Mine detail: Picket Pin

Previously called ''

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Location

Lat / long:

45.44936, -110.05108

Resource(M)

Primary:	Platinum, Palladium
Secondary:	Copper, Nickel
Tertiary:	Cobalt, Iridium, Gold, Arsenic, Antimony
Ore:	Chalcopyrite, Pentlandite, Pyrite, Pyrrhotite, Sperrylite
Gangue:	Apatite, Calcite, Chlorite, Graphite, Magnetite, Plagioclase, Quartz, Talc
Orebody form:	LENSES, PODS, PIPES, DISSEMINATED
Discovery year:	1936

Production

Operation type:	Unknown
Production size:	None
Development status:	Occurrence

Geology

Host type:	Anorthosite
Structure:	The Stillwater Complex Is Exposed Along The Northern Margin Of The Beartooth Uplift, One Of Several Laramide Basement-Cored Ranges That Make Up The Rocky Mountain Foreland Of South-Central Montana (Foose And Others, 1961: Kulik And Schmidt, 1988), Cross Faults Offset Sulfide Bearing Zone
Tectonic:	Tectonic Setting At Time Of Emplacement Of The Stillwater Complex Is Unknown. The Complex Was Emplaced Shortly After A Major Regional, Subduction-Related Magmatic Event That Culminated In Emplacement Of The 2.73-2.79 Ga Granitoid Suite In The Batholith Exposed In The Beartooth Uplift (Wooden And Others, 1991). However, There Is No Evidence That The Magmatism That Formed The Stillwater Complex Is Related To Convergent Margin Tectonics And Magmatism
Alteration processes:	Plagioclase Is Altered To Clinozoisite-Epidote, Pyroxene To Chlorite-Calcite-(Talc)- Magnetite-Quartz, Pyrrhotite To Pyrite

References

MRDS	MP00090
DEP	10048501
Reference	{Deposit:: BOUDREAU, A.E., AND MCCALLUM, I.S., 1986, INVESTIGATIONS OF THE STILLWATER COMPLEX: III. THE PICKET PIN PT/PD DEPOSIT: ECONOMIC GEOLOGY, V. 81, P. 1953-1975.}{Deposit:: ZIENTEK, M.L., 1993, MINERAL RESOURCE APPRAISAL FOR LOCATABLE MINERALS: THE STILLWATER COMPLEX, IN HAMMARSTROM, J.M., ZIENTEK, M.L., AND ELLIOTT, J.E., EDS., MINERAL RESOURCE ASSESSMENT OF THE ABSAROKA-BEARTOOTH STUDY AREA, CUSTER AND GALLATIN NATIONAL FORESTS, MONTANA: U.S. GEOLOGICAL SURVEY OPEN-FILE REPORT 93-207, P. F1-F83.}{Deposit:: HOWLAND, A.L., PEOPLES, J.W., AND SAMPSON, EDWARD, 1936, THE STILLWATER IGNEOUS COMPLEX AND ASSOCIATED OCCURRENCES OF NICKEL AND PLATINUM GROUP METALS: MONTANA BUREAU OF MINES AND GEOLOGY MISCELLANEOUS CONTRIBUTION 7, 15 P.}{Deposit:: PREMO, W.R., HELZ, R.T., ZIENTEK, M.L., AND LANGSTON, R.B., 1990, U-PB AND SM-ND AGES FOR THE STILLWATER COMPLEX AND ITS ASSOCIATED SILLS AND DIKES, BEARTOOTH MOUNTAINS, MONTANA: IDENTIFICATION OF A PARENT MAGMA?: GEOLOGY, V. 18, P. 1065-1068.}
Reporter	Peterson, Jocelyn A.