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:
Fergus Co., Montana, USA

Oldest recorded age at locality: 73.3
Youngest recorded age at locality: 53.7

mindat Locality ID: 50253
mindat URL: http://www.mindat.org/loc-50253.html

Tectonic Settings:

Total number of sublocalities beneath "Fergus Co., Montana, USA": 155
Total number of bottom-level sublocalities: 149

Number of Child Localities: 41
Child Localities:
America Mine
Bay Horse Prospect
Bonanza Group
Castle Butte Occurrence
Cave Prospect (Old Cave)
Federal Reserve Group
Fergus County Silica Sand Deposit
First National Mine
Golden And Dawes Lode Claims
Gyp Basin Occurrence
Hanover Mine
Hard Scrabble Mine
Homestead Kimberlite
Kootenai Formation Clays Occurrence
Lewiston Pit
Lewistown - Maiden Mining District
Lewistown Area
Lewistown Brick & Tile Company
Limestone Occurrence (MRDS - 10173075)
Limestone Occurrence (MRDS - 10269226)
North Moccasin Mining District (Kendall Mining District)
North Moccasin Mountain Occurrence
Paradise Ranch Quarry
Piper Deposit
Republic Mine (Hamilton Lead Prospect; Republic Lode Mining Claim)
Rocky Butte Occurrence
South Moccasin Mts
Surprise Stone Quarry
Sutter Mine (Hamilton-Sutter; Sutter And Dixie Fraction)
Trail Creek Deposit
Unnamed Clay Location (MRDS - 10196472)
Unnamed Clay Location (MRDS - 10196785)
Unnamed Clay Location (MRDS - 10221077)
Unnamed Fluorine-Fluorite Location (MRDS - 10293902)
Unnamed Gypsum-Anhydrite Location (MRDS - 10124164)
Unnamed Silica Location (MRDS - 10245492)
Urbana Prospect
Warm Springs
Warm Springs District (Gilt Edge District; Gold Hill District; Maiden District)
West Armell's Creek Occurrence (West Armells Creek Iron; West Armells Creek Bog Iron)
White & Gilpatrick Claims (G & W Claims; Last Chance And Independent)

Latitude: 47°3'35"N
Longitude: 109°20'35"W
Decimal Degree (lat, lon): 47.059722222222,-109.34305555556

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	Allophane	Amorphous	Baryte	Calcite	Chalcopyrite	Clay	Clinozoisite	Columbite	Copper
Corundum	Diamond	Diaspore	Digenite	Epidote	Feldspar	Fluorite	Germanite	Gypsum	Kaolinite
Malachite	Marcasite	Melonite	Mica	None	Not in a structural group	Olivine	Orpiment	Perovskite	Polybasite
Pyrite	Pyroxene	Quartz	Rocksalt	Rutile	Sphalerite	Spinel	Tetrahedrite

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 C Ca Cu F Fe H Hg K Mg Mn Na O Pb S Sb Si Te Ti V W Zn

Elements from minerals reported directly at this locality:

Structural Groups for minerals in this locality:
Acanthite Allophane Amorphous Baryte Calcite Chalcopyrite Clay Clinozoisite Columbite Copper
Corundum Diamond Diaspore Digenite Epidote Feldspar Fluorite Germanite Gypsum Kaolinite
Malachite Marcasite Melonite Mica None Not in a structural group Olivine Orpiment Perovskite Polybasite
Pyrite Pyroxene Quartz Rocksalt Rutile Sphalerite Spinel Tetrahedrite

62 IMA Minerals at location:

Acanthite ()*	Aegirine ()*	Altaite ()*	Anhydrite ()*	Ankerite ()*
Azurite ()*	Baryte ()*	Benleonardite ()*	Bornite ()*	Calaverite ()*
Calcite ()*	Chalcocite ()*	Chalcopyrite ()*	Chrysocolla ()*	Cinnabar ()*
Colusite ()*	Diamond ()*	Digenite ()*	Diopside ()*	Dolomite ()*
Fluorite ()*	Freibergite ()*	Galena ()*	Goethite ()*	Gold ()*
Graphite ()*	Gypsum ()*	Hematite ()*	Hessite ()*	Hübnerite ()*
Imiterite ()*	Kaolinite ()*	Krennerite ()*	Lenaite ()*	Magnetite ()*
Malachite ()*	Marcasite ()*	Monticellite ()*	Mukhinite ()*	Muscovite ()*
Nagyágite ()*	Opal ()*	Orpiment ()*	Orthoclase ()*	Perovskite ()*
Phlogopite ()*	Polybasite ()*	Proustite ()*	Pyrite ()*	Quartz ()*
Realgar ()*	Roscoelite ()*	Rutile ()*	Silver ()*	Smithsonite ()*
Sphalerite ()*	Spinel ()*	Stützite ()*	Sylvanite ()*	Tellurium ()*
Tennantite-(Fe) ()*	Tetrahedrite-(Zn) ()*

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	73.3	53.7	4	228018,228038,228070,228091	2793
Aegirine ()*	Pyroxene	NaFe³⁺Si₂O₆			1	228101	1022
Altaite ()*	Rocksalt	PbTe	73.3	53.7	1	228038	489
Anhydrite ()*	Not in a structural group	Ca(SO₄)			1	227958	1588
Ankerite ()*	None	Ca(Fe²⁺,Mg)(CO₃)₂	73.3	53.7	1	228038	3092
Azurite ()*	Not in a structural group	Cu₃(CO₃)₂(OH)₂	73.3	53.7	1	228091	5509
Baryte ()*	Baryte	Ba(SO₄)	73.3	53.7	1	228038	11547
Benleonardite ()*	Polybasite	Ag₁₅Cu(Sb,As)₂S₇Te₄	73.3	53.7	1	228038	20
Bornite ()*	None	Cu₅FeS₄	73.3	53.7	1	228038	5516
Calaverite ()*	Melonite	AuTe₂	73.3	53.7	2	228066,228089	361
Calcite ()*	Calcite	Ca(CO₃)	73.3	53.7	4	228018,228038,228048,228091	27770
Chalcocite ()*	None	Cu₂S	73.3	53.7	1	228028	5707
Chalcopyrite ()*	Chalcopyrite	CuFeS₂	73.3	53.7	8	227970,227986,228017,228018,228028,228038,228048,228070	27198
Chrysocolla ()*	Allophane	(Cu_2-xAl_x)H_2-xSi₂O₅(OH)₄·nH₂O	73.3	53.7	2	228070,228091	3531
Cinnabar ()*	None	HgS	73.3	53.7	1	228091	2600
Colusite ()*	Sphalerite Germanite	Cu₁₃VAs₃S₁₆	73.3	53.7	2	228038,228070	110
Diamond ()*	Diamond	C			1	227960	697
Digenite ()*	Digenite	Cu_1.8S	73.3	53.7	1	228038	1027
Diopside ()*	Pyroxene	CaMgSi₂O₆			1	227960	4135
Dolomite ()*	None	CaMg(CO₃)₂	73.3	53.7	1	228038	9895
Fluorite ()*	Fluorite	CaF₂	73.3	53.7	13	227970,228001,228006,228017,228018,228038,228042,228048,228059,228066,228070,228089,228091	9617
Freibergite ()*	Tetrahedrite	Ag₆[Cu₄Fe₂]Sb₄S₁₂	73.3	53.7	1	228038	663
Galena ()*	Rocksalt	PbS	73.3	53.7	9	227970,227977,227986,228017,228018,228028,228038,228066,228089	24243
Goethite ()*	Diaspore	FeO(OH)	73.3	53.7	1	228038	7437
Gold ()*	Copper	Au	73.3	53.7	6	227970,228018,228038,228042,228089,228091	30554
Graphite ()*	None	C			1	228006	2812
Gypsum ()*	Gypsum	Ca(SO₄)·2H₂O			3	227958,227966,228006	6890
Hematite ()*	Corundum	Fe₂O₃	73.3	53.7	1	228038	14640
Hessite ()*	None	Ag₂Te	73.3	53.7	1	228038	804
Hübnerite ()*	Columbite	Mn²⁺(WO₄)			2	227977,227983	469
Imiterite ()*	None	Ag₂HgS₂	73.3	53.7	1	228038	17
Kaolinite ()*	Clay Kaolinite	Al₂Si₂O₅(OH)₄	73.3	53.7	3	228006,228038,228089	5591
Krennerite ()*	None	Au₃AgTe₈	73.3	53.7	1	228038	111
Lenaite ()*	Chalcopyrite	AgFeS₂	73.3	53.7	1	228038	8
Magnetite ()*	Spinel	Fe²⁺Fe³⁺₂O₄	73.3	53.7	2	228006,228038	14899
Malachite ()*	Malachite	Cu₂(CO₃)(OH)₂	73.3	53.7	3	227986,228070,228091	12537
Marcasite ()*	Marcasite	FeS₂	73.3	53.7	1	228038	5674
Monticellite ()*	Olivine	CaMg(SiO₄)			1	227960	153
Mukhinite ()*	Clinozoisite Epidote	Ca₂(Al₂V³⁺)[Si₂O₇][SiO₄]O(OH)			1	227965	5
Muscovite ()*	Mica Clay	KAl₂(Si₃Al)O₁₀(OH)₂	73.3	53.7	2	228006,228038	17380
Nagyágite ()*	None	[Pb₃(Pb,Sb)₃S₆](Au,Te)₃	73.3	53.7	1	228038	67
Opal ()*	Amorphous	SiO₂·nH₂O			1	228006	2994
Orpiment ()*	Orpiment	As₂S₃			1	228006	511
Orthoclase ()*	Feldspar	K(AlSi₃O₈)	73.3	53.7	2	228089,228101	2349
Perovskite ()*	Perovskite	CaTiO₃			1	227960	495
Phlogopite ()*	Mica Clay	KMg₃(AlSi₃O₁₀)(OH)₂			1	227960	2273
Polybasite ()*	Polybasite	[Ag₉CuS₄][(Ag,Cu)₆(Sb,As)₂S₇]	73.3	53.7	2	228038,228091	716
Proustite ()*	None	Ag₃AsS₃	73.3	53.7	1	228038	733
Pyrite ()*	Pyrite	FeS₂	73.3	53.7	8	227970,227977,227986,228006,228018,228028,228038,228048	39462
Quartz ()*	Quartz	SiO₂	73.3	53.7	6	227970,228018,228038,228048,228060,228089	61156
Realgar ()*	None	AsS			1	228006	712
Roscoelite ()*	Mica	KV³⁺₂(Si₃Al)O₁₀(OH)₂	73.3	53.7	4	227959,228038,228066,228089	253
Rutile ()*	Rutile	TiO₂	73.3	53.7	1	228038	5614
Silver ()*	Copper	Ag	73.3	53.7	1	228091	5186
Smithsonite ()*	Calcite	Zn(CO₃)			1	227986	2473
Sphalerite ()*	Sphalerite	ZnS	73.3	53.7	9	227970,227977,227986,228017,228018,228028,228038,228089,228091	21482
Spinel ()*	Spinel	MgAl₂O₄			1	227960	1934
Stützite ()*	None	Ag_5-xTe₃ (x = 0.24-0.36)	73.3	53.7	1	228038	92
Sylvanite ()*	Melonite	AgAuTe₄	73.3	53.7	7	228018,228038,228042,228048,228059,228066,228089	337
Tellurium ()*	None	Te	73.3	53.7	2	228038,228089	190
Tennantite-(Fe) ()*	Tetrahedrite	Cu₆(Cu₄Fe₂)As₄S₁₃	73.3	53.7	1	228038	1803
Tetrahedrite-(Zn) ()*	Tetrahedrite	Cu₆(Cu₄Zn₂)Sb₄S₁₃	73.3	53.7	4	228038,228070,228089,228091	5317

9 Ages assigned to this locality:

Excel ID	Max Age (Ma)	Min Age (Ma)	Age as listed in reference	Dating Method	Sample Source	Sample Num	Minerals explicitely stated as having this age	Age applies to these Elements	MinDat Locality ID	Dated Locality (Max Age)	Reference	Reference ID
Hg-00101	73.3	53.7		K-Ar, F.T.			Imiterite	Hg	50255	Warm Springs District (Gilt Edge District; Gold Hill District; Maiden District), Fergus Co., Montana, USA	Marvin et al. (1980); Zhang and Spry (1994)
NAVDAT-9426	69	64	67+2/-3			9426			162412	Jay Dee No. 3 Prospect, Warm Springs District (Gilt Edge District; Gold Hill District; Maiden District), Fergus Co., Montana, USA	NAVDAT	NAVDAT
NAVDAT-9427	69	68	68.5±0.5			9427			162412	Jay Dee No. 3 Prospect, Warm Springs District (Gilt Edge District; Gold Hill District; Maiden District), Fergus Co., Montana, USA	NAVDAT	NAVDAT
NAVDAT-9430	69	68	68.5±0.5			9430			162412	Jay Dee No. 3 Prospect, Warm Springs District (Gilt Edge District; Gold Hill District; Maiden District), Fergus Co., Montana, USA	NAVDAT	NAVDAT
NAVDAT-9431	69	68	68.5±0.5			9431			162412	Jay Dee No. 3 Prospect, Warm Springs District (Gilt Edge District; Gold Hill District; Maiden District), Fergus Co., Montana, USA	NAVDAT	NAVDAT
NAVDAT-9432	69	68	68.5±0.5			9432			162412	Jay Dee No. 3 Prospect, Warm Springs District (Gilt Edge District; Gold Hill District; Maiden District), Fergus Co., Montana, USA	NAVDAT	NAVDAT
NAVDAT-9434	69	68	68.5±0.5			9434			162412	Jay Dee No. 3 Prospect, Warm Springs District (Gilt Edge District; Gold Hill District; Maiden District), Fergus Co., Montana, USA	NAVDAT	NAVDAT
NAVDAT-9442	69	64	67+2/-3			9442			162412	Jay Dee No. 3 Prospect, Warm Springs District (Gilt Edge District; Gold Hill District; Maiden District), Fergus Co., Montana, USA	NAVDAT	NAVDAT
USGS-U-Th-Pb-00576_207_235	70.9	63.3	67.1±3.8	207_235	sphene				163379	Montago Mine (Collar Gulch Mine), Warm Springs District (Gilt Edge District; Gold Hill District; Maiden District), Fergus Co., Montana, USA	USGS-U-Th-Pb	USGS-U-Th-Pb

Sample	Source Locality	Reference URL

All locality data graciously provided by mindat.org

All age data...