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Folsom Mining District, Sacramento County, California, USAi
Regional Level Types
Folsom Mining DistrictMining District
Sacramento CountyCounty
CaliforniaState
USACountry

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PhotosMapsSearch
Latitude & Longitude (WGS84):
38° North , 121° West (est.)
Estimate based on other nearby localities or region boundaries.
Margin of Error:
~64km
Mindat Locality ID:
215845
Long-form identifier:
mindat:1:2:215845:0
GUID (UUID V4):
1b3a6bee-5434-4861-896b-00aca525ee92


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.

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Commodity List

This is a list of exploitable or exploited mineral commodities recorded from this region.


Mineral List

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

10 valid minerals.

Detailed Mineral List:

Chromite
Formula: Fe2+Cr3+2O4
'Clay minerals'
Description: Refractory.
Erlichmanite
Formula: OsS2
Gold
Formula: Au
Localities: Reported from at least 17 localities in this region.
Irarsite
Formula: (Ir,Ru,Rh,Pt)AsS
Iridium
Formula: (Ir,Os,Ru)
Iridium var. Osmiridium
Formula: (Ir,Os,Ru)
Iridium var. Ruthenosmiridium
Formula: (Ir,Os,Ru)
'Iron-Platinum alloy'
Formula: (Pt,Fe)
Osmium
Formula: (Os,Ir,Ru)
Osmium var. Iridosmine
Formula: (Os,Ir)
Platinum
Formula: Pt
Description: Placer material.
Quartz
Formula: SiO2
Description: Fine quality.
Quartz var. Rock Crystal
Formula: SiO2
Description: Fine quality.
Rutheniridosmine
Formula: (Ir,Os,Ru)
Sperrylite
Formula: PtAs2

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
Gold1.AA.05Au
Iridium1.AF.10(Ir,Os,Ru)
var. Osmiridium1.AF.10(Ir,Os,Ru)
var. Ruthenosmiridium1.AF.10(Ir,Os,Ru)
Osmium1.AF.05(Os,Ir,Ru)
var. Iridosmine1.AF.05(Os,Ir)
Platinum1.AF.10Pt
Rutheniridosmine1.AF.05(Ir,Os,Ru)
Group 2 - Sulphides and Sulfosalts
Erlichmanite2.EB.05aOsS2
Irarsite2.EB.25(Ir,Ru,Rh,Pt)AsS
Sperrylite2.EB.05aPtAs2
Group 4 - Oxides and Hydroxides
Chromite4.BB.05Fe2+Cr3+2O4
Quartz4.DA.05SiO2
var. Rock Crystal4.DA.05SiO2
Unclassified Minerals, Rocks, etc.
'Clay minerals'-
'Iron-Platinum alloy'-(Pt,Fe)

List of minerals for each chemical element

OOxygen
O Quartz var. Rock CrystalSiO2
O ChromiteFe2+Cr23+O4
O QuartzSiO2
SiSilicon
Si Quartz var. Rock CrystalSiO2
Si QuartzSiO2
SSulfur
S Irarsite(Ir,Ru,Rh,Pt)AsS
S ErlichmaniteOsS2
CrChromium
Cr ChromiteFe2+Cr23+O4
FeIron
Fe Iron-Platinum alloy(Pt,Fe)
Fe ChromiteFe2+Cr23+O4
AsArsenic
As SperrylitePtAs2
As Irarsite(Ir,Ru,Rh,Pt)AsS
RuRuthenium
Ru Iridium var. Osmiridium(Ir,Os,Ru)
Ru Iridium var. Ruthenosmiridium(Ir,Os,Ru)
Ru Osmium(Os,Ir,Ru)
Ru Rutheniridosmine(Ir,Os,Ru)
Ru Irarsite(Ir,Ru,Rh,Pt)AsS
Ru Iridium(Ir,Os,Ru)
RhRhodium
Rh Irarsite(Ir,Ru,Rh,Pt)AsS
OsOsmium
Os Iridium var. Osmiridium(Ir,Os,Ru)
Os Iridium var. Ruthenosmiridium(Ir,Os,Ru)
Os Osmium(Os,Ir,Ru)
Os Osmium var. Iridosmine(Os,Ir)
Os Rutheniridosmine(Ir,Os,Ru)
Os ErlichmaniteOsS2
Os Iridium(Ir,Os,Ru)
IrIridium
Ir Iridium var. Osmiridium(Ir,Os,Ru)
Ir Iridium var. Ruthenosmiridium(Ir,Os,Ru)
Ir Osmium(Os,Ir,Ru)
Ir Osmium var. Iridosmine(Os,Ir)
Ir Rutheniridosmine(Ir,Os,Ru)
Ir Irarsite(Ir,Ru,Rh,Pt)AsS
Ir Iridium(Ir,Os,Ru)
PtPlatinum
Pt Iron-Platinum alloy(Pt,Fe)
Pt SperrylitePtAs2
Pt Irarsite(Ir,Ru,Rh,Pt)AsS
Pt PlatinumPt
AuGold
Au GoldAu

Localities in this Region

Other Regions, Features and Areas containing this locality


This page contains all mineral locality references listed on mindat.org. 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 mindat.org 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.

References

 
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