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:
Placer Co., California, USA

Oldest recorded age at locality: 388
Youngest recorded age at locality: 3.5

mindat Locality ID: 7857
mindat URL: http://www.mindat.org/loc-7857.html

Tectonic Settings:

Total number of sublocalities beneath "Placer Co., California, USA": 1197
Total number of bottom-level sublocalities: 1076

Number of Child Localities: 37
Child Localities:
American River
Bald Rock Mountain
Canada Hill District
Cisco
Clipper Gap
Colfax District (Illinois District)
Damascus District (Sunny South District)
Duncan Peak District
Dutch Flat District (Towle District)
East Belt
Emigrant Gap District (Blue Canyon District)
Forest Hill District
Forest Hill Divide Area
George Slide Mine
Gold Run District
Grizzly Bear House
Hotaling
Iowa Hill District
Last Chance District
Lincoln District
Magra
Marshall Canyon
Michigan Bluff District (Michigan Bluff Deposit)
Midas
Ophir District (Auburn District; Duncan Hill District)
Oro Flame Mine
Penryn District
Ralston Divide District
Rocklin District (Loomis District)
Roseville
Scotts Corner
Snakehead Point
Sugarloaf
Tahoe District
Unnamed Magnesite Occurrences [2]
Westville District
Wheatland District

Latitude: 39°3'14"N
Longitude: 120°51'41"W
Decimal Degree (lat, lon): 39.053888888889,-120.86138888889

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	Amphibole	Arsenopyrite	Brookite	Calcite	Chalcanthite	Chalcopyrite	Chlorite	Clay
Clinozoisite	Cobaltite	Copper	Coquimbite	Corundum	Diamond	Epidote	Feldspar	Garnet	Kaolinite
Malachite	Marcasite	Mica	Millerite	Molybdenite	None	Not in a structural group	Pyrite	Pyroxene	Quartz
Rhodonite	Rocksalt	Rutile	Scheelite	Serpentine	Smectite-vermiculite	Sphalerite	Spinel	Stibnite	Talc
Tetrahedrite	Tourmaline	Vesuvianite	Zircon

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 B C Ca Cl Co Cr Cu F Fe H K Mg Mn Mo Na Ni O Os Pb Pt S Sb Si Th Ti W Zn Zr

Elements from minerals reported directly at this locality: C H Mn O Si

Structural Groups for minerals in this locality:
Acanthite Amorphous Amphibole Arsenopyrite Brookite Calcite Chalcanthite Chalcopyrite Chlorite Clay
Clinozoisite Cobaltite Copper Coquimbite Corundum Diamond Epidote Feldspar Garnet Kaolinite
Malachite Marcasite Mica Millerite Molybdenite None Not in a structural group Pyrite Pyroxene Quartz
Rhodonite Rocksalt Rutile Scheelite Serpentine Smectite-vermiculite Sphalerite Spinel Stibnite Talc
Tetrahedrite Tourmaline Vesuvianite Zircon

69 IMA Minerals at location:

Acanthite ()*	Albite ()*	Alunogen ()*	Ankerite ()*	Anthophyllite ()*
Antigorite ()*	Arsenopyrite ()*	Azurite ()*	Brookite ()*	Calcite ()*
Chalcanthite ()*	Chalcocite ()*	Chalcopyrite ()*	Chlorargyrite ()*	Chromite ()*
Chrysotile ()*	Clinochlore ()*	Cobaltite ()*	Copper ()*	Coquimbite ()*
Cuprite ()*	Diamond ()*	Diopside ()*	Dolomite ()*	Epidote ()*
Galena ()*	Gold ()*	Graphite ()*	Grossular ()*	Hausmannite ()*
Hematite ()*	Hercynite ()*	Ilmenite ()*	Kalinite ()*	Kaolinite ()*
Lechatelierite ()*	Magnesiochromite ()*	Magnesite ()*	Magnetite ()*	Malachite ()*
Manganite ()*	Marcasite ()*	Millerite ()*	Molybdenite ()*	Muscovite ()*
Nontronite ()*	Opal ()*	Osmium ()*	Platinum ()*	Pyrargyrite ()*
Pyrite ()*	Pyrolusite ()*	Quartz ()*	Rhodochrosite ()*	Rhodonite ()*
Rutile ()*	Scheelite ()*	Schorl ()*	Siderite ()*	Silver ()*
Sphalerite ()*	Stibnite ()*	Talc ()*	Tetrahedrite-(Zn) ()*	Thorite ()*
Tremolite ()*	Uvarovite ()*	Vesuvianite ()*	Zircon ()*

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			2	167523,167614	2793
Albite ()*	Feldspar	Na(AlSi₃O₈)			1	167490	8803
Alunogen ()*	Not in a structural group	Al₂(SO₄)₃(H₂O)₁₂·5H₂O			1	167804	272
Ankerite ()*	None	Ca(Fe²⁺,Mg)(CO₃)₂			3	166958,166982,167490	3092
Anthophyllite ()*	Amphibole	Mg₂Mg₅Si₈O₂₂(OH)₂			1	167723	718
Antigorite ()*	Serpentine Clay	Mg₃Si₂O₅(OH)₄	388	388	2	167070,167458	708
Arsenopyrite ()*	Arsenopyrite	FeAsS	388	132	5	166627,166656,166659,166838,167495	9052
Azurite ()*	Not in a structural group	Cu₃(CO₃)₂(OH)₂	170	170	2	166622,167812	5509
Brookite ()*	Brookite	TiO₂			1	167633	700
Calcite ()*	Calcite	Ca(CO₃)	132	132	1	167495	27770
Chalcanthite ()*	Chalcanthite	Cu(SO₄)·5H₂O	170	170	1	167812	925
Chalcocite ()*	None	Cu₂S	170	170	1	167812	5707
Chalcopyrite ()*	Chalcopyrite	CuFeS₂	170	132	25	166623,166640,166663,166685,166703,166705,166751,167177,167179,167494,167495,167497,167501,167506,167519,167523,167530,167578,167590,167595,167614,167752,167802,167803,167812	27198
Chlorargyrite ()*	Rocksalt	AgCl			2	167396,167618	1382
Chromite ()*	Spinel	Fe²⁺Cr₂O₄	388	204	110	166620,166671,166693,166698,166720,166725,166775,166847,166852,166855,166863,166864,166867,166868,166870,166888,166939,166940,166942,166944,166946,166949,166953,166955,166970,166971,166999,167003,167004,167011,167014,167015,167058,167059,167060,167061,167062,167064,167065,167067,167068,167069,167070,167071,167072,167073,167074,167075,167076,167077,167078,167079,167080,167082,167083,167086,167087,167088,167089,167090,167091,167092,167093,167094,167095,167096,167098,167099,167100,167101,167102,167103,167105,167106,167108,167109,167110,167111,167112,167113,167114,167115,167116,167117,167118,167119,167121,167122,167123,167124,167125,167126,167127,167128,167129,167173,167178,167186,167310,167444,167462,167463,167471,167565,167717,167722,167724,167730,167731,167737	3902
Chrysotile ()*	Serpentine Clay	Mg₃Si₂O₅(OH)₄			3	167228,167265,167739	951
Clinochlore ()*	Chlorite Clay	Mg₅Al(AlSi₃O₁₀)(OH)₈			4	166855,166888,167565,167730	1756
Cobaltite ()*	Cobaltite	CoAsS			2	166656,167494	966
Copper ()*	Copper	Cu	170	170	3	166622,167591,167812	3846
Coquimbite ()*	Coquimbite	AlFe₃(SO₄)₆(H₂O)₁₂·6H₂O	170	170	2	167378,167812	136
Cuprite ()*	Not in a structural group	Cu₂O	170	170	1	167812	2970
Diamond ()*	Diamond	C			1	166991	697
Diopside ()*	Pyroxene	CaMgSi₂O₆			1	167748	4135
Dolomite ()*	None	CaMg(CO₃)₂			3	167070,167465,167633	9895
Epidote ()*	Epidote Clinozoisite	Ca₂(Al₂Fe³⁺)[Si₂O₇][SiO₄]O(OH)			4	166740,167131,167181,167745	8173
Galena ()*	Rocksalt	PbS	170	170	35	166630,166635,166636,166641,166685,166734,166750,166751,166763,166800,166875,167340,167453,167495,167499,167503,167507,167509,167518,167519,167523,167530,167532,167533,167572,167578,167583,167588,167595,167598,167609,167614,167617,167618,167812	24243
Gold ()*	Copper	Au	170	170	388	166622,166630,166631,166634,166635,166636,166637,166639,166640,166641,166642,166643,166647,166648,166670,166673,166685,166688,166692,166696,166697,166702,166704,166705,166706,166707,166709,166713,166714,166715,166716,166717,166718,166719,166723,166724,166726,166727,166732,166734,166735,166736,166739,166740,166743,166744,166745,166746,166747,166748,166750,166751,166755,166757,166759,166762,166763,166770,166780,166783,166788,166795,166798,166799,166800,166801,166806,166814,166826,166827,166833,166845,166846,166875,166878,166879,166880,166882,166892,166895,166900,166905,166909,166910,166911,166913,166914,166916,166918,166926,166937,166950,166952,166957,166958,166960,166963,166964,166965,166967,166972,166974,166982,166983,166986,166992,166993,166996,166997,167000,167006,167007,167008,167012,167019,167020,167021,167022,167023,167025,167026,167031,167042,167044,167051,167104,167130,167131,167133,167135,167137,167138,167139,167140,167144,167146,167147,167148,167149,167150,167151,167154,167157,167158,167159,167160,167162,167166,167171,167181,167183,167184,167185,167187,167188,167189,167190,167191,167195,167198,167199,167204,167205,167206,167208,167212,167218,167219,167224,167226,167235,167237,167238,167241,167242,167243,167248,167249,167250,167251,167252,167257,167258,167262,167265,167266,167268,167269,167271,167276,167282,167284,167285,167288,167295,167299,167304,167305,167306,167316,167326,167329,167331,167332,167333,167334,167335,167336,167339,167340,167341,167354,167365,167370,167371,167372,167374,167375,167376,167385,167386,167388,167389,167393,167397,167399,167405,167409,167412,167413,167414,167415,167419,167420,167428,167431,167438,167439,167448,167453,167454,167457,167464,167465,167467,167470,167473,167477,167484,167487,167488,167490,167495,167497,167499,167500,167503,167504,167505,167506,167507,167508,167509,167510,167511,167512,167513,167514,167515,167516,167517,167518,167519,167520,167521,167523,167524,167525,167527,167528,167530,167532,167533,167535,167540,167541,167542,167545,167546,167553,167554,167555,167557,167559,167560,167562,167566,167567,167569,167571,167572,167574,167575,167576,167577,167578,167579,167580,167582,167583,167584,167586,167587,167588,167589,167591,167592,167595,167596,167597,167598,167599,167600,167602,167603,167604,167605,167607,167608,167609,167610,167611,167614,167615,167617,167618,167621,167623,167628,167637,167638,167639,167640,167655,167656,167657,167658,167659,167660,167664,167666,167667,167668,167670,167672,167676,167678,167698,167701,167702,167703,167704,167708,167709,167711,167725,167738,167752,167759,167766,167768,167769,167770,167771,167782,167783,167784,167788,167789,167790,167799,167802,167803,167806,167810,167813,167815,167816	30554
Graphite ()*	None	C			2	166982,167468	2812
Grossular ()*	Garnet	Ca₃Al₂(SiO₄)₃			1	167743	1544
Hausmannite ()*	Spinel	Mn²⁺Mn³⁺₂O₄	132	132	1	167496	350
Hematite ()*	Corundum	Fe₂O₃			3	166620,167175,167633	14640
Hercynite ()*	Spinel	Fe²⁺Al₂O₄			1	167675	407
Ilmenite ()*	Corundum	Fe²⁺Ti⁴⁺O₃			4	166620,166740,167131,167181	5433
Kalinite ()*	None	KAl(SO₄)₂·11H₂O	132	132	2	167378,167496	54
Kaolinite ()*	Clay Kaolinite	Al₂Si₂O₅(OH)₄	170	170	3	167368,167381,167812	5591
Lechatelierite ()*	Amorphous	SiO₂	388	3.5	0		62
Magnesiochromite ()*	Spinel	MgCr₂O₄	388	388	3	166862,167063,167458	311
Magnesite ()*	Calcite	Mg(CO₃)			10	166767,166851,166858,166902,166903,167070,167141,167283,167727,167772	1487
Magnetite ()*	Spinel	Fe²⁺Fe³⁺₂O₄	388	311	7	166620,166740,167011,167131,167175,167181,167458	14899
Malachite ()*	Malachite	Cu₂(CO₃)(OH)₂	132	132	6	166622,166623,167177,167179,167501,167590	12537
Manganite ()*	Rutile	Mn³⁺O(OH)			1	167046	770
Marcasite ()*	Marcasite	FeS₂			1	167595	5674
Millerite ()*	Millerite	NiS			1	166659	1066
Molybdenite ()*	Molybdenite	MoS₂			3	166663,167495,167511	5800
Muscovite ()*	Mica Clay	KAl₂(Si₃Al)O₁₀(OH)₂			4	167040,167495,167530,167633	17380
Nontronite ()*	Clay Smectite-vermiculite	Na_0.3Fe³⁺₂(Si,Al)₄O₁₀(OH)₂·nH₂O			1	166947	471
Opal ()*	Amorphous	SiO₂·nH₂O	388	3.5	0		2994
Osmium ()*	None	Os			1	166928	169
Platinum ()*	Copper	Pt			3	166928,167157,167372	485
Pyrargyrite ()*	None	Ag₃SbS₃			1	167553	1425
Pyrite ()*	Pyrite	FeS₂	170	132	62	166620,166630,166635,166636,166640,166643,166647,166648,166685,166692,166705,166713,166714,166715,166719,166726,166734,166736,166740,166751,166801,167131,167155,167176,167177,167181,167340,167453,167465,167490,167495,167500,167501,167503,167506,167517,167519,167523,167528,167530,167533,167546,167574,167575,167578,167584,167588,167590,167591,167595,167605,167608,167609,167614,167617,167618,167633,167752,167769,167784,167803,167812	39462
Pyrolusite ()*	Rutile	MnO₂			4	166737,167040,167046,167047	3106
Quartz ()*	Quartz	SiO₂	170	132	207	166630,166635,166636,166637,166639,166640,166641,166642,166643,166647,166648,166673,166680,166685,166692,166704,166705,166713,166714,166715,166716,166717,166718,166719,166723,166724,166726,166727,166732,166734,166735,166736,166739,166740,166743,166744,166745,166746,166747,166748,166750,166751,166755,166757,166759,166763,166788,166799,166800,166801,166875,166882,166910,166911,166914,166916,166918,166926,166957,166958,166960,166963,166964,166982,166984,166986,166992,166993,166997,167000,167008,167012,167020,167025,167026,167046,167104,167131,167138,167139,167144,167147,167148,167149,167154,167155,167158,167159,167181,167184,167242,167243,167252,167262,167284,167305,167329,167332,167335,167339,167340,167341,167365,167385,167397,167414,167419,167420,167431,167453,167457,167464,167465,167477,167484,167487,167488,167490,167495,167497,167499,167501,167503,167505,167506,167507,167508,167509,167510,167511,167512,167513,167514,167515,167516,167517,167518,167519,167521,167523,167528,167530,167531,167532,167533,167535,167540,167542,167545,167546,167554,167555,167557,167559,167560,167569,167571,167572,167575,167576,167577,167578,167580,167582,167583,167584,167586,167587,167588,167589,167591,167592,167595,167596,167597,167598,167599,167600,167602,167603,167604,167605,167607,167608,167609,167610,167614,167618,167623,167633,167639,167666,167738,167752,167759,167768,167769,167770,167771,167782,167783,167784,167788,167789,167790,167802,167812	61156
Rhodochrosite ()*	Calcite	Mn(CO₃)	388	3.5	0		1711
Rhodonite ()*	Rhodonite	CaMn₃Mn(Si₅O₁₅)	388	388	3	166950,167040,167047	969
Rutile ()*	Rutile	TiO₂			2	166620,167633	5614
Scheelite ()*	Scheelite	Ca(WO₄)			1	167756	4894
Schorl ()*	Tourmaline	NaFe²⁺₃Al₆(Si₆O₁₈)(BO₃)₃(OH)₃(OH)			1	167633	2705
Siderite ()*	Calcite	Fe(CO₃)			3	166740,167131,167181	6417
Silver ()*	Copper	Ag	170	170	6	167378,167495,167500,167591,167618,167812	5186
Sphalerite ()*	Sphalerite	ZnS	170	170	10	166641,166751,167495,167519,167522,167523,167591,167595,167617,167812	21482
Stibnite ()*	Stibnite	Sb₂S₃			2	167495,167609	3418
Talc ()*	Clay Talc	Mg₃Si₄O₁₀(OH)₂	311	170	6	166686,166705,166982,167011,167104,167812	3337
Tetrahedrite-(Zn) ()*	Tetrahedrite	Cu₆(Cu₄Zn₂)Sb₄S₁₃			8	166715,167378,167495,167511,167520,167574,167579,167591	5317
Thorite ()*	Zircon	Th(SiO₄)			1	166620	1006
Tremolite ()*	Amphibole	Ca₂(Mg_5.0-4.5Fe²⁺_0.0-0.5)Si₈O₂₂(OH)₂			1	167723	2562
Uvarovite ()*	Garnet	Ca₃Cr₂(SiO₄)₃	388	311	9	166855,166862,167014,167109,167186,167458,167565,167730,167737	212
Vesuvianite ()*	Vesuvianite	(Ca,Na)₁₉(Al,Mg,Fe)₁₃(SiO₄)₁₀(Si₂O₇)₄(OH,F,O)₁₀			1	166658	1395
Zircon ()*	Zircon	Zr(SiO₄)			6	166620,166740,166928,167131,167181,167381	5251

35 Ages assigned to this locality:

Excel ID	Max Age (Ma)	Min Age (Ma)	Age as listed in reference	Dating Method	Age Interpret	Sample Source	Sample Num	Age applies to these Elements	MinDat Locality ID	Dated Locality (Max Age)	Location as listed in reference	Reference	Reference ID
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
podchrome-00132	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	85065	Beat Claim, Casa Loma, Dutch Flat District (Towle District), Placer Co., California, USA	Beat Claim	Moiser et al. (2012)	USGSSIR2012_5157
podchrome-00133	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	85480	Julian Claims, Casa Loma, Dutch Flat District (Towle District), Placer Co., California, USA	Julian Claims	Moiser et al. (2012)	USGSSIR2012_5157
podchrome-00134	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	85791	Snakehead Claim (Jumbo Claim; Snakebead [typo]), Casa Loma, Dutch Flat District (Towle District), Placer Co., California, USA	Snakehead Claim	Moiser et al. (2012)	USGSSIR2012_5157
podchrome-00154	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	215876	Buttercup Chrome Occurrence, Lehigh Canyon Patent Property (Poco Tiempo Quartz Mine; Buttercup Chrome Occurrence), Bath, Forest Hill District, Placer Co., California, USA	Buttercup Chrome	Moiser et al. (2012)	USGSSIR2012_5157
podchrome-00155	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	215875	Poco Tiempo Quartz Mine, Lehigh Canyon Patent Property (Poco Tiempo Quartz Mine; Buttercup Chrome Occurrence), Bath, Forest Hill District, Placer Co., California, USA	Poco Tiempo	Moiser et al. (2012)	USGSSIR2012_5157
podchrome-00153	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	85968	Washout Claim, Bath, Forest Hill District, Placer Co., California, USA	Washout Claim	Moiser et al. (2012)	USGSSIR2012_5157
podchrome-00156	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	85103	Black Rock Chrome Deposit, Foresthill, Forest Hill District, Placer Co., California, USA	Black Rock Chrome	Moiser et al. (2012)	USGSSIR2012_5157
podchrome-00158	311	311	Pennsylvanian (304-311 Ma U-Pb zircon from plagiogranite)					Cr	85331	Fiddler's Green Deposit (Farmer Property), Todd Valley, Forest Hill District, Placer Co., California, USA	Fiddler's Green	Moiser et al. (2012)	USGSSIR2012_5157
podchrome-00157	311	311	Pennsylvanian (304-311 Ma U-Pb zircon from plagiogranite)					Cr	85348	Gas Canyon Claim, Todd Valley, Forest Hill District, Placer Co., California, USA	Gas Canyon Claim	Moiser et al. (2012)	USGSSIR2012_5157
podchrome-00145	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	85107	Blue Bell And Bee Bee Claims (Blue Bell & Bee Bee Claims), Hughes Mill, Forest Hill Divide Area, Placer Co., California, USA	Blue Bell and Bee Bee Claims	Moiser et al. (2012)	USGSSIR2012_5157
podchrome-00139	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	85121	Boiler Pit Mine (Victory Chrome Company Deposit; Sugar Pine Chrome Mines), Hughes Mill, Forest Hill Divide Area, Placer Co., California, USA	Boiler Pit	Moiser et al. (2012)	USGSSIR2012_5157
podchrome-00144	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	85161	Buzzard And Blue Jay Claims (Buzzard & Blue Jay), Hughes Mill, Forest Hill Divide Area, Placer Co., California, USA	Buzzard and Blue Jay Claims	Moiser et al. (2012)	USGSSIR2012_5157
podchrome-00141	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	85315	Esther And Phyllis Mine (Esther & Phyllis), Hughes Mill, Forest Hill Divide Area, Placer Co., California, USA	Esther and Phyllis	Moiser et al. (2012)	USGSSIR2012_5157
podchrome-00148	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	85411	Green's Capco Leases Mine (Greens Capco), Hughes Mill, Forest Hill Divide Area, Placer Co., California, USA	Green's CAPCO (NE Section 32)	Moiser et al. (2012)	USGSSIR2012_5157
podchrome-00149	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	85411	Green's Capco Leases Mine (Greens Capco), Hughes Mill, Forest Hill Divide Area, Placer Co., California, USA	Green's CAPCO (NE Section 31)	Moiser et al. (2012)	USGSSIR2012_5157
podchrome-00138	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	85530	Long Pit & Yellow Pit Deposits (Long Pit; Yellow Pit Deposits), Hughes Mill, Forest Hill Divide Area, Placer Co., California, USA	Yellow Pit	Moiser et al. (2012)	USGSSIR2012_5157
podchrome-00146	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	85551	Maralls' Capco Leases Mine (Maralls Capco Leases), Hughes Mill, Forest Hill Divide Area, Placer Co., California, USA	CAPCO (NE)	Moiser et al. (2012)	USGSSIR2012_5157
podchrome-00147	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	85551	Maralls' Capco Leases Mine (Maralls Capco Leases), Hughes Mill, Forest Hill Divide Area, Placer Co., California, USA	CAPCO (SE)	Moiser et al. (2012)	USGSSIR2012_5157
podchrome-00142	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	85687	Port Wine Mine, Hughes Mill, Forest Hill Divide Area, Placer Co., California, USA	Dart and Braden (Section 30)	Moiser et al. (2012)	USGSSIR2012_5157
podchrome-00143	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	85687	Port Wine Mine, Hughes Mill, Forest Hill Divide Area, Placer Co., California, USA	Dart and Braden (Section 31)	Moiser et al. (2012)	USGSSIR2012_5157
podchrome-00137	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	85711	Randall Claims Nos. 1 & 2, Hughes Mill, Forest Hill Divide Area, Placer Co., California, USA	Randall Claims	Moiser et al. (2012)	USGSSIR2012_5157
podchrome-00151	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	85798	Southern Pacific Property (Gore; Garrison; G.H.; Muller And Mathews Lease; Fitgerald And Russel Lease; Lookout; Bell Occurrence; King Occurrence), Hughes Mill, Forest Hill Divide Area, Placer Co., California, USA	Southern Pacific (east workings)	Moiser et al. (2012)	USGSSIR2012_5157
podchrome-00150	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	85824	Sunset Mine (Sun Set Chrome Mine; Sugar Pine Chrome Mine), Hughes Mill, Forest Hill Divide Area, Placer Co., California, USA	Sunset	Moiser et al. (2012)	USGSSIR2012_5157
podchrome-00160	204	204	Upper Triassic-Lower Jurassic or older (204±2 Ma U-Pb zircon on leucodiorite)					Cr	85096	Black Arrow Ranch Deposit, Hotaling, Placer Co., California, USA	Black Arrow Ranch	Moiser et al. (2012)	USGSSIR2012_5157
podchrome-00159	204	204	Upper Triassic-Lower Jurassic or older (204±2 Ma U-Pb zircon on leucodiorite)					Cr	85653	Parker Ranch Chromite Deposit (McNear Property; Meadowbrook Ranch; Auburn Chrome Mine), Hotaling, Placer Co., California, USA	Parker Ranch	Moiser et al. (2012)	USGSSIR2012_5157
podchrome-00152	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	85152	Bunker Mine (Bunker Mines; Blue Bird Mine [1880's]; Bay Tree Prospect; Sunnyside Occurrence), Sage Hill, Michigan Bluff District (Michigan Bluff Deposit), Placer Co., California, USA	Bunker (main)	Moiser et al. (2012)	USGSSIR2012_5157
podchrome-00140	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	85600	Mountain View Group (Manzanita Chrome Mine [1918]; Victory Chrome Company), Sage Hill, Michigan Bluff District (Michigan Bluff Deposit), Placer Co., California, USA	Mountain View	Moiser et al. (2012)	USGSSIR2012_5157
USGS-Rb-Sr-05952	132	132	132	Rb-Sr	age not evaluated	whole rock			85233	Davenport Mine, Auburn, Ophir District (Auburn District; Duncan Hill District), Placer Co., California, USA		USGS-Rb-Sr	USGS-Rb-Sr
podchrome-00136	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	85616	North Fork Chrome Mine, Snakehead Point, Placer Co., California, USA	North Fork Chrome	Moiser et al. (2012)	USGSSIR2012_5157
podchrome-00135	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	85975	West Chrome Mine (Knob Hill Prospect; West Prospect), Snakehead Point, Placer Co., California, USA	West Chrome	Moiser et al. (2012)	USGSSIR2012_5157
NAVDAT-130807	6	3.5	4.75±1.25				130807		215816	Carnelian Bay, Tahoe District, Placer Co., California, USA		NAVDAT	NAVDAT
NAVDAT-130898	3.97	3.69	3.83±0.14				130898		85558	Marrs Mine, Westville, Westville District, Placer Co., California, USA		NAVDAT	NAVDAT
vms-01028	170	170	Jurassic					S	85223	Dairy Farm Mine (Trent; Vantrent Mine), Kilaga Springs, Wheatland District, Placer Co., California, USA	Dairy Farm	Moiser et al. (2009)	USGSOFR2009_1034
vms-01045	170	170	Jurassic					S	85950	Valley View Mine (Whiskey Hill Mine; Whiskey Diggings; Whislcey Diggings; Harpening Kilaga Springs; Harpending Mine; Bonanza [?]), Kilaga Springs, Wheatland District, Placer Co., California, USA	Valley View	Moiser et al. (2009)	USGSOFR2009_1034

Sample	Source Locality	Reference URL

All locality data graciously provided by mindat.org

All age data...