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Folsom District, Sacramento Co., California, USA

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Location is approximate, estimate based on other nearby localities.
Latitude & Longitude (WGS84): 38° South , 121° West (est.)
Margin of Error:~10km

The Folsom District extends NW along the S side of the American River, S to Nimbus and W to Mather Air Force Base.

A Au-PGE (Pt-Ir) placer mining area. Pt from this district averages 43.49% Pt. Commonly ferroan platinum alloy and 20.81% Ir.

Mineral List

Mineral list contains entries from the region specified including sub-localities

Rock Types Recorded

Entries shown in red are rocks recorded for this region.

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

Rock list contains entries from the region specified including sub-localities

10 valid minerals.

Localities in this Region

The above list contains all mineral locality references listed on This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.


Logan, Clarence August (1918), Platinum and allied metals in California: California Mining Bureau. Bulletin 85, 120 pp.: 27-28, 109.

Clark, Wm. B. (1970a) Gold districts of California: California Division Mines & Geology Bulletin 193.

Clark, Wm. B. (1970b) Platinum: California Division Mines and Geology Mineral Information Service: 23: 115-122:

Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 43.

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