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Folsom District, Sacramento Co., California, USA
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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
var: Osmiridium

var: Ruthenosmiridium
var: Iridosmine

var: Ferroan Platinum
var: Rock Crystal


14 entries listed. 8 valid minerals.

Localities in this Region


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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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Copyright © Jolyon Ralph and Ida Chau 1993-2014. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of thousands of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
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