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:
Hycroft Mine (Crofoot-Lewis Mine; Standard Slag Mine; Crofoot Gold Project; Crofoot Project; Crofoot Mine; Lewis Mine; Hycroft-Lewis Mine; Brimstone; Gap; Graveyard [Boneyard]; North Pit; South Central Pit; South Extension Pit; Peninsula), Sulphur, Sulphur District, Humboldt Co., Nevada, USA

mindat Locality ID: 61927
mindat URL: http://www.mindat.org/loc-61927.html

Tectonic Settings:

Total number of sublocalities beneath "Hycroft Mine (Crofoot-Lewis Mine; Standard Slag Mine; Crofoot Gold Project; Crofoot Project; Crofoot Mine; Lewis Mine; Hycroft-Lewis Mine; Brimstone; Gap; Graveyard [Boneyard]; North Pit; South Central Pit; South Extension Pit; Peninsula), Sulphur, Sulphur District, Humboldt Co., Nevada, USA": 2
Total number of bottom-level sublocalities: 2

Number of Child Localities: 2
Child Localities:
Devil's Corral Calcite-Gypsum Occurrence
Lewis Pit

Latitude: 40°52'8"N
Longitude: 118°41'16"W
Decimal Degree (lat, lon): 40.868888888889,-118.68777777778

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	Alunite	Amorphous	Calcite	Chalcopyrite	Clay	Copper	Corundum	Diaspore	Gypsum
Marcasite	Mica	Mordenite	Nickeline	None	Not in a structural group	Pyrite	Quartz	Rocksalt	Rutile
Smectite-vermiculite	Sphalerite	Stibnite	Sulphur	Wurtzite

Acanthite ()*	Alunite ()*	Calcite ()*	Chalcopyrite ()*	Chlorargyrite ()*
Cinnabar ()*	Eucairite ()*	Galena ()*	Goethite ()*	Gold ()*
Gypsum ()*	Halite ()*	Hematite ()*	Iodargyrite ()*	Jarosite ()*
Marcasite ()*	Miargyrite ()*	Montmorillonite ()*	Mordenite ()*	Muscovite ()*
Natroalunite ()*	Naumannite ()*	Opal ()*	Pyrite ()*	Pyrrhotite ()*
Quartz ()*	Rutile ()*	Selenium ()*	Siderite ()*	Sphalerite ()*
Stibnite ()*	Stromeyerite ()*	Sulphur ()*	Sylvite ()*	Tiemannite ()*

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 Au C Ca Cl Cu Fe H Hg I K Mg Na O Pb S Sb Se Si Ti Zn

Elements from minerals reported directly at this locality: Ag Al C Ca Cl Cu Fe H Hg I K Mg Na O Pb S Sb Se Si Ti Zn

Structural Groups for minerals in this locality:
Acanthite Alunite Amorphous Calcite Chalcopyrite Clay Copper Corundum Diaspore Gypsum
Marcasite Mica Mordenite Nickeline None Not in a structural group Pyrite Quartz Rocksalt Rutile
Smectite-vermiculite Sphalerite Stibnite Sulphur Wurtzite

35 IMA Minerals at location:

Mineral name	Structural Groups	IMA Formula	# of Sublocalities containing mineral	LOCALITY IDs, not mindat ids	# of localities containing mineral
Acanthite ()*	Acanthite	Ag₂S	1	237525	2793
Alunite ()*	None	KAl₃(SO₄)₂(OH)₆	0		966
Calcite ()*	Calcite	Ca(CO₃)	1	237524	27770
Chalcopyrite ()*	Chalcopyrite	CuFeS₂	0		27198
Chlorargyrite ()*	Rocksalt	AgCl	0		1382
Cinnabar ()*	None	HgS	0		2600
Eucairite ()*	None	CuAgSe	0		54
Galena ()*	Rocksalt	PbS	0		24243
Goethite ()*	Diaspore	FeO(OH)	0		7437
Gold ()*	Copper	Au	1	237525	30554
Gypsum ()*	Gypsum	Ca(SO₄)·2H₂O	1	237524	6890
Halite ()*	Rocksalt	NaCl	1	237525	1398
Hematite ()*	Corundum	Fe₂O₃	0		14640
Iodargyrite ()*	Wurtzite	AgI	0		180
Jarosite ()*	Alunite	KFe³⁺₃(SO₄)₂(OH)₆	0		2228
Marcasite ()*	Marcasite	FeS₂	0		5674
Miargyrite ()*	None	AgSbS₂	0		300
Montmorillonite ()*	Clay Smectite-vermiculite	(Na,Ca)_0.3(Al,Mg)₂Si₄O₁₀(OH)₂·nH₂O	0		1508
Mordenite ()*	Mordenite	(Na₂,Ca,K₂)₄(Al₈Si₄₀)O₉₆·28H₂O	0		405
Muscovite ()*	Mica Clay	KAl₂(Si₃Al)O₁₀(OH)₂	0		17380
Natroalunite ()*	Alunite	NaAl₃(SO₄)₂(OH)₆	0		128
Naumannite ()*	Not in a structural group	Ag₂Se	0		192
Opal ()*	Amorphous	SiO₂·nH₂O	1	237525	2994
Pyrite ()*	Pyrite	FeS₂	0		39462
Pyrrhotite ()*	Nickeline	Fe₇S₈	0		9056
Quartz ()*	Quartz	SiO₂	1	237525	61156
Rutile ()*	Rutile	TiO₂	0		5614
Selenium ()*	Sulphur	Se	0		143
Siderite ()*	Calcite	Fe(CO₃)	0		6417
Sphalerite ()*	Sphalerite	ZnS	0		21482
Stibnite ()*	Stibnite	Sb₂S₃	0		3418
Stromeyerite ()*	None	CuAgS	1	237525	332
Sulphur ()*	Sulphur	S	0		2045
Sylvite ()*	Rocksalt	KCl	1	237525	275
Tiemannite ()*	Sphalerite	HgSe	1	237525	83

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...