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:
McCoy District, Lander Co., Nevada, USA

Oldest recorded age at locality: 89
Youngest recorded age at locality: 38.82

mindat Locality ID: 36877
mindat URL: http://www.mindat.org/loc-36877.html

Tectonic Settings:

Total number of sublocalities beneath "McCoy District, Lander Co., Nevada, USA": 12
Total number of bottom-level sublocalities: 11

Number of Child Localities: 10
Child Localities:
Big Four Mine
Fish Creek Mts
Gold Dome Mine (Nevada Gold Dome Mine)
Gold Pirate Mine
Gold Pirate Placer
Hancock Mine (Mickey Mine)
McCoy Mine (McCoy-Cove Mine; Cove Mine)
McCoy Mine (Uhalde Mine; New World Mine; Childress Mine; Nevada Iron Mines Mine)
Unnamed Prospect
West Side Placer

Latitude: 40°24'59"N
Longitude: 117°13'"W
Decimal Degree (lat, lon): 40.416388888889,-117.21666666667

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	Aragonite	Argyrodite	Arsenopyrite	Brookite	Calcite	Chalcopyrite	Clay
Copper	Corundum	Digenite	Marcasite	Mica	Molybdenite	Nickeline	None	Not in a structural group	Pentlandite
Phenakite	Pyrite	Quartz	Rocksalt	Rutile	Smectite-vermiculite	Sphalerite	Spinel	Stannite	Tetradymite
Tetrahedrite

Acanthite ()*	Actinolite ()*	Anatase ()*	Arsenopyrite ()*	Brookite ()*
Calcite ()*	Canfieldite ()*	Cassiterite ()*	Cerussite ()*	Chalcopyrite ()*
Chatkalite ()*	Chlorargyrite ()*	Claudetite ()*	Digenite ()*	Dolomite ()*
Freibergite ()*	Galena ()*	Gold ()*	Hedleyite ()*	Hematite ()*
Kësterite ()*	Magnetite ()*	Marcasite ()*	Molybdenite ()*	Montmorillonite ()*
Muscovite ()*	Nontronite ()*	Opal ()*	Gersdorffite-Pa3 ()*	Pyrite ()*
Pyrrhotite ()*	Quartz ()*	Robinsonite ()*	Rutile ()*	Sarcolite ()*
Shadlunite ()*	Silver ()*	Sphalerite ()*	Stannite ()*	Todorokite ()*
Willemite ()*

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 Ba Bi C Ca Cd Cl Cu Fe H K Mg Mn Mo Na Ni O P Pb S Sb Si Sn Sr Te Ti Zn

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

Structural Groups for minerals in this locality:
Acanthite Amorphous Amphibole Aragonite Argyrodite Arsenopyrite Brookite Calcite Chalcopyrite Clay
Copper Corundum Digenite Marcasite Mica Molybdenite Nickeline None Not in a structural group Pentlandite
Phenakite Pyrite Quartz Rocksalt Rutile Smectite-vermiculite Sphalerite Spinel Stannite Tetradymite
Tetrahedrite

41 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	39.42	38.82	1	238127	2793
Actinolite ()*	Amphibole	Ca₂(Mg_4.5-2.5Fe²⁺_0.5-2.5)Si₈O₂₂(OH)₂	89	89	1	238122	3419
Anatase ()*	Not in a structural group	TiO₂	39.42	38.82	1	238127	2162
Arsenopyrite ()*	Arsenopyrite	FeAsS	39.42	38.82	1	238127	9052
Brookite ()*	Brookite	TiO₂	39.42	38.82	1	238127	700
Calcite ()*	Calcite	Ca(CO₃)	89	38.82	3	238120,238127,238128	27770
Canfieldite ()*	Argyrodite	Ag₈SnS₆	39.42	38.82	1	238127	91
Cassiterite ()*	Rutile	SnO₂	39.42	38.82	1	238127	5171
Cerussite ()*	Aragonite	Pb(CO₃)	39.42	38.82	1	238127	4979
Chalcopyrite ()*	Chalcopyrite	CuFeS₂	89	89	1	238122	27198
Chatkalite ()*	None	Cu₆FeSn₂S₈	39.42	38.82	1	238127	8
Chlorargyrite ()*	Rocksalt	AgCl			1	238123	1382
Claudetite ()*	None	As₂O₃	39.42	38.82	1	238127	35
Digenite ()*	Digenite	Cu_1.8S	39.42	38.82	1	238127	1027
Dolomite ()*	None	CaMg(CO₃)₂			2	238126,238128	9895
Freibergite ()*	Tetrahedrite	Ag₆[Cu₄Fe₂]Sb₄S₁₂	39.42	38.82	1	238127	663
Galena ()*	Rocksalt	PbS	39.42	38.82	1	238127	24243
Gold ()*	Copper	Au	39.42	38.82	4	238123,238125,238127,238130	30554
Hedleyite ()*	Tetradymite	Bi₇Te₃	39.42	38.82	1	238127	104
Hematite ()*	Corundum	Fe₂O₃			1	238128	14640
Kësterite ()*	Stannite Sphalerite	Cu₂ZnSnS₄	39.42	38.82	1	238127	82
Magnetite ()*	Spinel	Fe²⁺Fe³⁺₂O₄			2	238126,238128	14899
Marcasite ()*	Marcasite	FeS₂	39.42	38.82	1	238127	5674
Molybdenite ()*	Molybdenite	MoS₂	89	89	1	238122	5800
Montmorillonite ()*	Clay Smectite-vermiculite	(Na,Ca)_0.3(Al,Mg)₂Si₄O₁₀(OH)₂·nH₂O	39.42	38.82	1	238127	1508
Muscovite ()*	Mica Clay	KAl₂(Si₃Al)O₁₀(OH)₂	89	38.82	2	238122,238127	17380
Nontronite ()*	Clay Smectite-vermiculite	Na_0.3Fe³⁺₂(Si,Al)₄O₁₀(OH)₂·nH₂O	39.42	38.82	1	238127	471
Opal ()*	Amorphous	SiO₂·nH₂O	39.42	38.82	0		2994
Gersdorffite-Pa3 ()*	Pyrite	NiAsS	39.42	38.82	1	238127	767
Pyrite ()*	Pyrite	FeS₂	89	38.82	4	238120,238122,238127,238128	39462
Pyrrhotite ()*	Nickeline	Fe₇S₈	89	38.82	2	238122,238127	9056
Quartz ()*	Quartz	SiO₂			3	238120,238121,238128	61156
Robinsonite ()*	None	Pb₄Sb₆S₁₃	39.42	38.82	1	238127	39
Rutile ()*	Rutile	TiO₂	39.42	38.82	1	238127	5614
Sarcolite ()*	None	Na₄Ca₁₂Al₈Si₁₂O₄₆(SiO₄,PO₄)(OH,H₂O)₄(CO₃,Cl)	39.42	38.82	1	238127	6
Shadlunite ()*	Pentlandite	(Fe,Cu)₈(Pb,Cd)S₈	39.42	38.82	1	238127	3
Silver ()*	Copper	Ag	39.42	38.82	1	238127	5186
Sphalerite ()*	Sphalerite	ZnS	89	38.82	2	238120,238127	21482
Stannite ()*	Stannite Sphalerite	Cu₂FeSnS₄	39.42	38.82	1	238127	668
Todorokite ()*	None	(Na,Ca,K,Ba,Sr)_1-x(Mn,Mg,Al)₆O₁₂·3-4H₂O	39.42	38.82	1	238127	433
Willemite ()*	Phenakite	Zn₂SiO₄	39.42	38.82	1	238127	303

Locality Notes from all Ages at Locality:

Age ID	Locality Notes
Michelle_267_a	McCoy skarn and Cove deposits are located in the Fish Creek Mountains, NV. They are approximately 1.6 km apart and formed contemporaneously.
Michelle_268_b	McCoy skarn and Cove deposits are located in the Fish Creek Mountains, NV. They are approximately 1.6 km apart and formed contemporaneously.

3 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	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 ID	Age Notes
PorphCu-00652	89	89	89						Actinolite, Chalcopyrite, Molybdenite, Pyrite, Pyrrhotite	Cu	228007	Fish Creek Prospect, Fish Creek Mts, McCoy District, Lander Co., Nevada, USA	Fish Creek	Singer et al. (2008)	USGSOFR2008_1155
Michelle_267_a	39.42	38.82	39.12±0.30	Ar-Ar	Age of ore formation	high	biotite	4.15E-16			59938	McCoy Mine (McCoy-Cove Mine; Cove Mine), McCoy District, Lander Co., Nevada, USA	McCoy-Cove Mines	Johnston et al. (2008)	EG103_759	See Figure 15B. Age of skarn ore formation at McCoy and Carlin style enrichment/polymetallic vein deposits at Cove from a shared magmatic fluid source.
Michelle_268_b	41.5	41.5	~41.5		Age of pre-ore formation						59938	McCoy Mine (McCoy-Cove Mine; Cove Mine), McCoy District, Lander Co., Nevada, USA	McCoy-Cove Mines	Johnston et al. (2008)	EG103_759	See Figure 18. Age of first stage of magmatism creating a "pre-ore" of granodiorite and subeconomic skarn.

Sample	Source Locality	Reference URL

All locality data graciously provided by mindat.org

All age data...