Description
Thomas Angers, Et. Al.
Commodities
PrimaryLead, Zinc, Silver
SecondaryGold, Copper
Commodity typeM
Deposit
Deposit sizeY
WorkingsUnderground
Orebody formSHOOTS
Ore controlMain Vein Occupies Well-Define Fissure. Moulton Fault To South May Have Been Ore Control.
Materials
Ore mineralsCerargyrite, Proustite, Pyrargyrite, Silver, Sphalerite
GangueBarite
Geology
Host rockGneiss · Belt, Neihart Quartzite;Gneiss And Schist
Associated rockDiorite,Rhyolite · Snow Creek Porphyry-Pluton And Dikes Of Rhyolite Porphyry;Pinto Diorite-Large Phenocrysts Of Feldspar & Hornblende
StructureZone Of Igneous Intrusions Covering Over 800 Square Km., Moulton Fault, Northeast-Trending Fractures, Domal Uplift Caused By Intrusion Of Snow Creek Porphyry
Tectonic settingRocky Mountain Foreland
AlterationSericitization, Kaolinization. Considerable Oxidation Of Ore To A Depth Of About 200 Ft.
Economic & production
Development statusPast Producer
First production1901
Discovery year1883
Identification
Deposit ID10105721
MRDS IDW014701
RegionNA
Data scoreB
Coordinates46.93797, -110.7289
References
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.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, MONTANA: MONT. BUREAU OF MINES GEOL. MEM 13, 62 P.