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:
Forest, Alleghany District (Forest District), Sierra Co., California, USA

Oldest recorded age at locality: 388
Youngest recorded age at locality: 388

mindat Locality ID: 215867
mindat URL: http://www.mindat.org/loc-215867.html

Tectonic Settings:

Total number of sublocalities beneath "Forest, Alleghany District (Forest District), Sierra Co., California, USA": 20
Total number of bottom-level sublocalities: 19

Number of Child Localities: 19
Child Localities:
Bald Mountain Mine (Bald Mountain Extension Mine)
Brown Bear Mine [1]
Corotoman Placer
Diadem Claim
Doriss Mine (Dorriss; Chrome F N; Chrome P N)
Evans Prospect (Oak)
Federal Mine
Gold Bug Prospect
Happy Camp Placer
Live Yankee Mine (Live Yankee Claim)
Lucky Dog Gravel Mine
Oak Mine (Evans Mine)
Occidental Occurrence (Shotgun)
Occidental Placer
Old Bald Mountain Placer Mine (Old Bald Mt)
Ruby Mine (Mineral Mountain)
South Fork Group (South Fork Mine; Verdi; Honey Bee; Bullion; Amethyst; Amethyst Extension; Amethyst Ext; Phoebe; Lady Bug; Mable; Marguerite)
Uncle Sam Mine (Verrue; Keller; Yates; Simpson; North Fork Mine; Wisconsin Extension; Wisconsin Ext)
Unnamed Magnetite Occurrence [1]

Latitude: 39°29'36"N
Longitude: 120°51'19"W
Decimal Degree (lat, lon): 39.493333333333,-120.85527777778

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.

Arsenopyrite	Clay	Copper	Feldspar	Garnet	Marcasite	None	Pyrite	Quartz	Rocksalt
Rutile	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: Al As Au Ca Cr Fe H Mg Na O Pb S Si Ti

Elements from minerals reported directly at this locality:

Structural Groups for minerals in this locality:
Arsenopyrite Clay Copper Feldspar Garnet Marcasite None Pyrite Quartz Rocksalt
Rutile Spinel Talc

12 IMA Minerals at location:

Albite ()*	Arsenopyrite ()*	Chromite ()*	Galena ()*	Gold ()*
Magnetite ()*	Marcasite ()*	Pyrite ()*	Quartz ()*	Rutile ()*
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
Albite ()*	Feldspar	Na(AlSi₃O₈)			1	177288	8803
Arsenopyrite ()*	Arsenopyrite	FeAsS			2	177286,177288	9052
Chromite ()*	Spinel	Fe²⁺Cr₂O₄	388	388	2	177274,177275	3902
Galena ()*	Rocksalt	PbS			1	177288	24243
Gold ()*	Copper	Au			13	177270,177271,177273,177276,177277,177278,177279,177281,177284,177285,177286,177287,177288	30554
Magnetite ()*	Spinel	Fe²⁺Fe³⁺₂O₄			1	177289	14899
Marcasite ()*	Marcasite	FeS₂			1	177288	5674
Pyrite ()*	Pyrite	FeS₂			1	177288	39462
Quartz ()*	Quartz	SiO₂	388	388	9	177271,177273,177275,177276,177277,177281,177286,177287,177288	61156
Rutile ()*	Rutile	TiO₂			1	177288	5614
Talc ()*	Clay Talc	Mg₃Si₄O₁₀(OH)₂			1	177288	3337
Uvarovite ()*	Garnet	Ca₃Cr₂(SiO₄)₃	388	388	1	177274	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-00192	388	388	pre-Early Devonian-Jurassic (388±17 Ma U-Pb zircon from felsic igneous rocks; 174 Ma K-Ar white mica from blueschists)										Cr	93225	Doriss Mine (Dorriss; Chrome F N; Chrome P N), Forest, Alleghany District (Forest District), Sierra Co., California, USA	Dorriss	Moiser et al. (2012)		USGSSIR2012_5157
	podchrome-00193	388	388	pre-Early Devonian-Jurassic (388±17 Ma U-Pb zircon from felsic igneous rocks; 174 Ma K-Ar white mica from blueschists)										Cr	93253	Evans Prospect (Oak), Forest, Alleghany District (Forest District), Sierra Co., California, USA	Evans Prospect	Moiser et al. (2012)		USGSSIR2012_5157

Sample	Source Locality	Reference URL

All locality data graciously provided by mindat.org

All age data...