Mine detail: Hartley Mine

Previously called ''

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Location

Lat / long:

46.93797, -110.7289

Resource(M)

Primary:	Lead, Zinc, Silver
Secondary:	Gold, Copper
Ore:	Cerargyrite, Proustite, Pyrargyrite, Silver, Sphalerite
Gangue:	Barite
Orebody form:	SHOOTS
Discovery year:	1883

Production

Operation type:	Unknown
Production size:	Yes
Development status:	Past Producer
First production started:	1901

Geology

Host rock:	Belt, Neihart Quartzite;Gneiss And Schist
Host type:	Gneiss
Associated rock:	Snow Creek Porphyry-Pluton And Dikes Of Rhyolite Porphyry;Pinto Diorite-Large Phenocrysts Of Feldspar & Hornblende
Associated type:	Diorite,Rhyolite
Structure:	Zone Of Igneous Intrusions Covering Over 800 Square Km., Moulton Fault, Northeast-Trending Fractures, Domal Uplift Caused By Intrusion Of Snow Creek Porphyry
Tectonic:	Rocky Mountain Foreland
Alteration processes:	Sericitization, Kaolinization. Considerable Oxidation Of Ore To A Depth Of About 200 Ft.

References

MRDS	W014701
DEP	10105721
Reference	{Deposit:: KLEINKOPF, M. D., AND OTHERS, 1972, AEROMAGNETIC, BOUGUER GRAVITY, AND GENERALIZED GEOLOGIC MAPS OF THE CENTRAL PART OF THE LITTLE BELT MOUNTAINS: U.S. GEOLOGICAL SURVEY MAP GP-837.}{Deposit:: ROBERTSON, A. F., 1951, MINES AND MINERAL DEPOSITS (EXCEPT FUELS), CASCADE COUNTY, MONT.: U.S. BUREAU OF MINES INF. CIRC. 7589, 76 P.}{Deposit:: SCHAFER P. A., 1935, GEOLOGY AND ORE DEPOSITS OF THE NEIHART MINING DISTRICT, CASCADE COUNTY, MONTANA: MONT. BUREAU OF MINES GEOL. MEM 13, 62 P.}
Reporter	Krohn, Douglas H.