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:
Seiad Valley [town], Klamath River District, Klamath Mts, Siskiyou Co., California, USA

Oldest recorded age at locality: 167
Youngest recorded age at locality: 145

mindat Locality ID: 218907
mindat URL: http://www.mindat.org/loc-218907.html

Tectonic Settings:

Total number of sublocalities beneath "Seiad Valley [town], Klamath River District, Klamath Mts, Siskiyou Co., California, USA": 26
Total number of bottom-level sublocalities: 24

Number of Child Localities: 24
Child Localities:
Barkhouse And Whiskey Boy Occurrence
Barton Claims
China Wong Placer Mine
Grider Mine
Kettlewood And Tibbeta Mine
Keystone Belle Placer Mine
Lee Mine
Little Occurrence
Little Prospect
Livina & Billie Marie Placer Mine
Lowden Placer (Ariel Lowden Placer)
Lowden Placer (Jack Lowden Placer)
Mary Alma Placer
Prospect No. 1 (Dixie Mine)
Sanford And Edmundson Placer
Seiad Creek Prospect
Seiad Placer (Seiad Valley Placer)
Seiad Valley
Seiad Valley Mine (Seiad Creek Mine)
Teachers Flat Placer Mine
Unnamed Au Occurrence (12)
Unnamed Au Placer (2)
Welch Mine
Woods Placer Mine

Latitude: 41°50'35"N
Longitude: 123°11'37"W
Decimal Degree (lat, lon): 41.843055555556,-123.19361111111
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 Au Cr Fe H Mg O Pt Si 

Elements from minerals reported directly at this locality: 

Structural Groups for minerals in this locality: 
ChloriteClayCopperNoneSpinel

5 IMA Minerals at location:
Chromite  (*)Clinochlore  (*)Gold  (*)Magnesiochromite  (*)Platinum  (*)
Mineral nameStructural GroupsIMA FormulaMax Age (Ma)Min Age (Ma)# of Sublocalities containing mineralLOCALITY IDs, not mindat ids# of localities containing mineral
Chromite  (*)SpinelFe2+Cr2O41671452179386,1793873902
Clinochlore  (*)Chlorite ClayMg5Al(AlSi3O10)(OH)816714511793841756
Gold  (*)CopperAu16714512179369,179370,179372,179376,179377,179378,179379,179381,179383,179388,179390,17939230554
Magnesiochromite  (*)SpinelMgCr2O41671451179384311
Platinum  (*)CopperPt1671451179383485


Locality Notes from all Ages at Locality:
Age IDLocality Notes
Kristen002448Nevadan Orogeny includes the Kalamath Mountains


1 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
Kristen002448167145Middle to Early Jurassic     Yes  4064Josephine Creek Placers, Josephine Creek District, Josephine Co., Oregon, USANevadan Orogeny, Josephine Creek placersLanphere et al. (1968)10.1130/0016-7606(1968)79[1027:IAOTNO]2.0.CO;2GSAB79_1027 

SampleSource LocalityReference URL

All locality data graciously provided by mindat.org

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