Description
Jonathan Mcassey
Commodities
PrimarySilver
SecondaryLead, Zinc
Commodity typeM
Deposit
Deposit sizeY
WorkingsUnderground
Orebody formTABULAR
Ore controlOre Localized In Shoots Caused By Intersection Of Main Vein With Gneiss Banding - Ore Also Improves As Vein Nears Fault
Materials
Ore mineralsPolybasite, Proustite, Pyrite
GangueBarite, Rhodochrosite
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 - With N 70 Deg W Strike And Steep 85 Deg N Dip. - Suggested To Be Pre-Mineral
Tectonic settingRocky Mountain Foreland
AlterationSericitization & Carbonatization
Economic & production
Development statusProducer
First production1895
Discovery year1882
Identification
Deposit ID10071389
MRDS IDW014736
RegionNA
Data scoreB
Coordinates46.93935, -110.73445
References
SCHAFER, 1935, GEOLOGY & ORE DEPOSIT S - NEIHART MINING DISTRICT, CASCADE COUNTY, MONTANA, MT BUREAU MINES & GEOLOGY MEMOIR 13.LAWSON, D. C., 1976, DIRECTORY OF MINING ENTEPRISES FOR 1975, MONTANA BUREAU MINES & GEOLOGY BULL. 100.ROBERTSON, A. F., 1951, MINES & MINERAL DEPOSITS - CASCADE COUNTY, U. S. BUREAU MINES INF. CIRC. 7589.KLEINKOPF, M. D., WITKIND, I. J., AND KEEFER, W. R., 1972, AEROMAGNETIC, BOUGUER GRAVITY, AND GENERALIZED GEOLOGIC MAPS OF THE CENTRAL PART OF THE LITTLE BELT MOUNTAINS, MONTANA: U.S. GEOLOGICAL SURVEY MAP GP-837ROBERTSON, 1951, U.S.B.M. INF. CIRC. 7589