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:
Todd Valley, Forest Hill District, Placer Co., California, USA

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

mindat Locality ID: 266159
mindat URL: http://www.mindat.org/loc-266159.html

Tectonic Settings:

Total number of sublocalities beneath "Todd Valley, Forest Hill District, Placer Co., California, USA": 35
Total number of bottom-level sublocalities: 35

Number of Child Localities: 35
Child Localities:
Big Bend Placer Mine
Bisbee Mine
Bowman Mine
Buckhorn Occurrence
Burner Prospect
California Chief Development Company Property (Calif. Chief Development Co.)
Derby And Wild Cat Occurrence (Derby & Wild Cat)
Diana Occurrence
Dodds Ranch Prospect (Dodds Ranch Deposit)
Dorr Placer
Duffy Property
Effie Placer Mine
Eureka Consolidated Mine (Eureka Cons.; Eureka No. 1 Claim; Eureka No. 2 Claim; Eureka Extension No. 1 Claim; Buttes Extension Claim; Hathaway Claim; Kirkland Claim)
Farmer Property
Farnier Occurrence
Fiddler's Green Deposit (Farmer Property)
Garbe And De Maria Mine (Dry Hill; Blue Jay)
Garden Springs Consolidated
Gas Canyon Claim
Green Deposit (Americus Deposit; Farmer Property)
Hosmer Occurrence
Maria No. 2 Mine
Mountain Tunnel Placer
New Black Jack Mine
Owl Creek Mine
Peckham Hill Gold Mines Inc. (Peckham Hill Mine)
Pond Pit (Pond & Company Mine)
Rainy Day Placer Mine
Shenanigan Mine
Unnamed Au Mine [37]
Unnamed Au Mine [39]
Unnamed Au Occurrence [47]
Unnamed Au Occurrence [65]
Unnamed Au Pit [32]
Walsh Occurrence

Latitude: 38°59'10"N
Longitude: 120°53'47"W
Decimal Degree (lat, lon): 38.986111111111,-120.89638888889

A	This mineral is Anthropogenic.
G	This mineral is directly dated.
B	This mineral is reported as having this age.
Y	This mineral is using an age reported as an element mineralization period.
O	This mineral is using an age calculated from all data at the locality.
R	The age displayed for this mineral originates from a different, non-child locality.
P	The 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.

Clay	Copper	Garnet	None	Quartz	Spinel	Talc

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 Ca Cr Fe H Mg O Si

Elements from minerals reported directly at this locality:

Structural Groups for minerals in this locality:
Clay Copper Garnet None Quartz Spinel Talc

6 IMA Minerals at location:

Chromite ()*	Gold ()*	Magnetite ()*	Quartz ()*	Talc ()*
Uvarovite ()*

Mineral name	Structural Groups	IMA Formula	Max Age (Ma)	Min Age (Ma)	# of Sublocalities containing mineral	LOCALITY IDs, not mindat ids	# of localities containing mineral
Chromite ()*	Spinel	Fe²⁺Cr₂O₄	311	311	6	166999,167003,167004,167011,167014,167015	3902
Gold ()*	Copper	Au			14	166996,166997,167000,167006,167007,167008,167012,167019,167020,167021,167022,167023,167025,167026	30554
Magnetite ()*	Spinel	Fe²⁺Fe³⁺₂O₄	311	311	1	167011	14899
Quartz ()*	Quartz	SiO₂			7	166997,167000,167008,167012,167020,167025,167026	61156
Talc ()*	Clay Talc	Mg₃Si₄O₁₀(OH)₂	311	311	1	167011	3337
Uvarovite ()*	Garnet	Ca₃Cr₂(SiO₄)₃	311	311	1	167014	212

2 Ages assigned to this locality:

	Excel ID	Max Age (Ma)	Min Age (Ma)	Age as listed in reference	Dating Method	Age Interpret	Prioritized?	Sample Source	Sample Num	Run Num	Age from other Locality	Dated Mineral	Minerals explicitely stated as having this age	Age applies to these Elements	MinDat Locality ID	Dated Locality (Max Age)	Location as listed in reference	Reference	Reference DOI	Reference ID	Age Notes
	podchrome-00158	311	311	Pennsylvanian (304-311 Ma U-Pb zircon from plagiogranite)										Cr	85331	Fiddler's Green Deposit (Farmer Property), Todd Valley, Forest Hill District, Placer Co., California, USA	Fiddler's Green	Moiser et al. (2012)		USGSSIR2012_5157
	podchrome-00157	311	311	Pennsylvanian (304-311 Ma U-Pb zircon from plagiogranite)										Cr	85348	Gas Canyon Claim, Todd Valley, Forest Hill District, Placer Co., California, USA	Gas Canyon Claim	Moiser et al. (2012)		USGSSIR2012_5157

Sample	Source Locality	Reference URL

All locality data graciously provided by mindat.org

All age data...