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Keystone Mine, Silver Star District, Madison Co., Montana, USA

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Latitude & Longitude (WGS84): 45° 41' 57'' North , 112° 19' 6'' West
Latitude & Longitude (decimal): 45.69917,-112.31833
Köppen climate type:BSk : Cold semi-arid (steppe) climate


REF:Deposit:: MIN RES OF US, 1910-13
Deposit:: MBMG MEM 19, P. 34
MBM&G IC 24, 1958, P12.
Commodities (Major) - Silver, Gold; (Minor) - Copper
Deposit Type: Contact Metasomatic
Development Status: Past Producer
Host Rock Unit: Pre Belt
Host Rock: Gneiss


Commodity List

This is a list of exploitable or exploited mineral commodities recorded at this locality.


Mineral List


6 valid minerals.

Rock Types Recorded

Note: this is a very new system on mindat.org and data is currently VERY limited. Please bear with us while we work towards adding this information!

Select Rock List Type

Alphabetical List Tree Diagram

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org

Miocene
5.333 - 23.03 Ma



ID: 3188223
Cenozoic sedimentary rocks

Age: Miocene (5.333 - 23.03 Ma)

Lithology: Sedimentary rocks

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

Cretaceous
66 - 145 Ma



ID: 2984479
Granitic rock

Age: Cretaceous (66 - 145 Ma)

Lithology: Major:{granitic}

Reference: Horton, J.D., C.A. San Juan, and D.B. Stoeser. The State Geologic Map Compilation (SGMC) geodatabase of the conterminous United States. doi: 10.3133/ds1052. U.S. Geological Survey Data Series 1052. [133]

Cretaceous
66 - 145 Ma



ID: 2114127
Boulder and Tobacco Root batholiths, granodiorite

Age: Cretaceous (66 - 145 Ma)

Lithology: Major:: {granodiorite}

Reference: Zientek, M.L., P.D. Derkey, R.J. Miller, J.D. Causet et al. Spatial Databases for the Geology of the Northern Rocky Mountains - Idaho, Montana, and Washington. U.S. Geological Survey Open-File Report 2005-1235 Version 1.0. [25]

Data and map coding provided by Macrostrat.org, used under Creative Commons Attribution 4.0 License



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