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:
Big Oak Flat, Big Oak Flat District, East Belt, Tuolumne Co., California, USA

Oldest recorded age at locality: 162.5
Youngest recorded age at locality: 157.4

mindat Locality ID: 250075
mindat URL: http://www.mindat.org/loc-250075.html

Tectonic Settings:

Total number of sublocalities beneath "Big Oak Flat, Big Oak Flat District, East Belt, Tuolumne Co., California, USA": 35
Total number of bottom-level sublocalities: 35

Number of Child Localities: 35
Child Localities:
Abbie L. Mine
Banner Mine
Benner Occurrence
Bicknell Mine
Big Oak Flat No. 1 Mine (Conrad Mine)
Borne Mine
Brecknell Occurrence
Champion Mine
Cleo Mine (Jackson)
Contact Mine
Criss Cross & Relief Mine (Criss Cross And Relief Mine)
Eureka Mine (Eureka & Grizzly Mine; Eureka Claim; Grizzly Claim)
Eureka Mine (Eureka & Mississippi Mine; Mississippi Mine)
Fenton Group
Four Oaks Occurrence
Golden Eagle Occurrence
Golden Star Mine [1]
Grant Group
Group Mine (Mack Claim; Wooden Claim; Little Sisters Claim; Two Brothers Claim)
Little Wonder Mine
Longfellow Mine (Toughnut Mine; Longfellow Claim; Mark Claim)
Mack Occurrence (Big Casino)
Morhman Mine
Mormon Mine
National Group
Nonperiel Occurrence (Phil Oneil)
Paupers Dream Claim
Quinn Claims
Raggio Claim
Red Jacket Mine
Robinson Mine
Silken Mine
Tiger And Buffalo Claim
Tuolumne River Forsterite Occurrence
Two Brothers Mine (Two Brothers Claim; Little Sisters Claim)

Latitude: 37°49'25"N
Longitude: 120°15'31"W
Decimal Degree (lat, lon): 37.823611111111,-120.25861111111

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.

Chalcopyrite	Clay	Copper	None	Olivine	Pyrite	Pyroxene	Quartz	Rocksalt	Sphalerite
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 Cu Fe H Mg O Pb S Si Zn

Elements from minerals reported directly at this locality:

Structural Groups for minerals in this locality:
Chalcopyrite Clay Copper None Olivine Pyrite Pyroxene Quartz Rocksalt Sphalerite
Talc

10 IMA Minerals at location:

Chalcopyrite ()*	Copper ()*	Diopside ()*	Forsterite ()*	Galena ()*
Gold ()*	Pyrite ()*	Quartz ()*	Sphalerite ()*	Talc ()*

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
Chalcopyrite ()*	Chalcopyrite	CuFeS₂			1	182850	27198
Copper ()*	Copper	Cu			1	182850	3846
Diopside ()*	Pyroxene	CaMgSi₂O₆			1	182879	4135
Forsterite ()*	Olivine	Mg₂(SiO₄)			1	182879	1188
Galena ()*	Rocksalt	PbS			3	182850,182864,182865	24243
Gold ()*	Copper	Au	162.5	157.4	22	182846,182847,182849,182850,182851,182853,182855,182856,182857,182858,182862,182863,182864,182865,182866,182869,182870,182874,182875,182876,182877,182880	30554
Pyrite ()*	Pyrite	FeS₂			4	182856,182857,182864,182865	39462
Quartz ()*	Quartz	SiO₂			9	182846,182847,182849,182850,182857,182863,182865,182875,182876	61156
Sphalerite ()*	Sphalerite	ZnS			1	182850	21482
Talc ()*	Clay Talc	Mg₃Si₄O₁₀(OH)₂			1	182857	3337

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
	USGS-U-Th-Pb-00882_206_238	162.5	162.5	162.5	206_238			zircon				Zircon			97655	Contact Mine, Big Oak Flat, Big Oak Flat District, East Belt, Tuolumne Co., California, USA		USGS-U-Th-Pb		USGS-U-Th-Pb
	USGS-U-Th-Pb-00882_207_235	157.4	157.4	157.4	207_235			zircon				Zircon			97655	Contact Mine, Big Oak Flat, Big Oak Flat District, East Belt, Tuolumne Co., California, USA		USGS-U-Th-Pb		USGS-U-Th-Pb

Sample	Source Locality	Reference URL

All locality data graciously provided by mindat.org

All age data...