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:
North Keystone Mine (Keystone Mine), Copperopolis Mines (Copperopolis Group), Copperopolis, Foothill Copper Belt, Calaveras Co., California, USA

Oldest recorded age at locality: 170
Youngest recorded age at locality: 100

mindat Locality ID: 13833
mindat URL: http://www.mindat.org/loc-13833.html

Tectonic Settings: Continental Arc

Total number of sublocalities beneath "North Keystone Mine (Keystone Mine), Copperopolis Mines (Copperopolis Group), Copperopolis, Foothill Copper Belt, Calaveras Co., California, USA": 0
Total number of bottom-level sublocalities: 0

Latitude: 37°59'13"N
Longitude: 120°38'51"W
Decimal Degree (lat, lon): 37.986944444444,-120.6475
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: Al C Ca Cu Fe H O S Si Ti 

Elements from minerals reported directly at this locality: Al C Ca Cu Fe H O S Si Ti 

Structural Groups for minerals in this locality: 
AndalusiteCalciteChalcopyriteClinozoisiteCopperCorundumEpidoteMalachiteNoneNot in a structural group
PyriteQuartzRutileTitanite

14 IMA Minerals at location:
Andalusite  (*)Bornite  (*)Calcite  (*)Chalcopyrite  (*)Copper  (*)
Cuprite  (*)Epidote  (*)Hematite  (*)Ilmenite  (*)Malachite  (*)
Pyrite  (*)Quartz  (*)Rutile  (*)Titanite  (*)
Mineral nameStructural GroupsIMA FormulaMax Age (Ma)Min Age (Ma)# of Sublocalities containing mineralLOCALITY IDs, not mindat ids# of localities containing mineral
Andalusite  (*)AndalusiteAl2SiO517017001310
Bornite  (*)NoneCu5FeS417017005516
Calcite  (*)CalciteCa(CO3)170170027770
Chalcopyrite  (*)ChalcopyriteCuFeS2170170027198
Copper  (*)CopperCu17017003846
Cuprite  (*)Not in a structural groupCu2O17017002970
Epidote  (*)Epidote ClinozoisiteCa2(Al2Fe3+)[Si2O7][SiO4]O(OH)17017008173
Hematite  (*)CorundumFe2O3170170014640
Ilmenite  (*)CorundumFe2+Ti4+O317017005433
Malachite  (*)MalachiteCu2(CO3)(OH)2170170012537
Pyrite  (*)PyriteFeS2170170039462
Quartz  (*)QuartzSiO2170170061156
Rutile  (*)RutileTiO217017005614
Titanite  (*)TitaniteCaTi(SiO4)O17017004899


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
Mo-00156100100      YesMolybdeniteMo16293Calaveras Co., California, USACalaveras CountyBrock (1972)10.1130/0016-7606(1972)83[3391:GOGHSC]2.0.CO;2GSAB83_3391 
vms-01037170170Jurassic       S13833North Keystone Mine (Keystone Mine), Copperopolis Mines (Copperopolis Group), Copperopolis, Foothill Copper Belt, Calaveras Co., California, USANorth KeystoneMoiser et al. (2009) USGSOFR2009_1034 

SampleSource LocalityReference URL

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