sullivan Mining & Concentrating Co., 777 p. [University of Idaho, Special Collections, Bunker Hill Collection, Box 99]}{Deposit:: Fryklund, V.C., Jr., 1964, Ore deposits of the Coeur *lene district, Shoshone County, Idaho: US Geological Survey Professional Paper 445, 103 p.}{Deposit:: Ransome, F.L., and Calkins, F.C., 1908, The geology and ore deposits of the Coeur *lene district, Idaho: US Geological Survey Professional Paper 62, 203 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 Society 83-3, 33 p.}{Production:: Long, K.R., 1998, Grade and tonnage models for Coeur *lene-type polymetallic veins: US Geological Survey Open-File Report 98-583, 28 p.}
Reporter	Miller, Pat J., Western Field Operations Center, Long, Keith R.