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:
Four Corners, Amador Co., California, USA

Oldest recorded age at locality: 311
Youngest recorded age at locality: 170

mindat Locality ID: 263881
mindat URL: http://www.mindat.org/loc-263881.html

Tectonic Settings:

Total number of sublocalities beneath "Four Corners, Amador Co., California, USA": 11
Total number of bottom-level sublocalities: 11

Number of Child Localities: 11
Child Localities:
Copper Hill Mine (Cosumnes Mine; Hobo Mine; Jackass Shaft)
Detert Property (Detert Group)
John Orr Property
Lilly Dredge
Malinda Setter Properties
Mutual Life Insurance Company Property
Pension Occurrence
R. H. Hingston Ranch Placer Mine (Hingston Ranch)
Sally Placer Mine
Tiger Mine
Unnamed Cr Prospect [5]

Latitude: 38°30'20"N
Longitude: 120°56'3"W
Decimal Degree (lat, lon): 38.505555555556,-120.93416666667
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: Au C Cr Cu Fe H Mg O S Zn 

Elements from minerals reported directly at this locality: 

Structural Groups for minerals in this locality: 
ChalcopyriteCopperEpsomiteMalachiteNoneNot in a structural groupPyriteSphaleriteSpinel

10 IMA Minerals at location:
Azurite  (*)Bornite  (*)Chalcocite  (*)Chalcopyrite  (*)Chromite  (*)
Epsomite  (*)Gold  (*)Malachite  (*)Pyrite  (*)Sphalerite  (*)
Mineral nameStructural GroupsIMA FormulaMax Age (Ma)Min Age (Ma)# of Sublocalities containing mineralLOCALITY IDs, not mindat ids# of localities containing mineral
Azurite  (*)Not in a structural groupCu3(CO3)2(OH)217017011508845509
Bornite  (*)NoneCu5FeS417017011508845516
Chalcocite  (*)NoneCu2S17017011508845707
Chalcopyrite  (*)ChalcopyriteCuFeS2170170115088427198
Chromite  (*)SpinelFe2+Cr2O431131111508853902
Epsomite  (*)EpsomiteMg(SO4)·7H2O1701701150884484
Gold  (*)CopperAu5150886,150888,150890,150891,15089230554
Malachite  (*)MalachiteCu2(CO3)(OH)2170170115088412537
Pyrite  (*)PyriteFeS2170170115088439462
Sphalerite  (*)SphaleriteZnS170170115088421482


2 Ages assigned to this locality:

Excel IDMax Age (Ma)Min Age (Ma)Age as listed in referenceDating MethodAge InterpretPrioritized?Sample SourceSample NumRun NumAge from other LocalityDated MineralMinerals explicitely stated as having this ageAge applies to these ElementsMinDat Locality IDDated Locality (Max Age)Location as listed in referenceReferenceReference DOIReference IDAge Notes
vms-01027170170Jurassic       S73552Copper Hill Mine (Cosumnes Mine; Hobo Mine; Jackass Shaft), Four Corners, Amador Co., California, USACopper HillMoiser et al. (2009) USGSOFR2009_1034 
podchrome-00081311311Pennsylvanian (311±3 m.y. 206Pb/238U)       Cr73570Detert Property (Detert Group), Four Corners, Amador Co., California, USADetert PropertyMoiser et al. (2012) USGSSIR2012_5157 

SampleSource LocalityReference URL

All locality data graciously provided by mindat.org

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