Mineral Evolution Database

Created and maintained by the Mineral Evolution Project in partnership with RRUFF and mindat.

Mineral locality data provided by mindat.org

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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:
Grass Valley District, Nevada Co., California, USA

Oldest recorded age at locality: 204
Youngest recorded age at locality: 157

mindat Locality ID: 208735
mindat URL: http://www.mindat.org/loc-208735.html

Tectonic Settings:

Total number of sublocalities beneath "Grass Valley District, Nevada Co., California, USA": 338
Total number of bottom-level sublocalities: 309

Number of Child Localities: 5
Child Localities:
Cedar Ridge
Grass Valley
La Barr Meadows
Newtown
Peardale

Latitude: 39°12'33"N
Longitude: 121°2'40"W
Decimal Degree (lat, lon): 39.209166666667,-121.04444444444

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.

Acanthite	Amorphous	Andalusite	Arsenic	Arsenopyrite	Calcite	Chalcopyrite	Clay	Clinozoisite	Copper
Epidote	Feldspar	Gypsum	Marcasite	Mica	Nickeline	None	Not in a structural group	Pyrite	Quartz
Rocksalt	Scheelite	Sphalerite	Spinel	Talc	Tetrahedrite	Wollastonite

Acanthite ()*	Altaite ()*	Andalusite ()*	Ankerite ()*	Anorthite ()*
Arsenic ()*	Arsenopyrite ()*	Calcite ()*	Chalcopyrite ()*	Chromite ()*
Dolomite ()*	Epidote ()*	Ferrimolybdite ()*	Galena ()*	Gold ()*
Gypsum ()*	Hessite ()*	Magnesite ()*	Magnetite ()*	Marcasite ()*
Muscovite ()*	Naumannite ()*	Opal ()*	Petzite ()*	Pyrargyrite ()*
Pyrite ()*	Pyrrhotite ()*	Quartz ()*	Scheelite ()*	Sphalerite ()*
Stephanite ()*	Talc ()*	Tetrahedrite-(Zn) ()*	Wollastonite ()*

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 K Mg Mo O Pb S Sb Se Si Te W Zn

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

Structural Groups for minerals in this locality:
Acanthite Amorphous Andalusite Arsenic Arsenopyrite Calcite Chalcopyrite Clay Clinozoisite Copper
Epidote Feldspar Gypsum Marcasite Mica Nickeline None Not in a structural group Pyrite Quartz
Rocksalt Scheelite Sphalerite Spinel Talc Tetrahedrite Wollastonite

34 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
Acanthite ()*	Acanthite	Ag₂S			1	165608	2793
Altaite ()*	Rocksalt	PbTe			1	165416	489
Andalusite ()*	Andalusite	Al₂SiO₅	204	157	0		1310
Ankerite ()*	None	Ca(Fe²⁺,Mg)(CO₃)₂			11	165419,165424,165425,165434,165438,165441,165461,165494,165608,165627,165659	3092
Anorthite ()*	Feldspar	Ca(Al₂Si₂O₈)	204	157	0		1036
Arsenic ()*	Arsenic	As			3	165371,165373,165416	379
Arsenopyrite ()*	Arsenopyrite	FeAsS			4	165438,165441,165442,165621	9052
Calcite ()*	Calcite	Ca(CO₃)			15	165373,165412,165419,165424,165425,165434,165435,165438,165441,165461,165471,165494,165498,165608,165627	27770
Chalcopyrite ()*	Chalcopyrite	CuFeS₂			16	165389,165419,165424,165425,165434,165437,165438,165441,165461,165491,165492,165494,165517,165546,165608,165627	27198
Chromite ()*	Spinel	Fe²⁺Cr₂O₄	204	157	14	165382,165384,165402,165405,165455,165469,165473,165482,165577,165604,165617,165681,165687,165690	3902
Dolomite ()*	None	CaMg(CO₃)₂			2	165434,165494	9895
Epidote ()*	Epidote Clinozoisite	Ca₂(Al₂Fe³⁺)[Si₂O₇][SiO₄]O(OH)			2	165389,165579	8173
Ferrimolybdite ()*	None	Fe³⁺₂(Mo⁶⁺O₄)₃·7H₂O			1	165422	345
Galena ()*	Rocksalt	PbS			24	165389,165400,165412,165417,165419,165424,165425,165434,165437,165438,165440,165441,165444,165450,165461,165479,165491,165492,165494,165498,165608,165621,165627,165629	24243
Gold ()*	Copper	Au	157	157	256	165360,165362,165363,165364,165365,165366,165368,165369,165371,165372,165373,165374,165376,165378,165379,165380,165383,165385,165386,165388,165389,165390,165391,165393,165399,165400,165401,165403,165404,165406,165407,165408,165409,165411,165412,165413,165414,165415,165416,165417,165418,165419,165420,165421,165422,165424,165425,165426,165430,165431,165432,165433,165434,165435,165436,165437,165438,165439,165440,165441,165443,165444,165445,165446,165448,165449,165450,165451,165452,165453,165454,165456,165457,165459,165460,165461,165462,165463,165464,165466,165468,165470,165471,165474,165475,165477,165478,165479,165480,165481,165483,165485,165486,165487,165488,165489,165491,165492,165493,165494,165495,165498,165499,165501,165502,165503,165504,165505,165506,165507,165509,165510,165511,165512,165513,165514,165515,165516,165518,165519,165520,165521,165522,165523,165524,165525,165526,165527,165528,165529,165530,165531,165532,165533,165534,165536,165537,165538,165539,165540,165542,165543,165544,165545,165546,165547,165548,165549,165550,165551,165553,165554,165555,165556,165557,165559,165560,165561,165562,165563,165564,165565,165566,165567,165568,165569,165570,165571,165574,165575,165578,165581,165582,165583,165585,165586,165588,165589,165590,165591,165592,165595,165596,165597,165598,165599,165600,165601,165602,165603,165608,165609,165610,165611,165612,165613,165614,165615,165616,165618,165619,165620,165621,165622,165623,165624,165625,165626,165627,165628,165629,165630,165632,165633,165634,165635,165636,165637,165638,165639,165640,165641,165642,165643,165644,165645,165646,165647,165649,165652,165654,165655,165656,165657,165658,165659,165660,165661,165663,165664,165665,165667,165668,165669,165670,165671,165675,165676,165677,165678,165680,165683,165684,165693,165695,165696	30554
Gypsum ()*	Gypsum	Ca(SO₄)·2H₂O	204	157	0		6890
Hessite ()*	None	Ag₂Te			2	165371,165494	804
Magnesite ()*	Calcite	Mg(CO₃)			2	165494,165594	1487
Magnetite ()*	Spinel	Fe²⁺Fe³⁺₂O₄			3	165412,165579,165673	14899
Marcasite ()*	Marcasite	FeS₂	204	157	0		5674
Muscovite ()*	Mica Clay	KAl₂(Si₃Al)O₁₀(OH)₂			11	165419,165424,165425,165434,165438,165441,165461,165464,165494,165608,165627	17380
Naumannite ()*	Not in a structural group	Ag₂Se			2	165371,165494	192
Opal ()*	Amorphous	SiO₂·nH₂O			1	165487	2994
Petzite ()*	None	Ag₃AuTe₂			2	165371,165494	409
Pyrargyrite ()*	None	Ag₃SbS₃			1	165608	1425
Pyrite ()*	Pyrite	FeS₂			32	165371,165386,165389,165400,165412,165417,165419,165424,165425,165434,165437,165438,165440,165441,165444,165448,165450,165461,165464,165479,165491,165492,165494,165498,165546,165579,165608,165612,165621,165627,165629,165676	39462
Pyrrhotite ()*	Nickeline	Fe₇S₈			2	165412,165517	9056
Quartz ()*	Quartz	SiO₂	157	157	251	165360,165362,165363,165364,165365,165366,165368,165369,165372,165373,165374,165376,165378,165379,165380,165383,165385,165386,165388,165389,165390,165391,165393,165397,165399,165401,165403,165404,165406,165407,165408,165409,165411,165412,165413,165414,165415,165417,165418,165419,165420,165421,165422,165424,165425,165430,165431,165432,165433,165434,165435,165436,165438,165439,165440,165441,165443,165444,165445,165446,165448,165449,165450,165451,165452,165453,165454,165456,165457,165459,165460,165461,165462,165463,165464,165466,165468,165470,165471,165474,165475,165477,165478,165479,165480,165481,165483,165485,165486,165487,165488,165489,165491,165492,165493,165494,165495,165498,165499,165501,165502,165503,165504,165505,165506,165507,165509,165510,165511,165512,165513,165514,165515,165518,165519,165520,165521,165522,165523,165524,165525,165526,165527,165528,165529,165530,165531,165532,165533,165534,165536,165537,165538,165539,165540,165542,165543,165544,165545,165546,165547,165548,165549,165550,165551,165553,165554,165555,165556,165557,165559,165560,165561,165562,165563,165564,165565,165566,165567,165568,165569,165570,165571,165574,165575,165578,165581,165582,165583,165585,165586,165588,165589,165590,165591,165592,165595,165596,165597,165598,165599,165600,165601,165602,165603,165608,165610,165611,165612,165613,165614,165615,165616,165618,165619,165620,165621,165622,165623,165624,165625,165626,165627,165628,165629,165630,165632,165633,165634,165635,165636,165637,165638,165639,165640,165641,165642,165643,165644,165645,165646,165647,165649,165652,165654,165655,165656,165657,165658,165659,165660,165661,165663,165664,165665,165667,165668,165669,165670,165671,165673,165675,165676,165677,165678,165680,165683,165684,165693,165695,165696	61156
Scheelite ()*	Scheelite	Ca(WO₄)			5	165416,165494,165499,165609,165629	4894
Sphalerite ()*	Sphalerite	ZnS			17	165419,165424,165425,165434,165437,165438,165440,165441,165444,165450,165461,165491,165492,165494,165498,165608,165627	21482
Stephanite ()*	None	Ag₅SbS₄			1	165608	586
Talc ()*	Clay Talc	Mg₃Si₄O₁₀(OH)₂	157	157	2	165494,165575	3337
Tetrahedrite-(Zn) ()*	Tetrahedrite	Cu₆(Cu₄Zn₂)Sb₄S₁₃			1	165437	5317
Wollastonite ()*	Wollastonite	CaSiO₃	204	157	0		1247

9 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-00175	157	157	Middle Jurassic	Cr	83807	Alta Hill Mine (Alta Hill; Alta Hill Chrome Mine), Grass Valley, Grass Valley District, Nevada Co., California, USA	Alta Hill	Moiser et al. (2012)	USGSSIR2012_5157
podchrome-00180	204	204	Upper Triassic-Lower Jurassic or older (204±2 Ma U-Pb zircon on leucodiorite)	Cr	84039	Dickerson Property, Grass Valley, Grass Valley District, Nevada Co., California, USA	Dickerson Property	Moiser et al. (2012)	USGSSIR2012_5157
podchrome-00177	157	157	Middle Jurassic	Cr	84124	Geach Property, Grass Valley, Grass Valley District, Nevada Co., California, USA	Geach	Moiser et al. (2012)	USGSSIR2012_5157
podchrome-00174	157	157	Middle Jurassic	Cr	84231	Holseman Mine, Grass Valley, Grass Valley District, Nevada Co., California, USA	Holseman	Moiser et al. (2012)	USGSSIR2012_5157
podchrome-00176	157	157	Middle Jurassic	Cr	84753	Spring Hill Occurrence, Grass Valley, Grass Valley District, Nevada Co., California, USA	Spring Hill	Moiser et al. (2012)	USGSSIR2012_5157
podchrome-00181	204	204	Upper Triassic-Lower Jurassic or older (204±2 Ma U-Pb zircon on leucodiorite)	Cr	83896	Bowden Prospect, La Barr Meadows, Grass Valley District, Nevada Co., California, USA	Bowden	Moiser et al. (2012)	USGSSIR2012_5157
podchrome-00173	157	157	Middle Jurassic	Cr	83973	Codd Prospects, Newtown, Grass Valley District, Nevada Co., California, USA	Codd	Moiser et al. (2012)	USGSSIR2012_5157
podchrome-00172	157	157	Middle Jurassic	Cr	84455	Mulcahy Prospect, Newtown, Grass Valley District, Nevada Co., California, USA	Mulcahy	Moiser et al. (2012)	USGSSIR2012_5157
podchrome-00170	157	157	Middle Jurassic	Cr	84595	Porter Property, Newtown, Grass Valley District, Nevada Co., California, USA	Porter Property	Moiser et al. (2012)	USGSSIR2012_5157

Sample	Source Locality	Reference URL

All locality data graciously provided by mindat.org

All age data...