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:
Picacho Mine (Picacho Gold Mine; Goshen; Helen May; Tierra Rica; Mina Rica; St. George; California Gold King; Picacho Basin; Golden Rule; Venus; Jayne; Golden Casket; Dulciana; Mars), Picacho Peak, Picacho District, Chocolate Mts, Imperial Co., California, USA

Oldest recorded age at locality: 27.4
Youngest recorded age at locality: 23.9

mindat Locality ID: 77123
mindat URL: http://www.mindat.org/loc-77123.html

Tectonic Settings:

Total number of sublocalities beneath "Picacho Mine (Picacho Gold Mine; Goshen; Helen May; Tierra Rica; Mina Rica; St. George; California Gold King; Picacho Basin; Golden Rule; Venus; Jayne; Golden Casket; Dulciana; Mars), Picacho Peak, Picacho District, Chocolate Mts, Imperial Co., California, USA": 0
Total number of bottom-level sublocalities: 0

Latitude: 32°57'43"N
Longitude: 114°38'36"W
Decimal Degree (lat, lon): 32.961944444444,-114.64333333333

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	Clay	Copper	Corundum	Diaspore	Feldspar	Mica	None	Pyrite	Quartz
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: Ag Al Au C Ca Fe H K O S Si

Elements from minerals reported directly at this locality: Ag Al Au C Ca Fe H K O S Si

Structural Groups for minerals in this locality:
Calcite Clay Copper Corundum Diaspore Feldspar Mica None Pyrite Quartz
Spinel

10 IMA Minerals at location:

Calcite ()*	Goethite ()*	Gold ()*	Hematite ()*	Magnetite ()*
Microcline ()*	Muscovite ()*	Pyrite ()*	Quartz ()*	Silver ()*

Mineral name	Structural Groups	IMA Formula	Max Age (Ma)	Min Age (Ma)	# of localities containing mineral
Calcite ()*	Calcite	Ca(CO₃)	27.4	23.9	27770
Goethite ()*	Diaspore	FeO(OH)	27.4	23.9	7437
Gold ()*	Copper	Au	27.4	23.9	30554
Hematite ()*	Corundum	Fe₂O₃	27.4	23.9	14640
Magnetite ()*	Spinel	Fe²⁺Fe³⁺₂O₄	27.4	23.9	14899
Microcline ()*	Feldspar	K(AlSi₃O₈)	27.4	23.9	4924
Muscovite ()*	Mica Clay	KAl₂(Si₃Al)O₁₀(OH)₂	27.4	23.9	17380
Pyrite ()*	Pyrite	FeS₂	27.4	23.9	39462
Quartz ()*	Quartz	SiO₂	27.4	23.9	61156
Silver ()*	Copper	Ag	27.4	23.9	5186

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
	Giersdorf_00000390	27.4	24.2	25.8±1.6	K-Ar	Age suspected to be older than the Kinter formation found in the Chocolate Mountains.			UAKA-68-09		Yes				216264	Picacho, Picacho District, Chocolate Mts, Imperial Co., California, USA	Picacho Peak Quad.	Shafiqullah et al. (1980)		AGSD12_201
	Giersdorf_00000391	26.9	23.9	25.4±1.5	K-Ar				UAKA-67-01		Yes				216264	Picacho, Picacho District, Chocolate Mts, Imperial Co., California, USA	Picacho Peak Quad.	Shafiqullah et al. (1980)		AGSD12_201

Sample	Source Locality	Reference URL

All locality data graciously provided by mindat.org

All age data...