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:
Alta, Dutch Flat District (Towle District), Placer Co., California, USA

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

mindat Locality ID: 211241
mindat URL: http://www.mindat.org/loc-211241.html

Tectonic Settings:

Total number of sublocalities beneath "Alta, Dutch Flat District (Towle District), Placer Co., California, USA": 13
Total number of bottom-level sublocalities: 13

Number of Child Localities: 13
Child Localities:
Bartley Mine
Bradley & Gardner Occurrence
Bull Run Placer
Delmus Group
Dyer Placer
Elmore Hill Placer Mine
Golden Shaft Placer
Hodge Ranch Occurrence
J. L. Gould Group
Mary Red Placer (Mary Red Mine)
Unison Placer
Unnamed Magnesite Occurrence [3]
Uvarovite Claim

Latitude: 39°13'1"N
Longitude: 120°48'58"W
Decimal Degree (lat, lon): 39.216944444444,-120.81611111111

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.

Calcite	Copper	None	Spinel

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 C Cr Fe Mg O

Elements from minerals reported directly at this locality:

Structural Groups for minerals in this locality:
Calcite Copper None Spinel

3 IMA Minerals at location:

Chromite ()*	Gold ()*	Magnesite ()*

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	388	388	2	166847,166852	3902
Gold ()*	Copper	Au			2	166845,166846	30554
Magnesite ()*	Calcite	Mg(CO₃)			1	166851	1487

1 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-00131	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	85443	Hodge Ranch Occurrence, Alta, Dutch Flat District (Towle District), Placer Co., California, USA	Hodge Ranch NE	Moiser et al. (2012)		USGSSIR2012_5157

Sample	Source Locality	Reference URL

All locality data graciously provided by mindat.org

All age data...