Mine detail: Hartley Mine

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Location: Cascade County, Montana, United States, North America
Lat / long: 46.93797, -110.7289
dep_id: 10105721
mrds_id: W014701
Commodity type: metallic
Major mineral: Lead, Zinc, Silver
Minor mineral: Gold, Copper
Operation type: Unknown
Production size: Production occurred
Development status: Past Producer
ore: Cerargyrite, Proustite, Pyrargyrite, Silver, Sphalerite
gangue: Barite
orebody_fm: SHOOTS
work_type: Underground
alteration: Sericitization, Kaolinization. Considerable Oxidation Of Ore To A Depth Of About 200 Ft.
conc_proc: Supergene Enrichment
ore_ctrl: Main Vein Occupies Well-Define Fissure. Moulton Fault To South May Have Been Ore Control.
Reporter: Krohn, Douglas H.
hrock_unit: Belt, Neihart Quartzite;Gneiss And Schist
hrock_type: Gneiss
arock_unit: Snow Creek Porphyry-Pluton And Dikes Of Rhyolite Porphyry;Pinto Diorite-Large Phenocrysts Of Feldspar & Hornblende
arock_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
Year first produced: 1901
disc_yr: 1883
discr: Thomas Angers, Et. Al.
References:
  • 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.
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