Mine detail: Monitor Mine

Previously called 'Interstate MineCallahan MineInterstate-Callahan MineGrey Rock LeaseSilver State ProspectMontana-Idaho'

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Location

Lat / long:

47.34377, -115.60241

Resource(M)

Primary:	Silver, Zinc, Lead
Secondary:	Copper
Tertiary:	Gold
Ore:	Sphalerite, Galena, Chalcopyrite, Tetrahedrite, Malachite
Gangue:	Calcite, Quartz, Siderite, Pyrite, Chlorite, Pyrrhotite, Grunerite, Magnetite, Clinozoisite, Epidote, Garnet, Hematite, Ankerite
Orebody form:	PINCH AND SWELL
Discovery year:	1885

Production

Operation type:	Underground
Deposit type:	HYDROTHERMAL VEIN AND REPLACEMENT
Production size:	Medium
Development status:	Past Producer
Production years:	1892, 1906-1910, 1912-1924, 1936-1977
First production started:	1892
Last production ended:	1977

Geology

Host rock:	Lower Prichard Formation
Host type:	Argillite
Associated rock:	Gem Stock
Associated type:	Monzonite
Structure:	Osburn Fault (WNW) to south of deposit., Burke-Trout Creek Anticline (NS) - deposit occurs in the south end of the east limb., Puritan Fault (N10W 70NE) bounds the deposit to the east., Carlisle Fault (N20W 75SW) bounds the deposit to the west., Monzonite dike strikes EW, dips 70N, with parallel plane of weakness.
Tectonic:	Belt Basin
Alteration processes:	Sericite-pyrite envelopes extend well outward from veins into host Prichard Formation argilite. A calcite-chlorite envelope extends less far from the vein, and orthoclase-epidote-garnet occur very close to the vein. The monzonite dikes are progressively altered, as mineralization is approached, from a zone where horblende is altered to chlorite and epidote, feldspar to clinozoisite, sphene to leucoxene and epidote, magnetite to epidote, and pyrite to hematite, to a zone where sericite begins to replace all minerals associated with calcite, to a zone where the rock almost entirely consists of sericite and calcite.

References

MRDS	W026680
DEP	10106000
Reference	{Deposit:: ROALES, P. A., 1973 , ORE AND MONZONITE DIKE RELATIONS, MONITOR MINE, COEUR *LENE DISTRICT, IDAHO: MOSCOW, IDAHO, UNIV. OF IDAHO, MS THESIS, 142 P.}{Deposit:: FRYKLUND, V. C., JR., 1964 , ORE DEPOSITS OF THE COEUR *LENE DISTRICT, SHOSHONE COUNTY, IDAHO: USGS PROF. PAPER 445 , 103 P.}{Deposit:: JONES, E. L., 1919 , A RECONNAISSANCE OF THE PINE CREEK DISTRICT, IDAHO: USGS BULL. 710 , 36 P.}{Deposit:: GRIGGS, A. B., 1952 , GEOLOGY AND NOTES ON ORE DEPOSITS IN CANYON-NINE MILE CREEKS AREA, SHOSHONE COUNTY, IDAHO: USGS OPEN - FILE REPT., 108 P.}{Reserve-Resource:: DAY MINES 1973 ANNUAL REPORT, P. 3 .}
Reporter	Long, Keith R., Kauffman, John D., Unknown, Chesson, Sharon A., Miller, Pat J.