Yellowstone Mine (Cameron; Johnny Gulch Talc; Montana Talc), Gravelly Range, Madison Co., Montana, USA
|Latitude & Longitude (WGS84):||45° 4' 36'' North , 111° 43' 50'' West|
|Latitude & Longitude (decimal):||45.07667,-111.73056|
|Köppen climate type:||Dfb : Warm-summer humid continental climate|
Sec. 4, T 9 S, R 1 W.
Commodities (Major) - Talc-Soapstone
Deposit Type: Replacement
Development Status: Producer
Host Rock Unit: Dolomitic Marble, Madison Limestone
Structure: Folds In Metamorphic Rocks Faults Of Minor Displacement
Host Rock: Dolomite, Marble
Tectonic Structure: Precambrian Basement
Commodity ListThis is a list of exploitable or exploited mineral commodities recorded at this locality.
4 valid minerals.
Rock Types Recorded
Select Rock List TypeAlphabetical List Tree Diagram
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
2500 - 4000 Ma
|Wyoming Province, metasedimentary rocks, marble, southwestern Montana|
Age: Archean (2500 - 4000 Ma)
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. 
2500 - 4000 Ma