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Bear Lodge District, Crook Co., Wyoming, USAi
Regional Level Types
Bear Lodge DistrictMining District
Crook Co.County
WyomingState
USACountry

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Location is approximate, estimate based on other nearby localities.
 
Latitude & Longitude (WGS84): 44° North , 104° West (est.)
Margin of Error:~62km
Locality type:Mining District
Köppen climate type:BSk : Cold semi-arid (steppe) climate


10 miles N of Sundance (T. 51-52 N., R. 63 W.), includes Petersen deposits (secs. 15 & 22, T. 52 N., R. 63 W.), Hutchinson prospect, and Royal Purple Nos. 1 & 2 claims (sec. 30, T. 52 N., R. 63 W. & sec. 25, T. 52 N., R. 64 W.); siliceous fluorite veins and limestone replacement associated with andesite sills intruded into limestone.
The REE-thorium deposits and nearby gold mineralization of the southern Bear Lodge Mountains are hosted by middle Tertiary alkaline intrusions. These intrusions are Eocene (38.3−50 million years old) and consist primarily of phonolite and trachyte (Staatz, 1983). They intruded Paleozoic and Mesozoic sedimentary rocks, forming a dome about 13 km (8 mi) long by 10 km (6 mi) wide. Breccia bodies are associated with the igneous intrusions, such as a heterolithic diatreme breccia near Bull Hill. Rare earth elements–bearing carbonatite dikes intruded near the Bull Hill diatreme; the dikes are surrounded by a large zone of low-grade REE mineralization that fills thin, narrow stockwork fractures within the large alkaline intrusions. These thorium and REE deposits crop out throughout an area of about 16 km2 (6 mi2) (Staatz, 1983). The igneous core of the dome is microfractured and altered, thereby forming disseminated deposits. The REE and thorium mineralization precipitated within thin fractures as coatings and veinlets as much as 6 mm thick. The coatings and veinlets consist predominantly of iron and manganese oxide minerals, along with potassium feldspar and quartz. The REE and thorium are incorporated into the minerals monazite, thorite, and brockite.

Regions containing this locality

North America PlateTectonic Plate

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Standard Detailed Strunz Dana Chemical Elements

Commodity List

This is a list of exploitable or exploited mineral commodities recorded from this region.


Mineral List

Mineral list contains entries from the region specified including sub-localities

18 valid minerals.

Rock Types Recorded

Note: this is a very new system on mindat.org and data is currently VERY limited. Please bear with us while we work towards adding this information!

Rock list contains entries from the region specified including sub-localities

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Alphabetical List Tree Diagram

Detailed Mineral List:

'Ancylite'
Reference: Andersen, A. K., Clark, J. G., Larson, P. B., & Donovan, J. J. (2017). REE fractionation, mineral speciation, and supergene enrichment of the Bear Lodge carbonatites, Wyoming, USA. Ore Geology Reviews, 89, 780-807.
'Apatite'
Reference: Andersen, A. K., Clark, J. G., Larson, P. B., & Donovan, J. J. (2017). REE fractionation, mineral speciation, and supergene enrichment of the Bear Lodge carbonatites, Wyoming, USA. Ore Geology Reviews, 89, 780-807.
Baryte
Formula: BaSO4
Reference: Rocks & Minerals 76:385; Andersen, A. K., Clark, J. G., Larson, P. B., & Donovan, J. J. (2017). REE fractionation, mineral speciation, and supergene enrichment of the Bear Lodge carbonatites, Wyoming, USA. Ore Geology Reviews, 89, 780-807.
'Bastnäsite'
Reference: Andersen, A. K., Clark, J. G., Larson, P. B., & Donovan, J. J. (2017). REE fractionation, mineral speciation, and supergene enrichment of the Bear Lodge carbonatites, Wyoming, USA. Ore Geology Reviews, 89, 780-807.
Brockite
Formula: (Ca,Th,Ce)PO4 · H2O
Reference: USGS Open File report 2010-5220
Burbankite
Formula: (Na,Ca)3(Sr,Ba,Ce)3(CO3)5
Reference: Andersen, A. K., Clark, J. G., Larson, P. B., & Donovan, J. J. (2017). REE fractionation, mineral speciation, and supergene enrichment of the Bear Lodge carbonatites, Wyoming, USA. Ore Geology Reviews, 89, 780-807.
Calcite
Formula: CaCO3
Reference: Rocks & Minerals 76:385; Andersen, A. K., Clark, J. G., Larson, P. B., & Donovan, J. J. (2017). REE fractionation, mineral speciation, and supergene enrichment of the Bear Lodge carbonatites, Wyoming, USA. Ore Geology Reviews, 89, 780-807.
Carbocernaite
Formula: (Ca,Na)(Sr,Ce,Ba)(CO3)2
Reference: Andersen, A. K., Clark, J. G., Larson, P. B., & Donovan, J. J. (2017). REE fractionation, mineral speciation, and supergene enrichment of the Bear Lodge carbonatites, Wyoming, USA. Ore Geology Reviews, 89, 780-807.
Cerianite-(Ce)
Formula: (Ce4+,Th)O2
Reference: Andersen, A. K., Clark, J. G., Larson, P. B., & Donovan, J. J. (2017). REE fractionation, mineral speciation, and supergene enrichment of the Bear Lodge carbonatites, Wyoming, USA. Ore Geology Reviews, 89, 780-807.
Fluorapatite
Formula: Ca5(PO4)3F
Reference: Andersen, A. K., Clark, J. G., Larson, P. B., & Donovan, J. J. (2017). REE fractionation, mineral speciation, and supergene enrichment of the Bear Lodge carbonatites, Wyoming, USA. Ore Geology Reviews, 89, 780-807.
Fluorite
Formula: CaF2
Reference: Rocks & Minerals 76:385
Gold
Formula: Au
Reference: U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
Hematite
Formula: Fe2O3
Reference: USGS Open File report 2010-5220
Jarosite
Formula: KFe3+ 3(SO4)2(OH)6
Reference: Andersen, A. K., Clark, J. G., Larson, P. B., & Donovan, J. J. (2017). REE fractionation, mineral speciation, and supergene enrichment of the Bear Lodge carbonatites, Wyoming, USA. Ore Geology Reviews, 89, 780-807.
'K Feldspar'
Reference: USGS Open File report 2010-5220
'Limonite'
Formula: (Fe,O,OH,H2O)
'Monazite'
Reference: USGS Open File report 2010-5220; Andersen, A. K., Clark, J. G., Larson, P. B., & Donovan, J. J. (2017). REE fractionation, mineral speciation, and supergene enrichment of the Bear Lodge carbonatites, Wyoming, USA. Ore Geology Reviews, 89, 780-807.
'Parisite'
Reference: Andersen, A. K., Clark, J. G., Larson, P. B., & Donovan, J. J. (2017). REE fractionation, mineral speciation, and supergene enrichment of the Bear Lodge carbonatites, Wyoming, USA. Ore Geology Reviews, 89, 780-807.
Pseudorutile
Formula: Fe2Ti3O9
Reference: Andersen, A. K., Clark, J. G., Larson, P. B., & Donovan, J. J. (2017). REE fractionation, mineral speciation, and supergene enrichment of the Bear Lodge carbonatites, Wyoming, USA. Ore Geology Reviews, 89, 780-807.
'Psilomelane'
Reference: U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
Pyrite
Formula: FeS2
Reference: U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
Pyrolusite
Formula: Mn4+O2
Reference: U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
Quartz
Formula: SiO2
Reference: USGS Open File report 2010-5220
'Rhabdophane'
Reference: Andersen, A. K., Clark, J. G., Larson, P. B., & Donovan, J. J. (2017). REE fractionation, mineral speciation, and supergene enrichment of the Bear Lodge carbonatites, Wyoming, USA. Ore Geology Reviews, 89, 780-807.
Rutile
Formula: TiO2
Reference: Andersen, A. K., Clark, J. G., Larson, P. B., & Donovan, J. J. (2017). REE fractionation, mineral speciation, and supergene enrichment of the Bear Lodge carbonatites, Wyoming, USA. Ore Geology Reviews, 89, 780-807.
Siderite
Formula: FeCO3
Reference: Rocks & Minerals 76:385
'Synchysite'
Reference: Andersen, A. K., Clark, J. G., Larson, P. B., & Donovan, J. J. (2017). REE fractionation, mineral speciation, and supergene enrichment of the Bear Lodge carbonatites, Wyoming, USA. Ore Geology Reviews, 89, 780-807.
Thorite
Formula: Th(SiO4)
Reference: USGS Open File report 2010-5220
'Wad'
Reference: USGS Open File report 2010-5220

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
Gold1.AA.05Au
Group 2 - Sulphides and Sulfosalts
Pyrite2.EB.05aFeS2
Group 3 - Halides
Fluorite3.AB.25CaF2
Group 4 - Oxides and Hydroxides
Cerianite-(Ce)4.DL.05(Ce4+,Th)O2
Hematite4.CB.05Fe2O3
Pseudorutile4.CB.25Fe2Ti3O9
Pyrolusite4.DB.05Mn4+O2
Quartz4.DA.05SiO2
Rutile4.DB.05TiO2
Group 5 - Nitrates and Carbonates
Burbankite5.AC.30(Na,Ca)3(Sr,Ba,Ce)3(CO3)5
Calcite5.AB.05CaCO3
Carbocernaite5.AB.50(Ca,Na)(Sr,Ce,Ba)(CO3)2
Siderite5.AB.05FeCO3
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
Baryte7.AD.35BaSO4
Jarosite7.BC.10KFe3+ 3(SO4)2(OH)6
Group 8 - Phosphates, Arsenates and Vanadates
Brockite8.CJ.45(Ca,Th,Ce)PO4 · H2O
Fluorapatite8.BN.05Ca5(PO4)3F
Group 9 - Silicates
Thorite9.AD.30Th(SiO4)
Unclassified Minerals, Rocks, etc.
'Ancylite'-
'Apatite'-
'Bastnäsite'-
'K Feldspar'-
'Limonite'-(Fe,O,OH,H2O)
'Monazite'-
'Parisite'-
'Psilomelane'-
'Rhabdophane'-
'Synchysite'-
'Wad'-

List of minerals arranged by Dana 8th Edition classification

Group 1 - NATIVE ELEMENTS AND ALLOYS
Metals, other than the Platinum Group
Gold1.1.1.1Au
Group 2 - SULFIDES
AmBnXp, with (m+n):p = 1:2
Pyrite2.12.1.1FeS2
Group 4 - SIMPLE OXIDES
A2X3
Hematite4.3.1.2Fe2O3
AX2
Cerianite-(Ce)4.4.12.1(Ce4+,Th)O2
Pyrolusite4.4.1.4Mn4+O2
Rutile4.4.1.1TiO2
Group 8 - MULTIPLE OXIDES CONTAINING NIOBIUM,TANTALUM OR TITANIUM
A2B3O9
Pseudorutile8.4.2.1Fe2Ti3O9
Group 9 - NORMAL HALIDES
AX2
Fluorite9.2.1.1CaF2
Group 14 - ANHYDROUS NORMAL CARBONATES
A(XO3)
Calcite14.1.1.1CaCO3
Siderite14.1.1.3FeCO3
Miscellaneous
Burbankite14.4.4.1(Na,Ca)3(Sr,Ba,Ce)3(CO3)5
Carbocernaite14.4.6.1(Ca,Na)(Sr,Ce,Ba)(CO3)2
Group 28 - ANHYDROUS ACID AND NORMAL SULFATES
AXO4
Baryte28.3.1.1BaSO4
Group 30 - ANHYDROUS SULFATES CONTAINING HYDROXYL OR HALOGEN
(AB)2(XO4)Zq
Jarosite30.2.5.1KFe3+ 3(SO4)2(OH)6
Group 40 - HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
(AB)5(XO4)2·xH2O
Brockite40.4.7.5(Ca,Th,Ce)PO4 · H2O
Group 41 - ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
A5(XO4)3Zq
Fluorapatite41.8.1.1Ca5(PO4)3F
Group 51 - NESOSILICATES Insular SiO4 Groups Only
Insular SiO4 Groups Only with cations in >[6] coordination
Thorite51.5.2.3Th(SiO4)
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Unclassified Minerals, Mixtures, etc.
'Ancylite'-
'Apatite'-
'Bastnäsite'-
'K Feldspar'-
'Limonite'-(Fe,O,OH,H2O)
'Monazite'-
'Parisite'-
'Psilomelane'-
'Rhabdophane'-
'Synchysite'-
'Wad'-

List of minerals for each chemical element

HHydrogen
H Limonite(Fe,O,OH,H2O)
H Brockite(Ca,Th,Ce)PO4 · H2O
H JarositeKFe3+ 3(SO4)2(OH)6
CCarbon
C CalciteCaCO3
C SideriteFeCO3
C Carbocernaite(Ca,Na)(Sr,Ce,Ba)(CO3)2
C Burbankite(Na,Ca)3(Sr,Ba,Ce)3(CO3)5
OOxygen
O BaryteBaSO4
O CalciteCaCO3
O QuartzSiO2
O SideriteFeCO3
O Limonite(Fe,O,OH,H2O)
O PyrolusiteMn4+O2
O ThoriteTh(SiO4)
O HematiteFe2O3
O Brockite(Ca,Th,Ce)PO4 · H2O
O RutileTiO2
O PseudorutileFe2Ti3O9
O JarositeKFe3+ 3(SO4)2(OH)6
O FluorapatiteCa5(PO4)3F
O Cerianite-(Ce)(Ce4+,Th)O2
O Carbocernaite(Ca,Na)(Sr,Ce,Ba)(CO3)2
O Burbankite(Na,Ca)3(Sr,Ba,Ce)3(CO3)5
FFluorine
F FluoriteCaF2
F FluorapatiteCa5(PO4)3F
NaSodium
Na Carbocernaite(Ca,Na)(Sr,Ce,Ba)(CO3)2
Na Burbankite(Na,Ca)3(Sr,Ba,Ce)3(CO3)5
SiSilicon
Si QuartzSiO2
Si ThoriteTh(SiO4)
PPhosphorus
P Brockite(Ca,Th,Ce)PO4 · H2O
P FluorapatiteCa5(PO4)3F
SSulfur
S BaryteBaSO4
S PyriteFeS2
S JarositeKFe3+ 3(SO4)2(OH)6
KPotassium
K JarositeKFe3+ 3(SO4)2(OH)6
CaCalcium
Ca CalciteCaCO3
Ca FluoriteCaF2
Ca Brockite(Ca,Th,Ce)PO4 · H2O
Ca FluorapatiteCa5(PO4)3F
Ca Carbocernaite(Ca,Na)(Sr,Ce,Ba)(CO3)2
Ca Burbankite(Na,Ca)3(Sr,Ba,Ce)3(CO3)5
TiTitanium
Ti RutileTiO2
Ti PseudorutileFe2Ti3O9
MnManganese
Mn PyrolusiteMn4+O2
FeIron
Fe SideriteFeCO3
Fe Limonite(Fe,O,OH,H2O)
Fe PyriteFeS2
Fe HematiteFe2O3
Fe PseudorutileFe2Ti3O9
Fe JarositeKFe3+ 3(SO4)2(OH)6
SrStrontium
Sr Carbocernaite(Ca,Na)(Sr,Ce,Ba)(CO3)2
Sr Burbankite(Na,Ca)3(Sr,Ba,Ce)3(CO3)5
BaBarium
Ba BaryteBaSO4
Ba Burbankite(Na,Ca)3(Sr,Ba,Ce)3(CO3)5
LaLanthanum
La Carbocernaite(Ca,Na)(Sr,Ce,Ba)(CO3)2
CeCerium
Ce Brockite(Ca,Th,Ce)PO4 · H2O
Ce Cerianite-(Ce)(Ce4+,Th)O2
Ce Carbocernaite(Ca,Na)(Sr,Ce,Ba)(CO3)2
Ce Burbankite(Na,Ca)3(Sr,Ba,Ce)3(CO3)5
AuGold
Au GoldAu
ThThorium
Th ThoriteTh(SiO4)
Th Brockite(Ca,Th,Ce)PO4 · H2O
Th Cerianite-(Ce)(Ce4+,Th)O2

References

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Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Andersen, A. K., Clark, J. G., Larson, P. B., & Donovan, J. J. (2017). REE fractionation, mineral speciation, and supergene enrichment of the Bear Lodge carbonatites, Wyoming, USA. Ore Geology Reviews, 89, 780-807.
Rocks & Minerals 76:385
USGS Open File report 2010-5220

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