Mineral Evolution Database
Created and maintained by the Mineral Evolution Project in partnership with RRUFF and mindat.
Mineral locality data provided by mindat.org



The Mineral Evolution database is currently under development.

The goal of this page is to present localities at which the mineral is found, and estimates of the oldest possible geologic age of the minerals at these localities.


Locality Name:
Folsom, Folsom District, Sacramento Co., California, USA


mindat Locality ID: 215844
mindat URL: http://www.mindat.org/loc-215844.html

Tectonic Settings:

Total number of sublocalities beneath "Folsom, Folsom District, Sacramento Co., California, USA": 14
Total number of bottom-level sublocalities: 14

Number of Child Localities: 14
Child Localities:
American River
American River Placer Deposit
American River Placer Mine (American River Area)
Blue Ravine Occurrence
Buckeye Flat Mining Company Mine
Evanis Mine (Broder Ranch)
Folsom Prison Mine
Gold Hill Dredging Company Mine
Gray Wing Extension Mine
Mississippi Bar Placer Mine (American River Area)
Union Wisconsin Consolidated River Occurrence (Union Wiscon River)
Unnamed Au Placer Deposits (3)
Unnamed Cr Occurrence (1)
Unspecified Quartz Occurrence (1)

Latitude: 38°40'45"N
Longitude: 121°8'44"W
Decimal Degree (lat, lon): 38.679166666667,-121.14555555556

AThis mineral is Anthropogenic.
GThis mineral is directly dated.
BThis mineral is reported as having this age.
YThis mineral is using an age reported as an element mineralization period.
OThis mineral is using an age calculated from all data at the locality.
RThe age displayed for this mineral originates from a different, non-child locality.
PThe age displayed for this mineral is the range of ages for this mineral at all of this locality's children.
This mineral's age has not yet been recorded.

This Mineral list contains entries from this locality, including sub-localities. Minerals in bold are reported by mindat.org as occurring directly at this locality, and do not occur at any children (sublocalities) of this locality.

Elements at this locality, including sub-localities: As Au Cr Fe Ir O Os Pt Ru S Si 

Elements from minerals reported directly at this locality: 

Structural Groups for minerals in this locality: 
CopperNonePyriteQuartzSpinel

10 IMA Minerals at location:
Chromite  (*)Erlichmanite  (*)Gold  (*)Irarsite  (*)Iridium  (*)
Osmium  (*)Platinum  (*)Quartz  (*)Rutheniridosmine  (*)Sperrylite  (*)
Mineral nameStructural GroupsIMA FormulaMax Age (Ma)Min Age (Ma)# of Sublocalities containing mineralLOCALITY IDs, not mindat ids# of localities containing mineral
Chromite  (*)SpinelFe2+Cr2O411700293902
Erlichmanite  (*)PyriteOsS21170017110
Gold  (*)CopperAu7170018,170019,170021,170022,170024,170026,17002830554
Irarsite  (*)PyriteIrAsS1170017154
Iridium  (*)CopperIr1170017162
Osmium  (*)NoneOs1170017169
Platinum  (*)CopperPt2170017,170026485
Quartz  (*)QuartzSiO2117003061156
Rutheniridosmine  (*)None(Ir,Os,Ru)117001747
Sperrylite  (*)PyritePtAs21170017337



No ages have been assigned to this locality yet.

SampleSource LocalityReference URL


All locality data graciously provided by mindat.org

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