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:
Empire West Mine (Lone Ridge), Empire Star Group (Empire Star Mines Company Holdings), Grass Valley, Grass Valley District, Nevada Co., California, USA

mindat Locality ID: 84078
mindat URL: http://www.mindat.org/loc-84078.html

Tectonic Settings:

Total number of sublocalities beneath "Empire West Mine (Lone Ridge), Empire Star Group (Empire Star Mines Company Holdings), Grass Valley, Grass Valley District, Nevada Co., California, USA": 6
Total number of bottom-level sublocalities: 4

Number of Child Localities: 4
Child Localities:
Lone Jack Quartz Mine (Lone Jack Mine)
Omaha Consolidated Mine (Omaha Cons.; Lone Jack Mine; Omaha Vein)
Wisconsin No. 2 Lode Mine
Wisconsin Quartz Mine (Menlo; Wisconsin-Illinois; Wisconsin And Illinois Claim)

Latitude: 39°11'30"N
Longitude: 121°3'49"W
Decimal Degree (lat, lon): 39.191666666667,-121.06361111111

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	Chalcopyrite	Clay	Copper	Mica	None	Pyrite	Quartz	Rocksalt	Sphalerite

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: Al Au C Ca Cu Fe H K Mo O Pb S Si Zn

Elements from minerals reported directly at this locality:

Structural Groups for minerals in this locality:
Calcite Chalcopyrite Clay Copper Mica None Pyrite Quartz Rocksalt Sphalerite

10 IMA Minerals at location:

Ankerite ()*	Calcite ()*	Chalcopyrite ()*	Ferrimolybdite ()*	Galena ()*
Gold ()*	Muscovite ()*	Pyrite ()*	Quartz ()*	Sphalerite ()*

Mineral name	Structural Groups	IMA Formula	# of Sublocalities containing mineral	LOCALITY IDs, not mindat ids	# of localities containing mineral
Ankerite ()*	None	Ca(Fe²⁺,Mg)(CO₃)₂	1	165419	3092
Calcite ()*	Calcite	Ca(CO₃)	1	165419	27770
Chalcopyrite ()*	Chalcopyrite	CuFeS₂	1	165419	27198
Ferrimolybdite ()*	None	Fe³⁺₂(Mo⁶⁺O₄)₃·7H₂O	1	165422	345
Galena ()*	Rocksalt	PbS	1	165419	24243
Gold ()*	Copper	Au	5	165418,165419,165420,165421,165422	30554
Muscovite ()*	Mica Clay	KAl₂(Si₃Al)O₁₀(OH)₂	1	165419	17380
Pyrite ()*	Pyrite	FeS₂	1	165419	39462
Quartz ()*	Quartz	SiO₂	5	165418,165419,165420,165421,165422	61156
Sphalerite ()*	Sphalerite	ZnS	1	165419	21482

No ages have been assigned to this locality yet.

Sample	Source Locality	Reference URL

All locality data graciously provided by mindat.org

All age data...