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:
West Belt, El Dorado Co., California, USA

Oldest recorded age at locality: 388
Youngest recorded age at locality: 311

mindat Locality ID: 77956
mindat URL: http://www.mindat.org/loc-77956.html

Tectonic Settings:

Total number of sublocalities beneath "West Belt, El Dorado Co., California, USA": 209
Total number of bottom-level sublocalities: 191

Number of Child Localities: 3
Child Localities:
Coloma District
Deer Valley District
Shingle Springs District

Latitude: 38°44'40"N
Longitude: 120°55'15"W
Decimal Degree (lat, lon): 38.744444444444,-120.92083333333

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.

Amphibole	Arsenopyrite	Calcite	Chalcopyrite	Chlorite	Clay	Clinozoisite	Copper	Corundum	Epidote
Feldspar	Iron	Malachite	Mica	Molybdenite	Nickeline	None	Olivine	Pentlandite	Pyrite
Pyroxene	Quartz	Rocksalt	Rutile	Serpentine	Sphalerite	Spinel	Stibnite	Talc	Titanite
Tochilinite

Actinolite ()*	Albite ()*	Ankerite ()*	Arsenopyrite ()*	Bornite ()*
Calcite ()*	Chalcocite ()*	Chalcopyrite ()*	Chromite ()*	Cinnabar ()*
Clinochlore ()*	Copper ()*	Corundum ()*	Cronstedtite ()*	Diopside ()*
Dolomite ()*	Enstatite ()*	Epidote ()*	Forsterite ()*	Galena ()*
Gold ()*	Hedenbergite ()*	Hematite ()*	Hessite ()*	Iron ()*
Magnesiochromite ()*	Magnetite ()*	Malachite ()*	Molybdenite ()*	Muscovite ()*
Oldhamite ()*	Pentlandite ()*	Pyrite ()*	Pyrrhotite ()*	Quartz ()*
Riebeckite ()*	Roscoelite ()*	Rutile ()*	Schreibersite ()*	Sphalerite ()*
Spinel ()*	Stibnite ()*	Taenite ()*	Talc ()*	Titanite ()*
Tochilinite ()*	Troilite ()*

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 As Au C Ca Cr Cu Fe H Hg K Mg Mo Na Ni O P Pb S Sb Si Te Ti V Zn

Elements from minerals reported directly at this locality:

Structural Groups for minerals in this locality:
Amphibole Arsenopyrite Calcite Chalcopyrite Chlorite Clay Clinozoisite Copper Corundum Epidote
Feldspar Iron Malachite Mica Molybdenite Nickeline None Olivine Pentlandite Pyrite
Pyroxene Quartz Rocksalt Rutile Serpentine Sphalerite Spinel Stibnite Talc Titanite
Tochilinite

47 IMA Minerals at location:

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
Actinolite ()*	Amphibole	Ca₂(Mg_4.5-2.5Fe²⁺_0.5-2.5)Si₈O₂₂(OH)₂			1	155441	3419
Albite ()*	Feldspar	Na(AlSi₃O₈)			2	155441,155484	8803
Ankerite ()*	None	Ca(Fe²⁺,Mg)(CO₃)₂			2	155372,155441	3092
Arsenopyrite ()*	Arsenopyrite	FeAsS			2	155418,155446	9052
Bornite ()*	None	Cu₅FeS₄			4	155418,155442,155488,155489	5516
Calcite ()*	Calcite	Ca(CO₃)			4	155309,155409,155441,155484	27770
Chalcocite ()*	None	Cu₂S			1	155442	5707
Chalcopyrite ()*	Chalcopyrite	CuFeS₂			10	155328,155368,155372,155373,155398,155418,155441,155442,155446,155448	27198
Chromite ()*	Spinel	Fe²⁺Cr₂O₄	388	311	21	155292,155295,155297,155303,155304,155309,155313,155316,155322,155332,155360,155378,155382,155386,155390,155399,155404,155430,155445,155460,155472	3902
Cinnabar ()*	None	HgS			1	155376	2600
Clinochlore ()*	Chlorite Clay	Mg₅Al(AlSi₃O₁₀)(OH)₈	388	388	2	155302,155382	1756
Copper ()*	Copper	Cu			1	155328	3846
Corundum ()*	Corundum	Al₂O₃			1	155309	1797
Cronstedtite ()*	Clay Serpentine	(Fe²⁺,Fe³⁺)₃(Si,Fe³⁺)₂O₅(OH)₄			1	155309	54
Diopside ()*	Pyroxene	CaMgSi₂O₆			1	155309	4135
Dolomite ()*	None	CaMg(CO₃)₂			1	155309	9895
Enstatite ()*	Pyroxene	Mg₂Si₂O₆			1	155309	944
Epidote ()*	Epidote Clinozoisite	Ca₂(Al₂Fe³⁺)[Si₂O₇][SiO₄]O(OH)			2	155441,155450	8173
Forsterite ()*	Olivine	Mg₂(SiO₄)			1	155309	1188
Galena ()*	Rocksalt	PbS			6	155368,155372,155373,155393,155418,155448	24243
Gold ()*	Copper	Au			87	155286,155293,155294,155296,155299,155301,155305,155306,155308,155310,155311,155312,155315,155319,155324,155328,155329,155330,155334,155335,155336,155342,155343,155347,155348,155349,155351,155352,155355,155356,155357,155358,155362,155363,155364,155365,155367,155368,155370,155371,155372,155373,155380,155391,155392,155393,155395,155401,155402,155405,155408,155409,155412,155413,155415,155418,155422,155425,155427,155429,155433,155437,155438,155441,155443,155446,155447,155448,155449,155450,155452,155453,155454,155455,155456,155457,155458,155459,155463,155467,155470,155473,155476,155477,155478,155480,155484	30554
Hedenbergite ()*	Pyroxene	CaFe²⁺Si₂O₆			1	155309	741
Hematite ()*	Corundum	Fe₂O₃			3	155418,155441,155450	14640
Hessite ()*	None	Ag₂Te			1	155476	804
Iron ()*	Iron	Fe			1	155485	1089
Magnesiochromite ()*	Spinel	MgCr₂O₄	388	388	1	155302	311
Magnetite ()*	Spinel	Fe²⁺Fe³⁺₂O₄			4	155309,155359,155418,155450	14899
Malachite ()*	Malachite	Cu₂(CO₃)(OH)₂			2	155328,155418	12537
Molybdenite ()*	Molybdenite	MoS₂			1	155418	5800
Muscovite ()*	Mica Clay	KAl₂(Si₃Al)O₁₀(OH)₂			1	155372	17380
Oldhamite ()*	Rocksalt	CaS			1	155309	58
Pentlandite ()*	Pentlandite	(Ni,Fe)₉S₈			1	155309	1512
Pyrite ()*	Pyrite	FeS₂			13	155368,155373,155376,155392,155393,155409,155418,155441,155446,155448,155450,155457,155484	39462
Pyrrhotite ()*	Nickeline	Fe₇S₈			2	155309,155441	9056
Quartz ()*	Quartz	SiO₂			56	155286,155293,155296,155299,155305,155306,155312,155329,155330,155335,155336,155343,155349,155351,155352,155357,155364,155367,155368,155370,155371,155373,155380,155388,155391,155392,155393,155395,155402,155408,155409,155412,155413,155415,155418,155425,155427,155429,155433,155434,155438,155441,155443,155446,155447,155448,155450,155457,155458,155459,155463,155467,155477,155480,155484,155486	61156
Riebeckite ()*	Amphibole	Na₂(Fe²⁺₃Fe³⁺₂)Si₈O₂₂(OH)₂			1	155450	375
Roscoelite ()*	Mica	KV³⁺₂(Si₃Al)O₁₀(OH)₂			3	155306,155308,155323	253
Rutile ()*	Rutile	TiO₂			1	155441	5614
Schreibersite ()*	None	(Fe,Ni)₃P			1	155309	374
Sphalerite ()*	Sphalerite	ZnS			4	155309,155418,155428,155448	21482
Spinel ()*	Spinel	MgAl₂O₄			1	155309	1934
Stibnite ()*	Stibnite	Sb₂S₃			1	155418	3418
Taenite ()*	None	(Ni,Fe)			1	155485	703
Talc ()*	Clay Talc	Mg₃Si₄O₁₀(OH)₂	388	388	9	155295,155297,155302,155328,155379,155383,155393,155484,155486	3337
Titanite ()*	Titanite	CaTi(SiO₄)O			1	155441	4899
Tochilinite ()*	Tochilinite	6(Fe_0.9S)·5[(Mg,Fe)(OH)₂]			1	155309	56
Troilite ()*	None	FeS			1	155309	1044

7 Ages assigned to this locality:

Excel ID	Max Age (Ma)	Min Age (Ma)	Age as listed in reference	Age applies to these Elements	MinDat Locality ID	Dated Locality (Max Age)	Location as listed in reference	Reference	Reference ID
podchrome-00119	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	77910	McCurdy Mine [2], Coloma, Coloma District, West Belt, El Dorado Co., California, USA	McCurdy	Moiser et al. (2012)	USGSSIR2012_5157
podchrome-00120	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	77999	O'Brien Mine (S-Bend Mine), Coloma, Coloma District, West Belt, El Dorado Co., California, USA	O'Brien	Moiser et al. (2012)	USGSSIR2012_5157
podchrome-00123	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	78187	Shelley Mine (Wolf Mine; Shelly Mine; Shelley Wolf Mine), Coloma, Coloma District, West Belt, El Dorado Co., California, USA	Shelly	Moiser et al. (2012)	USGSSIR2012_5157
podchrome-00125	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	78190	Sheppard Mine, Coloma, Coloma District, West Belt, El Dorado Co., California, USA	Sheppard	Moiser et al. (2012)	USGSSIR2012_5157
podchrome-00121	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	78196	Simon Mine, Coloma, Coloma District, West Belt, El Dorado Co., California, USA	Simon North	Moiser et al. (2012)	USGSSIR2012_5157
podchrome-00122	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	78196	Simon Mine, Coloma, Coloma District, West Belt, El Dorado Co., California, USA	Simon South	Moiser et al. (2012)	USGSSIR2012_5157
podchrome-00118	311	311	Pennsylvanian (311±3 m.y. 206Pb/238U)	Cr	78403	Williamson Mine (Hector Williamson), Cold Springs, Shingle Springs District, West Belt, El Dorado Co., California, USA	Williamson	Moiser et al. (2012)	USGSSIR2012_5157

Sample	Source Locality	Reference URL

All locality data graciously provided by mindat.org

All age data...