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Geis Mine (Red Metal Claim group; Gies Mine; Elk Peak project; Bertha claim group), Cone Butte Sub-District, Warm Springs District (Gilt Edge District; Gold Hill District; Maiden District), Fergus County, Montana, USAi
Regional Level Types
Geis Mine (Red Metal Claim group; Gies Mine; Elk Peak project; Bertha claim group)Mine
Cone Butte Sub-DistrictSubdistrict
Warm Springs District (Gilt Edge District; Gold Hill District; Maiden District)Mining District
Fergus CountyCounty
MontanaState
USACountry

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Latitude & Longitude (WGS84):
47° 13' 16'' North , 109° 9' 43'' West
Latitude & Longitude (decimal):
47.22132,-109.16219
GRN:
N32W54
Type:
Mine
Köppen climate type:
Dfb : Warm-summer humid continental climate
Nearest Settlements:
PlacePopulationDistance
Roy108 (2011)19.6km
Lewistown5,874 (2017)26.8km
Lewistown Heights407 (2011)27.3km
Grass Range110 (2011)34.7km
Winifred205 (2017)40.7km
Mindat Locality ID:
107292
Long-form identifier:
mindat:1:2:107292:4
GUID (UUID V4):
0


A group of 11 patented claims between Armells Creek and Ford Creek about 3 miles NW of old Fort Maginnis.

Mineralization is a Ag-Pb-Zn deposit along the contact between limestone and syenite porphyry.


Property is developed by adits and shafts.

Average grade of 13.7g/t, but high grade to 13,714 g/t.
Unknown of composition - (Ag,Cu)9(As,Sb)(Te,S)6

The Gies Au-Ag-Te deposit is an epithermal vein system that occurs along the contact between intrusive rocks of the CretaceousTertiary Elk Creek laccolith (syenite, monzonite porphyry, and monzonite) with the Cretaceous Kootenai Formation (sandstone). Tinguaite porphyry dykes (up to 10 m wide and 1.5 km in length) cross-cut these rocks and pre-date and postdate mineralisation. Tellurides are mainly found in two NNW-trending veins that are up to 2 m wide and extend for ~ 500m. A second set of veins trends ENE and where it intersects the first set, the highest gold grades are observed, locally as stockworks.

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Commodity List

This is a list of exploitable or exploited mineral commodities recorded at this locality.


Mineral List


36 valid minerals.

Rock Types Recorded


Select Rock List Type

Alphabetical List Tree Diagram

Detailed Mineral List:

ⓘ Acanthite
Formula: Ag2S
ⓘ Altaite
Formula: PbTe
ⓘ Ankerite
Formula: Ca(Fe2+,Mg)(CO3)2
ⓘ Baryte
Formula: BaSO4
ⓘ Benleonardite
Formula: [Ag6(Sb,As)2S6Te][Ag9Cu(S,Te)2Te2]
ⓘ Bornite
Formula: Cu5FeS4
ⓘ Calcite
Formula: CaCO3
ⓘ Chalcopyrite
Formula: CuFeS2
ⓘ 'Chlorite Group'
ⓘ Clinozoisite
Formula: (CaCa)(AlAlAl)O[Si2O7][SiO4](OH)
ⓘ Colusite
Formula: Cu13VAs3S16
ⓘ Digenite
Formula: Cu9S5
ⓘ Dolomite
Formula: CaMg(CO3)2
ⓘ Fluorite
Formula: CaF2
ⓘ 'Freibergite Subgroup'
Formula: (Ag6,[Ag6]4+)(Cu4 C2+2)Sb4S12S0-1
ⓘ Galena
Formula: PbS
ⓘ Goethite
Formula: Fe3+O(OH)
ⓘ Hematite
Formula: Fe2O3
ⓘ Hessite
Formula: Ag2Te
ⓘ Imiterite
Formula: Ag2HgS2
ⓘ Kaolinite
Formula: Al2(Si2O5)(OH)4
ⓘ 'K Feldspar'
ⓘ 'K Feldspar var. Adularia'
Formula: KAlSi3O8
ⓘ Krennerite
Formula: Au3AgTe8
ⓘ Lenaite
Formula: AgFeS2
ⓘ Magnetite
Formula: Fe2+Fe3+2O4
ⓘ Marcasite
Formula: FeS2
ⓘ Muscovite
Formula: KAl2(AlSi3O10)(OH)2
ⓘ Muscovite var. Sericite
Formula: KAl2(AlSi3O10)(OH)2
ⓘ Nagyágite
Formula: [Pb3(Pb,Sb)3S6](Au,Te)3
ⓘ Native Gold
Formula: Au
ⓘ Native Gold var. Electrum
Formula: (Au,Ag)
ⓘ Native Tellurium
Formula: Te
ⓘ Polybasite
Formula: [Ag6Sb2S7][Ag9CuS4]
ⓘ Proustite
Formula: Ag3AsS3
ⓘ Pyrite
Formula: FeS2
ⓘ Quartz
Formula: SiO2
ⓘ Roscoelite
Formula: KV3+2(AlSi3O10)(OH)2
ⓘ Rutile
Formula: TiO2
ⓘ Sphalerite
Formula: ZnS
ⓘ Stützite
Formula: Ag5-xTe3, x = 0.24-0.36
ⓘ Sylvanite
Formula: AgAuTe4
ⓘ 'Tennantite Subgroup'
Formula: Cu6(Cu4C2+2)As4S12S
ⓘ 'Tetrahedrite Subgroup'
Formula: Cu6(Cu4C2+2)Sb4S12S

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
ⓘNative Gold
var. Electrum		1.AA.05(Au,Ag)
ⓘ1.AA.05Au
ⓘNative Tellurium1.CC.10Te
Group 2 - Sulphides and Sulfosalts
ⓘDigenite2.BA.10Cu9S5
ⓘBornite2.BA.15Cu5FeS4
ⓘAcanthite2.BA.35Ag2S
ⓘHessite2.BA.60Ag2Te
ⓘStützite2.BA.65Ag5-xTe3, x = 0.24-0.36
ⓘImiterite2.BD.05Ag2HgS2
ⓘSphalerite2.CB.05aZnS
ⓘChalcopyrite2.CB.10aCuFeS2
ⓘLenaite2.CB.10aAgFeS2
ⓘColusite2.CB.30Cu13VAs3S16
ⓘAltaite2.CD.10PbTe
ⓘGalena2.CD.10PbS
ⓘSylvanite2.EA.05AgAuTe4
ⓘKrennerite2.EA.15Au3AgTe8
ⓘPyrite2.EB.05aFeS2
ⓘMarcasite2.EB.10aFeS2
ⓘProustite2.GA.05Ag3AsS3
ⓘ'Freibergite Subgroup'2.GB.05(Ag6,[Ag6]4+)(Cu4 C2+2)Sb4S12S0-1
ⓘ'Tennantite Subgroup'2.GB.05Cu6(Cu4C2+2)As4S12S
ⓘ'Tetrahedrite Subgroup'2.GB.05Cu6(Cu4C2+2)Sb4S12S
ⓘPolybasite2.GB.15[Ag6Sb2S7][Ag9CuS4]
ⓘNagyágite2.HB.20a[Pb3(Pb,Sb)3S6](Au,Te)3
ⓘBenleonardite2.LA.50[Ag6(Sb,As)2S6Te][Ag9Cu(S,Te)2Te2]
Group 3 - Halides
ⓘFluorite3.AB.25CaF2
Group 4 - Oxides and Hydroxides
ⓘMagnetite4.BB.05Fe2+Fe3+2O4
ⓘHematite4.CB.05Fe2O3
ⓘQuartz4.DA.05SiO2
ⓘRutile4.DB.05TiO2
ⓘGoethite4.FD.10Fe3+O(OH)
Group 5 - Nitrates and Carbonates
ⓘCalcite5.AB.05CaCO3
ⓘAnkerite5.AB.10Ca(Fe2+,Mg)(CO3)2
ⓘDolomite5.AB.10CaMg(CO3)2
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
ⓘBaryte7.AD.35BaSO4
Group 9 - Silicates
ⓘClinozoisite9.BG.05a(CaCa)(AlAlAl)O[Si2O7][SiO4](OH)
ⓘMuscovite9.EC.15KAl2(AlSi3O10)(OH)2
ⓘRoscoelite9.EC.15KV3+2(AlSi3O10)(OH)2
ⓘMuscovite
var. Sericite		9.EC.15KAl2(AlSi3O10)(OH)2
ⓘKaolinite9.ED.05Al2(Si2O5)(OH)4
Unclassified
ⓘ'K Feldspar
var. Adularia'		-KAlSi3O8
ⓘ'Chlorite Group'-
ⓘ'K Feldspar'-

List of minerals for each chemical element

HHydrogen
Hⓘ Clinozoisite(CaCa)(AlAlAl)O[Si2O7][SiO4](OH)
Hⓘ GoethiteFe3+O(OH)
Hⓘ KaoliniteAl2(Si2O5)(OH)4
Hⓘ MuscoviteKAl2(AlSi3O10)(OH)2
Hⓘ RoscoeliteKV23+(AlSi3O10)(OH)2
Hⓘ Muscovite var. SericiteKAl2(AlSi3O10)(OH)2
CCarbon
Cⓘ AnkeriteCa(Fe2+,Mg)(CO3)2
Cⓘ CalciteCaCO3
Cⓘ DolomiteCaMg(CO3)2
OOxygen
Oⓘ K Feldspar var. AdulariaKAlSi3O8
Oⓘ AnkeriteCa(Fe2+,Mg)(CO3)2
Oⓘ BaryteBaSO4
Oⓘ CalciteCaCO3
Oⓘ Clinozoisite(CaCa)(AlAlAl)O[Si2O7][SiO4](OH)
Oⓘ DolomiteCaMg(CO3)2
Oⓘ GoethiteFe3+O(OH)
Oⓘ HematiteFe2O3
Oⓘ KaoliniteAl2(Si2O5)(OH)4
Oⓘ MagnetiteFe2+Fe23+O4
Oⓘ MuscoviteKAl2(AlSi3O10)(OH)2
Oⓘ QuartzSiO2
Oⓘ RoscoeliteKV23+(AlSi3O10)(OH)2
Oⓘ RutileTiO2
Oⓘ Muscovite var. SericiteKAl2(AlSi3O10)(OH)2
FFluorine
Fⓘ FluoriteCaF2
MgMagnesium
Mgⓘ AnkeriteCa(Fe2+,Mg)(CO3)2
Mgⓘ DolomiteCaMg(CO3)2
AlAluminium
Alⓘ K Feldspar var. AdulariaKAlSi3O8
Alⓘ Clinozoisite(CaCa)(AlAlAl)O[Si2O7][SiO4](OH)
Alⓘ KaoliniteAl2(Si2O5)(OH)4
Alⓘ MuscoviteKAl2(AlSi3O10)(OH)2
Alⓘ RoscoeliteKV23+(AlSi3O10)(OH)2
Alⓘ Muscovite var. SericiteKAl2(AlSi3O10)(OH)2
SiSilicon
Siⓘ K Feldspar var. AdulariaKAlSi3O8
Siⓘ Clinozoisite(CaCa)(AlAlAl)O[Si2O7][SiO4](OH)
Siⓘ KaoliniteAl2(Si2O5)(OH)4
Siⓘ MuscoviteKAl2(AlSi3O10)(OH)2
Siⓘ QuartzSiO2
Siⓘ RoscoeliteKV23+(AlSi3O10)(OH)2
Siⓘ Muscovite var. SericiteKAl2(AlSi3O10)(OH)2
SSulfur
Sⓘ AcanthiteAg2S
Sⓘ BaryteBaSO4
Sⓘ BorniteCu5FeS4
Sⓘ Benleonardite[Ag6(Sb,As)2S6Te][Ag9Cu(S,Te)2Te2]
Sⓘ ChalcopyriteCuFeS2
Sⓘ ColusiteCu13VAs3S16
Sⓘ DigeniteCu9S5
Sⓘ Freibergite Subgroup(Ag6,[Ag6]4+)(Cu4 C22+)Sb4S12S0-1
Sⓘ GalenaPbS
Sⓘ ImiteriteAg2HgS2
Sⓘ LenaiteAgFeS2
Sⓘ MarcasiteFeS2
Sⓘ Nagyágite[Pb3(Pb,Sb)3S6](Au,Te)3
Sⓘ Polybasite[Ag6Sb2S7][Ag9CuS4]
Sⓘ ProustiteAg3AsS3
Sⓘ PyriteFeS2
Sⓘ SphaleriteZnS
Sⓘ Tennantite SubgroupCu6(Cu4C22+)As4S12S
Sⓘ Tetrahedrite SubgroupCu6(Cu4C22+)Sb4S12S
KPotassium
Kⓘ K Feldspar var. AdulariaKAlSi3O8
Kⓘ MuscoviteKAl2(AlSi3O10)(OH)2
Kⓘ RoscoeliteKV23+(AlSi3O10)(OH)2
Kⓘ Muscovite var. SericiteKAl2(AlSi3O10)(OH)2
CaCalcium
Caⓘ AnkeriteCa(Fe2+,Mg)(CO3)2
Caⓘ CalciteCaCO3
Caⓘ Clinozoisite(CaCa)(AlAlAl)O[Si2O7][SiO4](OH)
Caⓘ DolomiteCaMg(CO3)2
Caⓘ FluoriteCaF2
TiTitanium
Tiⓘ RutileTiO2
VVanadium
Vⓘ ColusiteCu13VAs3S16
Vⓘ RoscoeliteKV23+(AlSi3O10)(OH)2
FeIron
Feⓘ AnkeriteCa(Fe2+,Mg)(CO3)2
Feⓘ BorniteCu5FeS4
Feⓘ ChalcopyriteCuFeS2
Feⓘ GoethiteFe3+O(OH)
Feⓘ HematiteFe2O3
Feⓘ LenaiteAgFeS2
Feⓘ MagnetiteFe2+Fe23+O4
Feⓘ MarcasiteFeS2
Feⓘ PyriteFeS2
CuCopper
Cuⓘ BorniteCu5FeS4
Cuⓘ Benleonardite[Ag6(Sb,As)2S6Te][Ag9Cu(S,Te)2Te2]
Cuⓘ ChalcopyriteCuFeS2
Cuⓘ ColusiteCu13VAs3S16
Cuⓘ DigeniteCu9S5
Cuⓘ Freibergite Subgroup(Ag6,[Ag6]4+)(Cu4 C22+)Sb4S12S0-1
Cuⓘ Polybasite[Ag6Sb2S7][Ag9CuS4]
Cuⓘ Tennantite SubgroupCu6(Cu4C22+)As4S12S
Cuⓘ Tetrahedrite SubgroupCu6(Cu4C22+)Sb4S12S
ZnZinc
Znⓘ SphaleriteZnS
AsArsenic
Asⓘ Benleonardite[Ag6(Sb,As)2S6Te][Ag9Cu(S,Te)2Te2]
Asⓘ ColusiteCu13VAs3S16
Asⓘ ProustiteAg3AsS3
Asⓘ Tennantite SubgroupCu6(Cu4C22+)As4S12S
AgSilver
Agⓘ AcanthiteAg2S
Agⓘ Benleonardite[Ag6(Sb,As)2S6Te][Ag9Cu(S,Te)2Te2]
Agⓘ Native Gold var. Electrum(Au,Ag)
Agⓘ Freibergite Subgroup(Ag6,[Ag6]4+)(Cu4 C22+)Sb4S12S0-1
Agⓘ HessiteAg2Te
Agⓘ ImiteriteAg2HgS2
Agⓘ KrenneriteAu3AgTe8
Agⓘ LenaiteAgFeS2
Agⓘ Polybasite[Ag6Sb2S7][Ag9CuS4]
Agⓘ ProustiteAg3AsS3
Agⓘ StütziteAg5-xTe3, x = 0.24-0.36
Agⓘ SylvaniteAgAuTe4
SbAntimony
Sbⓘ Benleonardite[Ag6(Sb,As)2S6Te][Ag9Cu(S,Te)2Te2]
Sbⓘ Freibergite Subgroup(Ag6,[Ag6]4+)(Cu4 C22+)Sb4S12S0-1
Sbⓘ Nagyágite[Pb3(Pb,Sb)3S6](Au,Te)3
Sbⓘ Polybasite[Ag6Sb2S7][Ag9CuS4]
Sbⓘ Tetrahedrite SubgroupCu6(Cu4C22+)Sb4S12S
TeTellurium
Teⓘ AltaitePbTe
Teⓘ Benleonardite[Ag6(Sb,As)2S6Te][Ag9Cu(S,Te)2Te2]
Teⓘ HessiteAg2Te
Teⓘ KrenneriteAu3AgTe8
Teⓘ Nagyágite[Pb3(Pb,Sb)3S6](Au,Te)3
Teⓘ StütziteAg5-xTe3, x = 0.24-0.36
Teⓘ SylvaniteAgAuTe4
Teⓘ Native TelluriumTe
BaBarium
Baⓘ BaryteBaSO4
AuGold
Auⓘ Native Gold var. Electrum(Au,Ag)
Auⓘ Native GoldAu
Auⓘ KrenneriteAu3AgTe8
Auⓘ Nagyágite[Pb3(Pb,Sb)3S6](Au,Te)3
Auⓘ SylvaniteAgAuTe4
HgMercury
Hgⓘ ImiteriteAg2HgS2
PbLead
Pbⓘ AltaitePbTe
Pbⓘ GalenaPbS
Pbⓘ Nagyágite[Pb3(Pb,Sb)3S6](Au,Te)3

Other Databases

Link to USGS MRDS:10196569

Other Regions, Features and Areas containing this locality

North AmericaContinent
North America PlateTectonic Plate

This page contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.

References

Zhang, X., and Spry, P.G. (1991): Mineralogical and fluid inclusion characteristics of the epithermal Gies gold-silver telluride deposit, Judith Mountains, Fergus County, Montana: A preliminary study, in Baker, D.W., and Berg, R.B., eds., Guidebook of the central Montana alkalic belt, Montana Bureau of Mines and Geology Special Publication 100, p. 63-76.
Zhang, Xiaomao, Spry, Paul G. (1994) Petrological, mineralogical, fluid inclusion, and stable isotope studies of the Gies gold-silver telluride deposit, Judith Mountains, Montana. Economic Geology, 89 (3) 602-627 doi:10.2113/gsecongeo.89.3.602
Bindi, L.; Spry, P. G.; Pratesi, G. (2006) Lenaite from the Gies gold–silver telluride deposit, Judith Mountains, Montana, U.S.A.: occurrence, composition, and crystal structure. The Canadian Mineralogist, 44 (1). 207-212 doi:10.2113/gscanmin.44.1.207
[1]Spry, Paul G.; Thieben, Scott E. (2025) Mineralogy, geochemistry and genesis of alkaline igneous rock-related gold-silver telluride deposits of central Montana. Geological Magazine, 162. doi:10.1017/s0016756825100290
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