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:
Bayan Obo Deposit (Bayun-Obo Deposit; Baiyunebo Deposit), Bayan Obo, Bayan Obo Mining District, Baotou League (Baotou Prefecture), Inner Mongolia, China

Oldest recorded age at locality: 2070
Youngest recorded age at locality: 427.7

mindat Locality ID: 720
mindat URL: http://www.mindat.org/loc-720.html

Tectonic Settings:

Total number of sublocalities beneath "Bayan Obo Deposit (Bayun-Obo Deposit; Baiyunebo Deposit), Bayan Obo, Bayan Obo Mining District, Baotou League (Baotou Prefecture), Inner Mongolia, China": 3
Total number of bottom-level sublocalities: 3

Number of Child Localities: 3
Child Localities:
East Mine
Main Pit
West Mine

Latitude: 41°47'58"N
Longitude: 109°56'22"E
Decimal Degree (lat, lon): 41.799444444444,109.93944444444
AThis mineral is Anthropogenic.
GThis mineral is directly dated.
BThis mineral is reported as having this age.
YThis mineral is using an age reported as an element mineralization period.
OThis mineral is using an age calculated from all data at the locality.
RThe age displayed for this mineral originates from a different, non-child locality.
PThe 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.

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: Al B Ba Be C Ca Ce Cl Cr Cu F Fe H K La Li Ln Mg Mn Mo Na Nb Nd O P Pb S Si Sn Sr Ta Th Ti W Y Zn Zr 

Elements from minerals reported directly at this locality: Al B Ba Be C Ca Ce Cl Cr Cu F Fe H K La Li Mg Mn Mo Na Nb O P Pb S Si Sn Sr Th Ti W Y Zn 

Structural Groups for minerals in this locality: 
AeschyniteAllaniteAlstoniteAluniteAmorphousAmphiboleAndalusiteApatiteAragoniteBaotite
BaryteBastnäsiteCalciteCarbocernaiteChalcopyriteChevkiniteClayClinozoisiteColumbiteCordylite
CorundumDiasporeEpidoteFeldsparFluoriteGarnetGypsumHumiteLanthaniteMatlockite
MelanteriteMicaMolybdeniteMonaziteNickelineNoneNot in a structural groupOlivineParalstoniteParisite
PerovskitePyritePyroxeneQuartzRhabdophaneRocksaltRutileScheeliteSepioliteSmectite-vermiculite
SphaleriteSpinelTitaniteTourmalineVesuvianiteZircon

125 IMA Minerals at location:
Actinolite  (*)Aegirine  (*)Aegirine-augite  (*)Aeschynite-(Ce)  (*)Aeschynite-(Nd)  (*)
Albite  (*)Allanite-(Ce)  (*)Alstonite  (*)Alunite  (*)Anatase  (*)
Andalusite  (*)Andradite  (*)Ankerite  (*)Anorthite  (*)Aragonite  (*)
Arfvedsonite  (*)Augite  (*)Bafertisite  (*)Baotite  (*)Baryte  (*)
Barytocalcite  (*)Bastnäsite-(Ce)  (*)Bastnäsite-(Y)  (*)Benstonite  (*)Britholite-(Ce)  (*)
Brockite  (*)Calcite  (*)Carbocernaite  (*)Cassiterite  (*)Cebaite-(Ce)  (*)
Cerianite-(Ce)  (*)Chalcopyrite  (*)Chevkinite-(Ce)  (*)Chrysoberyl  (*)Fergusonite-(Ce)-β  (*)
Fergusonite-(Nd)-β  (*)Clinohumite  (*)Clinozoisite  (*)Columbite-(Fe)  (*)Columbite-(Mn)  (*)
Cordylite-(Ce)  (*)Cummingtonite  (*)Daqingshanite-(Ce)  (*)Dingdaohengite-(Ce)  (*)Diopside  (*)
Dolomite  (*)Dravite  (*)Epidote  (*)Fayalite  (*)Fergusonite-(Ce)  (*)
Fergusonite-(Y)  (*)Ferrisepiolite  (*)Ferro-edenite  (*)Fersmite  (*)Fluorapatite  (*)
Fluorbritholite-(Ce)  (*)Fluorcalciopyrochlore  (*)Fluorite  (*)Fluorokinoshitalite  (*)Fluorophlogopite  (*)
Fluorotetraferriphlogopite  (*)Galena  (*)Goethite  (*)Graphite  (*)Gypsum  (*)
Halite  (*)Hematite  (*)Huanghoite-(Ce)  (*)Humite  (*)Ilmenite  (*)
Jarosite  (*)Lanthanite-(Ce)  (*)Loparite-(Ce)  (*)Magbasite  (*)Maghemite  (*)
Magnesio-arfvedsonite  (*)Magnesio-riebeckite  (*)Magnesiochromite  (*)Magnesioferrite  (*)Magnetite  (*)
Manganite  (*)Melanterite  (*)Microcline  (*)Molybdenite  (*)Monazite-(Ce)  (*)
Montmorillonite  (*)Muscovite  (*)Nioboaeschynite-(Ce)  (*)Nontronite  (*)Norbergite  (*)
Norsethite  (*)Opal  (*)Orthoclase  (*)Paralstonite  (*)Parisite-(Ce)  (*)
Perovskite  (*)Perrierite-(Ce)  (*)Phlogopite  (*)Pyrite  (*)Pyrolusite  (*)
Pyrrhotite  (*)Quartz  (*)Rhabdophane-(Ce)  (*)Richterite  (*)Riebeckite  (*)
Röntgenite-(Ce)  (*)Rutile  (*)Schorl  (*)Siderite  (*)Sphalerite  (*)
Spinel  (*)Strontianite  (*)Sylvite  (*)Synchysite-(Ce)  (*)Tainiolite  (*)
Thorianite  (*)Thorite  (*)Titanite  (*)Tremolite  (*)Vesuvianite  (*)
Wulfenite  (*)Xenotime-(Y)  (*)Yangzhumingite  (*)Zhangpeishanite  (*)Zircon  (*)
Mineral nameStructural GroupsIMA FormulaMax Age (Ma)Min Age (Ma)# of Sublocalities containing mineralLOCALITY IDs, not mindat ids# of localities containing mineral
Actinolite  (*)Amphibole   Ca2(Mg4.5-2.5Fe2+0.5-2.5)Si8O22(OH)220705441406863419
Aegirine  (*)PyroxeneNaFe3+Si2O62070541240686,406871022
Aegirine-augite  (*)Pyroxene(Ca,Na)(Fe3+,Mg,Fe2+)Si2O62070427.70286
Aeschynite-(Ce)  (*)Aeschynite(Ce,Ca,Fe,Th)(Ti,Nb)2(O,OH)6566544043
Aeschynite-(Nd)  (*)Aeschynite(Nd,Ln,Ca)(Ti,Nb)2(O,OH)65665441406867
Albite  (*)FeldsparNa(AlSi3O8)2070544240686,406888803
Allanite-(Ce)  (*)Allanite EpidoteCaCe(Al2Fe2+)[Si2O7][SiO4]O(OH)566544140686706
Alstonite  (*)AlstoniteBaCa(CO3)22070427.7024
Alunite  (*)NoneKAl3(SO4)2(OH)62070427.70966
Anatase  (*)Not in a structural groupTiO22070427.702162
Andalusite  (*)AndalusiteAl2SiO52070427.701310
Andradite  (*)GarnetCa3Fe3+2(SiO4)32070427.701534
Ankerite  (*)NoneCa(Fe2+,Mg)(CO3)220705441406883092
Anorthite  (*)FeldsparCa(Al2Si2O8)2070427.701036
Aragonite  (*)AragoniteCa(CO3)2070427.703250
Arfvedsonite  (*)AmphiboleNaNa2(Fe2+4Fe3+)Si8O22(OH)22070427.70295
Augite  (*)Pyroxene(Ca,Mg,Fe)2Si2O62070427.702060
Bafertisite  (*)NoneBa2Fe2+4Ti2(Si2O7)2O2(OH)2F2207054414068616
Baotite  (*)BaotiteBa4(Ti,Nb,W)8O16(SiO3)4Cl2070427.7027
Baryte  (*)BaryteBa(SO4)2070541340686,40687,4068811547
Barytocalcite  (*)NoneBaCa(CO3)22070427.7083
Bastnäsite-(Ce)  (*)BastnäsiteCe(CO3)F1600541240686,40687304
Bastnäsite-(Y)  (*)BastnäsiteY(CO3)F566544010
Benstonite  (*)NoneBa6Ca6Mg(CO3)13207054414068817
Britholite-(Ce)  (*)Apatite(Ce,Ca)5(SiO4)3(OH)5665440115
Brockite  (*)Rhabdophane(Ca,Th,Ce)(PO4)·H2O566544048
Calcite  (*)CalciteCa(CO3)2070541340686,40687,4068827770
Carbocernaite  (*)Carbocernaite(Sr,Ce,La)(Ca,Na)(CO3)256654414068824
Cassiterite  (*)RutileSnO22070427.705171
Cebaite-(Ce)  (*)NoneBa3Ce2(CO3)5F2566544240686,406888
Cerianite-(Ce)  (*)FluoriteCeO256654414068894
Chalcopyrite  (*)ChalcopyriteCuFeS22070427.7027198
Chevkinite-(Ce)  (*)ChevkiniteCe4(Ti,Fe2+,Fe3+)5O8(Si2O7)2566544089
Chrysoberyl  (*)OlivineBeAl2O42070427.70321
Fergusonite-(Ce)-β  (*)NoneCeNbO45665441406863
Fergusonite-(Nd)-β  (*)NoneNdNbO45665441406881
Clinohumite  (*)HumiteMg9(SiO4)4F22070427.70236
Clinozoisite  (*)Clinozoisite EpidoteCa2Al3[Si2O7][SiO4]O(OH)2070427.701025
Columbite-(Fe)  (*)ColumbiteFe2+Nb2O62070427.70518
Columbite-(Mn)  (*)ColumbiteMn2+Nb2O62070427.70289
Cordylite-(Ce)  (*)Cordylite(Na,Ca,   )BaCe2(CO3)4(F,O)56654414068615
Cummingtonite  (*)Amphibole   Mg2Mg5Si8O22(OH)22070427.70327
Daqingshanite-(Ce)  (*)NoneSr3Ce(PO4)(CO3)356654409
Dingdaohengite-(Ce)  (*)Chevkinite(Ce,La)4Fe2+(Ti,Fe2+,Mg,Fe3+)2Ti2Si4O2256654403
Diopside  (*)PyroxeneCaMgSi2O62070541240686,406874135
Dolomite  (*)NoneCaMg(CO3)22070541340686,40687,406889895
Dravite  (*)TourmalineNaMg3Al6(Si6O18)(BO3)3(OH)3(OH)2070427.70648
Epidote  (*)Epidote ClinozoisiteCa2(Al2Fe3+)[Si2O7][SiO4]O(OH)2070427.708173
Fayalite  (*)OlivineFe2+2(SiO4)2070427.70371
Fergusonite-(Ce)  (*)ScheeliteCeNbO4·0.3H2O56654414068616
Fergusonite-(Y)  (*)ScheeliteYNbO45665440196
Ferrisepiolite  (*)Sepiolite(Fe3+,Fe2+,Mg)4[(Si,Fe3+)6O15](O,OH)2·6H2O2070427.705
Ferro-edenite  (*)AmphiboleNaCa2Fe2+5(Si7Al)O22(OH)2207054414068657
Fersmite  (*)ColumbiteCaNb2O61600541240686,4068783
Fluorapatite  (*)ApatiteCa5(PO4)3F20705441406862740
Fluorbritholite-(Ce)  (*)Apatite(Ce,Ca)5(SiO4)3F56654414068619
Fluorcalciopyrochlore  (*)None(Ca,Na)2(Nb,Ti)2O6F2070427.7018
Fluorite  (*)FluoriteCaF22070541340686,40687,406889617
Fluorokinoshitalite  (*)MicaBaMg3Al2Si2O10F220705441406862
Fluorophlogopite  (*)MicaKMg3(Si3Al)O10F22070427.7047
Fluorotetraferriphlogopite  (*)MicaKMg3Fe3+Si3O10F220705441406863
Galena  (*)RocksaltPbS207054414068624243
Goethite  (*)DiasporeFeO(OH)20705441406867437
Graphite  (*)NoneC2070427.702812
Gypsum  (*)GypsumCa(SO4)·2H2O2070427.706890
Halite  (*)RocksaltNaCl2070427.701398
Hematite  (*)CorundumFe2O32070541340686,40687,4068814640
Huanghoite-(Ce)  (*)NoneBaCe(CO3)2F1600541240686,406879
Humite  (*)HumiteMg7(SiO4)3F2207054414068680
Ilmenite  (*)CorundumFe2+Ti4+O32070427.705433
Jarosite  (*)AluniteKFe3+3(SO4)2(OH)62070427.702228
Lanthanite-(Ce)  (*)LanthaniteCe2(CO3)3·8H2O566544016
Loparite-(Ce)  (*)Perovskite(Na,Ce,Sr)(Ce,Th)(Ti,Nb)2O656654414068857
Magbasite  (*)NoneKBaFe3+Mg7Si8O22(OH)2F62070427.702
Maghemite  (*)Spinel(Fe3+0.67   0.33)Fe3+2O42070427.70229
Magnesio-arfvedsonite  (*)AmphiboleNaNa2(Mg4Fe3+)Si8O22(OH)22070427.7079
Magnesio-riebeckite  (*)Amphibole   Na2(Mg3Fe3+2)Si8O22(OH)2207054414068693
Magnesiochromite  (*)SpinelMgCr2O42070427.70311
Magnesioferrite  (*)SpinelMgFe3+2O4207054414068698
Magnetite  (*)SpinelFe2+Fe3+2O42070541340686,40687,4068814899
Manganite  (*)RutileMn3+O(OH)2070427.70770
Melanterite  (*)MelanteriteFe(SO4)·7H2O2070427.70915
Microcline  (*)FeldsparK(AlSi3O8)2070427.704924
Molybdenite  (*)MolybdeniteMoS22070427.705800
Monazite-(Ce)  (*)MonaziteCe(PO4)1600541240686,40687945
Montmorillonite  (*)Clay Smectite-vermiculite(Na,Ca)0.3(Al,Mg)2Si4O10(OH)2·nH2O2070427.701508
Muscovite  (*)Mica ClayKAl2(Si3Al)O10(OH)22070427.7017380
Nioboaeschynite-(Ce)  (*)Aeschynite(Ce,Ca)(Nb,Ti)2(O,OH)6566544017
Nontronite  (*)Clay Smectite-vermiculiteNa0.3Fe3+2(Si,Al)4O10(OH)2·nH2O2070427.70471
Norbergite  (*)HumiteMg3(SiO4)F2207054414068637
Norsethite  (*)NoneBaMg(CO3)22070544240686,4068830
Opal  (*)AmorphousSiO2·nH2O2070427.702994
Orthoclase  (*)FeldsparK(AlSi3O8)2070427.702349
Paralstonite  (*)ParalstoniteBaCa(CO3)22070427.707
Parisite-(Ce)  (*)ParisiteCaCe2(CO3)3F21600541240686,40687112
Perovskite  (*)PerovskiteCaTiO32070544140688495
Perrierite-(Ce)  (*)ChevkiniteCe4MgFe3+2Ti2O8(Si2O7)256654414068646
Phlogopite  (*)Mica ClayKMg3(AlSi3O10)(OH)22070541340686,40687,406882273
Pyrite  (*)PyriteFeS22070544240686,4068839462
Pyrolusite  (*)RutileMnO22070427.703106
Pyrrhotite  (*)NickelineFe7S82070544240686,406889056
Quartz  (*)QuartzSiO22070544240686,4068861156
Rhabdophane-(Ce)  (*)RhabdophaneCe(PO4)·H2O566544066
Richterite  (*)AmphiboleNa(NaCa)Mg5Si8O22(OH)22070544140686148
Riebeckite  (*)Amphibole   Na2(Fe2+3Fe3+2)Si8O22(OH)22070541340686,40687,40688375
Röntgenite-(Ce)  (*)NoneCa2Ce3(CO3)5F356654414068615
Rutile  (*)RutileTiO22070427.705614
Schorl  (*)TourmalineNaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH)2070427.702705
Siderite  (*)CalciteFe(CO3)2070427.706417
Sphalerite  (*)SphaleriteZnS2070427.7021482
Spinel  (*)SpinelMgAl2O42070427.701934
Strontianite  (*)AragoniteSr(CO3)2070544140688589
Sylvite  (*)RocksaltKCl2070427.70275
Synchysite-(Ce)  (*)NoneCaCe(CO3)2F5665440232
Tainiolite  (*)MicaKLiMg2Si4O10F22070427.7040
Thorianite  (*)FluoriteThO22070544140686236
Thorite  (*)ZirconTh(SiO4)20705441406881006
Titanite  (*)TitaniteCaTi(SiO4)O2070427.704899
Tremolite  (*)Amphibole   Ca2(Mg5.0-4.5Fe2+0.0-0.5)Si8O22(OH)220705441406862562
Vesuvianite  (*)Vesuvianite(Ca,Na)19(Al,Mg,Fe)13(SiO4)10(Si2O7)4(OH,F,O)102070427.701395
Wulfenite  (*)ScheelitePbMoO42070427.701655
Xenotime-(Y)  (*)ZirconY(PO4)5665440939
Yangzhumingite  (*)MicaKMg2.5Si4O10F220705441406864
Zhangpeishanite  (*)MatlockiteBaFCl20705441406862
Zircon  (*)ZirconZr(SiO4)207020701406865251


Locality Notes from all Ages at Locality:
Age IDLocality Notes
Jen_0001114MAGMATIC STYLE: Dykes and possible dolomitized carbonatite tuff. ASSOCIATED SILICATE ROCKS: There are extensive peralkaline granites but their relationship, if any, to the carbonatites is not clear. Basic dykes and brecciated peridotite also occur.
Jen_0001115MAGMATIC STYLE: Dykes and possible dolomitized carbonatite tuff. ASSOCIATED SILICATE ROCKS: There are extensive peralkaline granites but their relationship, if any, to the carbonatites is not clear. Basic dykes and brecciated peridotite also occur.
Jen_0001116MAGMATIC STYLE: Dykes and possible dolomitized carbonatite tuff. ASSOCIATED SILICATE ROCKS: There are extensive peralkaline granites but their relationship, if any, to the carbonatites is not clear. Basic dykes and brecciated peridotite also occur.
Jen_0001117MAGMATIC STYLE: Dykes and possible dolomitized carbonatite tuff. ASSOCIATED SILICATE ROCKS: There are extensive peralkaline granites but their relationship, if any, to the carbonatites is not clear. Basic dykes and brecciated peridotite also occur.
Jen_0001118MAGMATIC STYLE: Dykes and possible dolomitized carbonatite tuff. ASSOCIATED SILICATE ROCKS: There are extensive peralkaline granites but their relationship, if any, to the carbonatites is not clear. Basic dykes and brecciated peridotite also occur.
Jen_0001119MAGMATIC STYLE: Dykes and possible dolomitized carbonatite tuff. ASSOCIATED SILICATE ROCKS: There are extensive peralkaline granites but their relationship, if any, to the carbonatites is not clear. Basic dykes and brecciated peridotite also occur.
Jen_0001120MAGMATIC STYLE: Dykes and possible dolomitized carbonatite tuff. ASSOCIATED SILICATE ROCKS: There are extensive peralkaline granites but their relationship, if any, to the carbonatites is not clear. Basic dykes and brecciated peridotite also occur.


12 Ages assigned to this locality:

Excel IDMax Age (Ma)Min Age (Ma)Age as listed in referenceDating MethodAge InterpretPrioritized?Sample SourceSample NumRun NumAge from other LocalityDated MineralMinerals explicitely stated as having this ageAge applies to these ElementsMinDat Locality IDDated Locality (Max Age)Location as listed in referenceReferenceReference DOIReference IDAge Notes
CMP168_1041_0001138512651325 ± 60Th-Pbmineralizationzircon   Zircon  720Bayan Obo Deposit (Bayun-Obo Deposit; Baiyunebo Deposit), Bayan Obo, Bayan Obo Mining District, Baotou League (Baotou Prefecture), Inner Mongolia, ChinaBayan Obo depositCampbell (2014) CMP168_1041 
CMP168_1041_0002484.3427.7456 ± 28.2Th-Pbmineralizationzircon   Zircon  720Bayan Obo Deposit (Bayun-Obo Deposit; Baiyunebo Deposit), Bayan Obo, Bayan Obo Mining District, Baotou League (Baotou Prefecture), Inner Mongolia, ChinaBayan Obo depositCampbell (2014) CMP168_1041 
Jen_0001114207020702070U-Pb zircon   Zircon  720Bayan Obo Deposit (Bayun-Obo Deposit; Baiyunebo Deposit), Bayan Obo, Bayan Obo Mining District, Baotou League (Baotou Prefecture), Inner Mongolia, ChinaBayan Obo MineYang and Woolley (2006) JAES27_559 
Jen_0001115809809809Sm-Nd whole rock     720Bayan Obo Deposit (Bayun-Obo Deposit; Baiyunebo Deposit), Bayan Obo, Bayan Obo Mining District, Baotou League (Baotou Prefecture), Inner Mongolia, ChinaBayan Obo MineYang and Woolley (2006) JAES27_559 
Jen_0001116122312231223Sm-Nd whole rock     720Bayan Obo Deposit (Bayun-Obo Deposit; Baiyunebo Deposit), Bayan Obo, Bayan Obo Mining District, Baotou League (Baotou Prefecture), Inner Mongolia, ChinaBayan Obo MineYang and Woolley (2006) JAES27_559 
Jen_0001117128612861286Sm-Nd whole rock     720Bayan Obo Deposit (Bayun-Obo Deposit; Baiyunebo Deposit), Bayan Obo, Bayan Obo Mining District, Baotou League (Baotou Prefecture), Inner Mongolia, ChinaBayan Obo MineYang and Woolley (2006) JAES27_559 
Jen_0001118131313131313Sm-Nd whole rock     720Bayan Obo Deposit (Bayun-Obo Deposit; Baiyunebo Deposit), Bayan Obo, Bayan Obo Mining District, Baotou League (Baotou Prefecture), Inner Mongolia, ChinaBayan Obo MineYang and Woolley (2006) JAES27_559 
Jen_0001119109610961096Sm-Nd whole rock     720Bayan Obo Deposit (Bayun-Obo Deposit; Baiyunebo Deposit), Bayan Obo, Bayan Obo Mining District, Baotou League (Baotou Prefecture), Inner Mongolia, ChinaBayan Obo MineYang and Woolley (2006) JAES27_559 
Jen_0001120120812081208Sm-Nd whole rock     720Bayan Obo Deposit (Bayun-Obo Deposit; Baiyunebo Deposit), Bayan Obo, Bayan Obo Mining District, Baotou League (Baotou Prefecture), Inner Mongolia, ChinaBayan Obo MineYang and Woolley (2006) JAES27_559 
PR291_202_0001131412901302 ± 12Th-Pbmineralizationzircon   Zircon  720Bayan Obo Deposit (Bayun-Obo Deposit; Baiyunebo Deposit), Bayan Obo, Bayan Obo Mining District, Baotou League (Baotou Prefecture), Inner Mongolia, ChinaBayan Obo depositZhang (2017) PR291_202 
TMA-00004566544555±11Th-Pb bastnӓsite    Ce, La, Nd, Y720Bayan Obo Deposit (Bayun-Obo Deposit; Baiyunebo Deposit), Bayan Obo, Bayan Obo Mining District, Baotou League (Baotou Prefecture), Inner Mongolia, ChinaBayan Obo REE ore depositWang et al. (1994)10.1016/0016-7037(94)90043-4GCA58_3155The combination of textural evidence and isotopic data from this study indicates that intermittent REE mineralization of the Bayan Obo deposit started at about 555 Ma, and the principal mineralization related to Caledonian subduction occurred between 474 and 400 Ma.; The most important results of this study indicate that (1) the large database of precise chronology, in conjunction with mineral replacement relation, provides evidence for a prolonged period of mineralization within the giant Bayan Obo orebody and (2) lead and neodymium isotopic compositions indicate that the source for the ores was depleted in uranium but enriched in thorium and LREEs.; note spelling as Bastnaesite in lit.
ree-002491600541Middle Proterozoic-- 1580 Ma        143972Main Pit, Bayan Obo Deposit (Bayun-Obo Deposit; Baiyunebo Deposit), Bayan Obo, Bayan Obo Mining District, Baotou League (Baotou Prefecture), Inner Mongolia, ChinaBayan Obo (Baotou)Orris and Grauch (2002) USGSOFR02_189 

SampleSource LocalityReference URL
R060251Bayan Obo Deposit (Bayun-Obo Deposit; Baiyunebo Deposit), Bayan Obo, Bayan Obo Mining District, Baotou League (Baotou Prefecture), Inner Mongolia, Chinahttps://rruff.info/R060251
R060248Bayan Obo Deposit (Bayun-Obo Deposit; Baiyunebo Deposit), Bayan Obo, Bayan Obo Mining District, Baotou League (Baotou Prefecture), Inner Mongolia, Chinahttps://rruff.info/R060248

All locality data graciously provided by mindat.org

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