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:
Hugo Mine, Keystone, Keystone District, Pennington Co., South Dakota, USA

Oldest recorded age at locality: 1700
Youngest recorded age at locality: 1700

mindat Locality ID: 9911
mindat URL: http://www.mindat.org/loc-9911.html

Tectonic Settings:

Total number of sublocalities beneath "Hugo Mine, Keystone, Keystone District, Pennington Co., South Dakota, USA": 0
Total number of bottom-level sublocalities: 0

Latitude: 43°52'16"N
Longitude: 103°25'30"W
Decimal Degree (lat, lon): 43.871111111111,-103.425
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 As B Be Ca Cd Cu F Fe H K Li Mg Mn Na O P S Si Sn U Zn 

Elements from minerals reported directly at this locality: Al As B Be Ca Cd Cu F Fe H K Li Mg Mn Na O P S Si Sn U Zn 

Structural Groups for minerals in this locality: 
AluniteAmphiboleApatiteArsenopyriteBerylChildreniteClayClinozoisiteDufréniteEpidote
FeldsparFluoriteGarnetLöllingiteMicaNoneNot in a structural groupOlivinePharmacosideritePyroxene
QuartzRutileSmectite-vermiculiteSphaleriteStanniteStauroliteTourmalineTripliteWardite

38 IMA Minerals at location:
Actinolite  (*)Albite  (*)Almandine  (*)Amblygonite  (*)Arsenopyrite  (*)
Augelite  (*)Beryl  (*)Cassiterite  (*)Černýite  (*)Childrenite  (*)
Crandallite  (*)Diopside  (*)Dufrénite  (*)Eosphorite  (*)Epidote  (*)
Fluorapatite  (*)Heterosite  (*)Kësterite  (*)Löllingite  (*)Microcline  (*)
Montebrasite  (*)Montmorillonite  (*)Morinite  (*)Muscovite  (*)Orthoclase  (*)
Pharmacosiderite  (*)Quartz  (*)Schorl  (*)Scorodite  (*)Sicklerite  (*)
Sillimanite  (*)Spodumene  (*)Staurolite  (*)Triphylite  (*)Triplite  (*)
Uraninite  (*)Varlamoffite  (*)Wardite  (*)
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)21700170003419
Albite  (*)FeldsparNa(AlSi3O8)1700170008803
Almandine  (*)GarnetFe2+3Al2(SiO4)31700170002353
Amblygonite  (*)NoneLiAl(PO4)F170017000244
Arsenopyrite  (*)ArsenopyriteFeAsS1700170009052
Augelite  (*)NoneAl2(PO4)(OH)317001700079
Beryl  (*)BerylBe3Al2Si6O181700170004286
Cassiterite  (*)RutileSnO21700170005171
Černýite  (*)Stannite SphaleriteCu2CdSnS41700170008
Childrenite  (*)ChildreniteFe2+Al(PO4)(OH)2·H2O17001700093
Crandallite  (*)AluniteCaAl3(PO4)(PO3OH)(OH)6170017000310
Diopside  (*)PyroxeneCaMgSi2O61700170004135
Dufrénite  (*)DufréniteCa0.5Fe2+Fe3+5(PO4)4(OH)6·2H2O170017000139
Eosphorite  (*)ChildreniteMn2+Al(PO4)(OH)2·H2O170017000128
Epidote  (*)Epidote ClinozoisiteCa2(Al2Fe3+)[Si2O7][SiO4]O(OH)1700170008173
Fluorapatite  (*)ApatiteCa5(PO4)3F1700170002740
Heterosite  (*)OlivineFe3+(PO4)170017000204
Kësterite  (*)Stannite SphaleriteCu2ZnSnS417001700082
Löllingite  (*)LöllingiteFeAs2170017000762
Microcline  (*)FeldsparK(AlSi3O8)1700170004924
Montebrasite  (*)NoneLiAl(PO4)(OH)170017000200
Montmorillonite  (*)Clay Smectite-vermiculite(Na,Ca)0.3(Al,Mg)2Si4O10(OH)2·nH2O1700170001508
Morinite  (*)NoneNaCa2Al2(PO4)2(OH)F4·2H2O17001700022
Muscovite  (*)Mica ClayKAl2(Si3Al)O10(OH)217001700017380
Orthoclase  (*)FeldsparK(AlSi3O8)1700170002349
Pharmacosiderite  (*)PharmacosideriteKFe3+4(AsO4)3(OH)4·6-7H2O170017000428
Quartz  (*)QuartzSiO217001700061156
Schorl  (*)TourmalineNaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH)1700170002705
Scorodite  (*)NoneFe3+(AsO4)·2H2O1700170001153
Sicklerite  (*)OlivineLiMn2+(PO4)17001700066
Sillimanite  (*)Not in a structural groupAl2SiO51700170001516
Spodumene  (*)PyroxeneLiAlSi2O6170017000688
Staurolite  (*)StauroliteFe2+2Al9Si4O23(OH)170017000978
Triphylite  (*)OlivineLiFe2+(PO4)170017000313
Triplite  (*)TripliteMn2+2(PO4)F170017000233
Uraninite  (*)FluoriteUO21700170002718
Varlamoffite  (*)Rutile(Sn,Fe)(O,OH)217001700056
Wardite  (*)WarditeNaAl3(PO4)2(OH)4·2H2O17001700058


1 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
Alexandra-0372170017001700 Age of pegmatite   Yes Li, Be, Sn, Cs, Ta, Nb, U122418Black Elk Peak (Harney Peak), Pennington Co., South Dakota, USAHarney PeakNorton and Redden (1990)10.2138/am.2008.2633AM75_631 

SampleSource LocalityReference URL
R070179Hugo Mine, Keystone, Keystone District, Pennington Co., South Dakota, USAhttps://rruff.info/R070179
R070529Hugo Mine, Keystone, Keystone District, Pennington Co., South Dakota, USAhttps://rruff.info/R070529

All locality data graciously provided by mindat.org

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