Mine detail: True Fissure Mine

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Location: Mineral County, Montana, United States, North America
Lat / long: 47.41765, -115.33294
dep_id: 10019047
mrds_id: DC08403
Commodity type: metallic
Major mineral: Lead, Silver
Minor mineral: Copper
Operation type: Unknown
Production size: No production occurred
Development status: Occurrence
ore: Chalcopyrite, Galena
gangue: Hematite, Pyrite, Quartz, Siderite
work_type: Underground
alteration: Hydrothermal Bleaching Is Common Within A Belt Approx 1 Mi Wide Along The North Side Of The Osburn Fault Zone. It Has Been Used As A Guide To Ore Deposits.
ore_ctrl: Osburn Fault Zone
Reporter: Unknown, Rojstaczer, Stuart A.
hrock_unit: Burke Formation;Revett Formation
hrock_type: Quartzite
Structure: A Major Structural Grain Trends Nw And Consists Of Subparallel Faults And Folds. Major Fault Is The Osburn. This Fault Seems To Demarcate A Change In Folding Form With Folds To The North Showing Signs Of More Intense Structural Deformation Than Those To The South., Owing To Its Proximity To The Osborn Fault Beds Are Greatly Deformed And Are In Tight, Overturned, Nearly Isoclinal Folds
tectonic: Belt Basin
References:
  • Analytical Data:: SRC.REF: WALLACE, R. E. AND HOSTERMAN, J. W., 1956 : US GEOLOGICAL SURVEY BULL. 1027-M
  • Deposit:: WALLACE, R. E. AND HOSTERMAN, J. W., 1956 , RECONNAISSANCE GEOLOGY OF WESTERN MINERAL COUNTY MONTANA: US GEOLOGICAL SURVEY BULL. 1027-M, P. 607 .
  • Deposit:: CONSV. DIV. COMP. DATE, 02-15-1963
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