Mine detail: Mike Horse Mine

Previously called ''

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Location

Lat / long:

47.02314, -112.36262

Resource(M)

Primary:	Silver, Lead, Zinc
Secondary:	Gold, Copper
Ore:	Galena, Pyrite, Sphalerite, Chalcopyrite, Tetrahedrite, Enargite, Polybasite
Gangue:	Calcite
Orebody form:	LENSES & SHOOTS (fissure veins)
Discovery year:	1898

Production

Operation type:	Underground
Deposit type:	porphyry copper
Production size:	Yes
Development status:	Past Producer
First production started:	1915

Geology

Host rock:	Algonkian Belt Series, Metamorphosed Sediments
Host type:	Argillite
Associated rock:	Diorite Intrusive (Sill);Trachyte Porphyry Dikes
Associated type:	Diorite,Trachyte
Structure:	Lewis Overthrust, Boulder Batholith, Local Faulting Has Displaced Diorite Sill And Fractured Ore Body
Tectonic:	Cordilleran Miogeosyncline
Alteration processes:	Seriticization

References

MRDS	W014720
MAS	300490362
DEP	10071376
Reference	{Deposit:: PARDEE AND SCHRADER, 1933, METALLIFEROUS DEPOSITS OF THE GREATER HELENA MINING REGION, U.S. GEOLOGICAL SURVEY BULL. 842.}{Deposit:: ROBERTSON, F., 1956, GEOCHEMICAL PROSPECTING BY SOIL ANALYSES IN MT, MT BUREAU OF MINES & GEOLOGY BULL. 7.}{Deposit:: YOUNG, ET AL.,1962, Montana Bureau of Mines and Geology Bulletin 30, P.28}{Deposit:: CROWLEY,1961, Montana Bureau of Mines and Geology Bulletin 25, P.25}{Deposit:: GEACH, 1964, Montana Bureau of Mines and Geology Bulletin 46, P.20}{Deposit:: GEACH, 1966, Montana Bureau of Mines and Geology Bulletin 58, P.26}{Deposit:: REYNER AND TRAUERMAN, 1949, Montana Bureau of Mines and Geology Memoir 31, p.53.}{Deposit:: Miller, R.N., 1973, Unpublished Reprint, Geology of the Heddleston Cu-Mo Deposit L&}{Deposit:: Unpublished Montana Bureau of Mines and Geology File Data}{Production:: USBM MINERALS YEARBOOKS}
Reporter	Mlynarczyk, Meg S., Montana Bureau Of Mines And Geology Hgm (R), Causey, J. Douglas