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Platt Pegmatite Mine, Big Creek pegmatite District, Carbon County, Wyoming, USAi
Regional Level Types
Platt Pegmatite MineMine
Big Creek pegmatite DistrictMining District
Carbon CountyCounty
WyomingState
USACountry

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Latitude & Longitude (WGS84):
41° 6' 55'' North , 106° 30' 16'' West
Latitude & Longitude (decimal):
41.11528,-106.50472
GeoHash:
G#: 9xk3bkv9u
GRN:
N28W58
Type:
Mine
KΓΆppen climate type:
Dfb : Warm-summer humid continental climate
Nearest Settlements:
PlacePopulationDistance
Encampment438 (2017)26.0km
Centennial270 (2011)36.5km
Saratoga1,677 (2017)45.4km
Walden584 (2017)46.5km
Mindat Locality ID:
7153
Long-form identifier:
mindat:1:2:7153:9
GUID (UUID V4):
dfa54498-a7da-4772-911f-c83cd9be6093
Other/historical names associated with this locality:
Uranium King Mine; Platte mine


An Yttrium-enriched pegmatite mined for rare-earth elements by Mr. Ralph Platt in the 1950s. The original ore was considered to be Euxenite-(Y) but new information in 2002 indicates it is Samarskite-(Y). The classification scheme of Cerny and Ercit (2005) has the Platt Pegmatite in the Muscovite-REE, MSREL-REE class.

Platt’s Prospect is a pegmatite that produced 5,000 pounds (2.27 t) of Samarskite-(Y) concentrate in the 1950s. A brief note on the mine is in Harris and King (1987) and more extensively by Harris (2002) and Sutherland and Cola (2016). This is an unusual pegmatite due to the high enrichment in Y oxides. It produces the best Samarskite-(Y) crystals outside Madagascar and some of the few that are both unaltered and terminated. The pegmatite has not been weathered or altered, as all the Samarskite-(Y) samples on the internet have the same thin alteration with a metamict body. There were still plenty of small broken pieces of Samarskite to collect at the shaft dump in 2012 as there are photos in Mindat of collecting there and that there was no one in the vicinity.

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


12 valid minerals.

Rock Types Recorded

Note: data is currently VERY limited. Please bear with us while we work towards adding this information!

Select Rock List Type

Alphabetical List Tree Diagram

Detailed Mineral List:

β“˜ Albite
Formula: Na(AlSi3O8)
Description: Albite (variety cleavelandite) Columbite (excellent single crystals of columbite to 3 inches)
β“˜ Albite var. Cleavelandite
Formula: Na(AlSi3O8)
β“˜ 'Allanite Group'
Formula: (A12+REE3+)(M13+M23+M32+)O[Si2O7][SiO4](OH)
β“˜ 'Biotite'
Formula: K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Description: Albite (variety cleavelandite) Columbite (excellent single crystals of columbite to 3 inches)
β“˜ Cheralite
Formula: CaTh(PO4)2
Description: Reportedly an alteration rind on Samarskite-Y.
β“˜ 'Columbite-(Fe)-Columbite-(Mn) Series'
Description: Albite (variety cleavelandite) Columbite (excellent single crystals of columbite to 3 inches)
β“˜ Epidote
Formula: (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
β“˜ Euxenite-(Y) ?
Formula: (Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6
Description: Samples identified by EDS etc. as Samarskite-(Y) by Rasche and Jacobson (2023.
β“˜ 'Feldspar Group'
β“˜ 'Feldspar Group var. Perthite'
β“˜ Fluorite
Formula: CaF2
Description: Albite (variety cleavelandite) Columbite (excellent single crystals of columbite to 3 inches)
β“˜ 'Garnet Group'
Formula: X3Z2(SiO4)3
β“˜ Hematite
Formula: Fe2O3
β“˜ 'Limonite'
β“˜ Microcline
Formula: K(AlSi3O8)
β“˜ 'Monazite'
Formula: REE(PO4)
Description: Albite (variety cleavelandite) Columbite (excellent single crystals of columbite to 3 inches)
β“˜ Muscovite
Formula: KAl2(AlSi3O10)(OH)2
Description: Albite (variety cleavelandite) Columbite (excellent single crystals of columbite to 3 inches)
β“˜ Pyrolusite
Formula: Mn4+O2
β“˜ Quartz
Formula: SiO2
Description: Albite (variety cleavelandite) Columbite (excellent single crystals of columbite to 3 inches)
β“˜ Samarskite-(Y)
Formula: YFe3+Nb2O8
Description: Originally called Euxinite but Harris (2002) has re-evaluated these crystals and called them Samarskite-(Y) instead of Euxenite-(Y). The samples have been identified by EDS etc. as Samarskite-(Y) by Rasche and Jacobson (2023) The reddish-brown coating on the Samarskite has been identified in Mindat and E-rocks as Cheralite (Ca0.5Th0.5(PO4)).
β“˜ Schorl
Formula: NaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH)
Description: Albite (variety cleavelandite) Columbite (excellent single crystals of columbite to 3 inches)
β“˜ 'Tourmaline'
Formula: AD3G6 (T6O18)(BO3)3X3Z

Gallery:

CaTh(PO4)2β“˜ Cheralite
(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6β“˜ Euxenite-(Y) ?
REE(PO4)β“˜ 'Monazite'

List of minerals arranged by Strunz 10th Edition classification

Group 3 - Halides
β“˜Fluorite3.AB.25CaF2
Group 4 - Oxides and Hydroxides
β“˜Hematite4.CB.05Fe2O3
β“˜Quartz4.DA.05SiO2
β“˜Pyrolusite4.DB.05Mn4+O2
β“˜Samarskite-(Y)4.DB.25YFe3+Nb2O8
β“˜Euxenite-(Y) ?4.DG.05(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6
Group 8 - Phosphates, Arsenates and Vanadates
β“˜Cheralite8.AD.50CaTh(PO4)2
Group 9 - Silicates
β“˜Epidote9.BG.05a(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
β“˜Schorl9.CK.05NaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH)
β“˜Muscovite9.EC.15KAl2(AlSi3O10)(OH)2
β“˜Microcline9.FA.30K(AlSi3O8)
β“˜Albite
var. Cleavelandite		9.FA.35Na(AlSi3O8)
β“˜9.FA.35Na(AlSi3O8)
Unclassified
β“˜'Biotite'-K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
β“˜'Monazite'-REE(PO4)
β“˜'Tourmaline'-AD3G6 (T6O18)(BO3)3X3Z
β“˜'Feldspar Group
var. Perthite'		-
β“˜'Limonite'-
β“˜'Feldspar Group'-
β“˜'Columbite-(Fe)-Columbite-(Mn) Series'-
β“˜'Garnet Group'-X3Z2(SiO4)3
β“˜'Allanite Group'-(A12+REE3+)(M13+M23+M32+)O[Si2O7][SiO4](OH)

List of minerals for each chemical element

HHydrogen
Hβ“˜ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Hβ“˜ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Hβ“˜ MuscoviteKAl2(AlSi3O10)(OH)2
Hβ“˜ SchorlNaFe32+Al6(Si6O18)(BO3)3(OH)3(OH)
Hβ“˜ Allanite Group(A12+REE3+)(M13+M23+M32+)O[Si2O7][SiO4](OH)
BBoron
Bβ“˜ SchorlNaFe32+Al6(Si6O18)(BO3)3(OH)3(OH)
Bβ“˜ TourmalineAD3G6 (T6O18)(BO3)3X3Z
OOxygen
Oβ“˜ AlbiteNa(AlSi3O8)
Oβ“˜ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Oβ“˜ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Oβ“˜ Euxenite-(Y)(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6
Oβ“˜ HematiteFe2O3
Oβ“˜ MicroclineK(AlSi3O8)
Oβ“˜ MonaziteREE(PO4)
Oβ“˜ MuscoviteKAl2(AlSi3O10)(OH)2
Oβ“˜ PyrolusiteMn4+O2
Oβ“˜ QuartzSiO2
Oβ“˜ Samarskite-(Y)YFe3+Nb2O8
Oβ“˜ SchorlNaFe32+Al6(Si6O18)(BO3)3(OH)3(OH)
Oβ“˜ TourmalineAD3G6 (T6O18)(BO3)3X3Z
Oβ“˜ CheraliteCaTh(PO4)2
Oβ“˜ Albite var. CleavelanditeNa(AlSi3O8)
Oβ“˜ Garnet GroupX3Z2(SiO4)3
Oβ“˜ Allanite Group(A12+REE3+)(M13+M23+M32+)O[Si2O7][SiO4](OH)
FFluorine
Fβ“˜ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Fβ“˜ FluoriteCaF2
NaSodium
Naβ“˜ AlbiteNa(AlSi3O8)
Naβ“˜ SchorlNaFe32+Al6(Si6O18)(BO3)3(OH)3(OH)
Naβ“˜ Albite var. CleavelanditeNa(AlSi3O8)
MgMagnesium
Mgβ“˜ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
AlAluminium
Alβ“˜ AlbiteNa(AlSi3O8)
Alβ“˜ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Alβ“˜ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Alβ“˜ MicroclineK(AlSi3O8)
Alβ“˜ MuscoviteKAl2(AlSi3O10)(OH)2
Alβ“˜ SchorlNaFe32+Al6(Si6O18)(BO3)3(OH)3(OH)
Alβ“˜ Albite var. CleavelanditeNa(AlSi3O8)
SiSilicon
Siβ“˜ AlbiteNa(AlSi3O8)
Siβ“˜ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Siβ“˜ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Siβ“˜ MicroclineK(AlSi3O8)
Siβ“˜ MuscoviteKAl2(AlSi3O10)(OH)2
Siβ“˜ QuartzSiO2
Siβ“˜ SchorlNaFe32+Al6(Si6O18)(BO3)3(OH)3(OH)
Siβ“˜ Albite var. CleavelanditeNa(AlSi3O8)
Siβ“˜ Garnet GroupX3Z2(SiO4)3
Siβ“˜ Allanite Group(A12+REE3+)(M13+M23+M32+)O[Si2O7][SiO4](OH)
PPhosphorus
Pβ“˜ MonaziteREE(PO4)
Pβ“˜ CheraliteCaTh(PO4)2
KPotassium
Kβ“˜ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Kβ“˜ MicroclineK(AlSi3O8)
Kβ“˜ MuscoviteKAl2(AlSi3O10)(OH)2
CaCalcium
Caβ“˜ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Caβ“˜ Euxenite-(Y)(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6
Caβ“˜ FluoriteCaF2
Caβ“˜ CheraliteCaTh(PO4)2
TiTitanium
Tiβ“˜ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Tiβ“˜ Euxenite-(Y)(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6
MnManganese
Mnβ“˜ PyrolusiteMn4+O2
FeIron
Feβ“˜ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Feβ“˜ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Feβ“˜ HematiteFe2O3
Feβ“˜ Samarskite-(Y)YFe3+Nb2O8
Feβ“˜ SchorlNaFe32+Al6(Si6O18)(BO3)3(OH)3(OH)
YYttrium
Yβ“˜ Euxenite-(Y)(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6
Yβ“˜ Samarskite-(Y)YFe3+Nb2O8
NbNiobium
Nbβ“˜ Euxenite-(Y)(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6
Nbβ“˜ Samarskite-(Y)YFe3+Nb2O8
CeCerium
Ceβ“˜ Euxenite-(Y)(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6
TaTantalum
Taβ“˜ Euxenite-(Y)(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6
ThThorium
Thβ“˜ Euxenite-(Y)(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6
Thβ“˜ CheraliteCaTh(PO4)2
UUranium
Uβ“˜ Euxenite-(Y)(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6

Other Databases

Link to USGS MRDS:10107762

Other Regions, Features and Areas containing this locality

North America
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

Rocks & Minerals: 58:215; 76:393.
Rasche M. and Jacobson M.E. (2023) Samarskite-(Y) and Associated Minerals, Platt Pegmatite, (Uranium King Claim), Encampment, Carbon County, Wyoming: New Mexico Mineral Symposium, Abstract, p. 34-35
Harris R.E. and King J.K. (1987) Columbium (Niobium) and Tantalum in Wyoming: Geological Survey of Wyoming, OFR 87-6, 19 p.
R. S. Houston (1961) The Big Creek Pegmatite Area, Carbon County, Wyoming. Wyoming Geological Survey Preliminary Report 1.
Harris R.E. (2002) Rare Earth Elements and Yttrium in Wyoming: Wyoming State Geological Survey, Industrial Mineral Report 91-3 (revised 2002) 124 p.
Cerny, P., Ercit, T. S. (2005) The Classification of Granitic Pegmatites Revisited. The Canadian Mineralogist, 43 (6) 2005-2026 doi:10.2113/gscanmin.43.6.2005
Sutherland W.M. and Cola E.C. (2016) A Comprehensive Report on Rare Earth Elements in Wyoming: Wyoming State Geological Survey, Report of Investigations, no. 71, 137 p.
www.mindat.org (n.d.) https://www.mindat.org/article.php/4609/Richard+Gunter+Catalogue+Samarskite
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