Commodities
PrimaryLead, Copper, Silver
SecondaryZinc, Gold
Commodity typeM
Deposit
Deposit typePolymetallic veins
Model85: Polymetallic veins
Deposit sizeY
WorkingsSurface/Underground
Orebody formELLIPTICAL PIPE
Ore controlBreccia Pipe, Junction Of Rhyolite Porphyry And Granite Porphyry Dikes, Whippoorwill And Savage Veins
Materials
Ore mineralsChalcopyrite, Galena, Malachite, Pyrite, Sphalerite, Tetrahedrite, Cerussite, Azurite
GangueQuartz, Barite, Hematite
Geology
Host rockGneiss,Volcanic Breccia (Agglomerate) · Silver Dyke Breccia-Fragments Of Granite & Rhyolite Porphyry And Gneiss;Gneiss
Associated rockDiorite,Rhyolite · Snow Creek Porphyry-Pluton & Dikes Of Rhyolite Porphyry & Alaskite;Carpenter Creek Porphyry-Dikes Of Granite Porphyry;Pinto Diorite-Large Phenocrysts Of Feldspar & Hornblende
StructureZone Of Igneous Intrusions Covering Over 800 Square Km, Domal Uplift Caused By Intrusion Of Snow Creek Porphyry, Northeast-Trending Fractures And Faults
Tectonic settingRocky Mountain Foreland
AlterationHost Rock Highly Altered To Kaolin, Sericite And Quartz.
Economic & production
Development statusPast Producer
First production1921
Discovery year1875
Identification
Deposit ID10071338
MRDS IDW014671
RegionNA
Data scoreA
Coordinates46.98352, -110.69528
References
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.ROBERTSON, A. F., 1951, MINES AND MINERAL DEPOSITS (EXCEPT FUELS), CASCADE COUNTY, MONT: U.S. BUREAU OF MINES INF. CIRC. 7589, 76 P.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.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.WEED, W.H., 1900, THE GEOLOGY OF THE LITTLE BELT MOOUNTAINS, MONTANA: U.S. GEOLOGICAL SURVEY TWENTIETH ANNUAL REPORT, PART 3.ROBERTSON, 1951, Mines and Mineral Deposits (except fuels), Cascade County, Montana: U.S. Bureau of Mines, Information Circular 7589