Mine detail: Silver Dyke Mine

Previously called ''

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Location

Lat / long:

46.98352, -110.69528

Resource(M)

Primary:	Lead, Copper, Silver
Secondary:	Zinc, Gold
Ore:	Chalcopyrite, Galena, Malachite, Pyrite, Sphalerite, Tetrahedrite, Cerussite, Azurite
Gangue:	Quartz, Barite, Hematite
Orebody form:	ELLIPTICAL PIPE
Discovery year:	1875

Production

Operation type:	Unknown
Deposit type:	Polymetallic veins
Production size:	Yes
Development status:	Past Producer
First production started:	1921

Geology

Host rock:	Silver Dyke Breccia-Fragments Of Granite & Rhyolite Porphyry And Gneiss;Gneiss
Host type:	Gneiss,Volcanic Breccia (Agglomerate)
Associated rock:	Snow Creek Porphyry-Pluton & Dikes Of Rhyolite Porphyry & Alaskite;Carpenter Creek Porphyry-Dikes Of Granite Porphyry;Pinto Diorite-Large Phenocrysts Of Feldspar & Hornblende
Associated type:	Diorite,Rhyolite
Structure:	Zone Of Igneous Intrusions Covering Over 800 Square Km, Domal Uplift Caused By Intrusion Of Snow Creek Porphyry, Northeast-Trending Fractures And Faults
Tectonic:	Rocky Mountain Foreland
Alteration processes:	Host Rock Highly Altered To Kaolin, Sericite And Quartz.

References

MRDS	W014671
DEP	10071338
Reference	{Deposit:: MARVIN, R. F., AND OTHERS, 1973, RADIOMETRIC AGES OF INTRUSIVE ROCKS IN THE LITTLE BELT MOUNTAINS, MONT: GEOL. SOC. AM. BULL. VOL. 84, NO. 6 P. 1977-1986.}{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, MONT: MONT. BUREAU OF MINES GEOL., MEM. 13, 62 P.}{General:: YOUNG, G.J., 1927, NOVEL MINING AND MILLING METHODS AT THE SILVER DYKE PROPERTY AT NEIHART, MONTANA: ENGINEERING AND MINING JOURNAL V. 123, NO. 6, P. 236-241, FEB. 5, 1927.}{Geology:: WEED, W.H., 1900, THE GEOLOGY OF THE LITTLE BELT MOOUNTAINS, MONTANA: U.S. GEOLOGICAL SURVEY TWENTIETH ANNUAL REPORT, PART 3.}{Production:: ROBERTSON, 1951, USBM INF. CIRC. 7589}
Reporter	Krohn, Douglas H.