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:
Little Erma Mine, San Rafael District (San Rafael Swell), Emery Co., Utah, USA

Oldest recorded age at locality: 410
Youngest recorded age at locality: 82

mindat Locality ID: 182334
mindat URL: http://www.mindat.org/loc-182334.html

Tectonic Settings:

Total number of sublocalities beneath "Little Erma Mine, San Rafael District (San Rafael Swell), Emery Co., Utah, USA": 2
Total number of bottom-level sublocalities: 2

Number of Child Localities: 2
Child Localities:
Little Erma No. 1
Little Erma No. 2 Claim

Latitude: 38°37'38"N
Longitude: 110°45'56"W
Decimal Degree (lat, lon): 38.627222222222,-110.76555555556

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 C Ca Cu Fe H K O S Si U 

Elements from minerals reported directly at this locality: Al C Cu H O Si 

Structural Groups for minerals in this locality: 
AllophaneAluniteFluoriteGypsumMalachiteNone

5 IMA Minerals at location:
Chrysocolla  (*)Gypsum  (*)Jarosite  (*)Malachite  (*)Uraninite  (*)
Mineral nameStructural GroupsIMA FormulaMax Age (Ma)Min Age (Ma)# of Sublocalities containing mineralLOCALITY IDs, not mindat ids# of localities containing mineral
Chrysocolla  (*)Allophane(Cu2-xAlx)H2-xSi2O5(OH)4·nH2O1178203531
Gypsum  (*)GypsumCa(SO4)·2H2O1178212726166890
Jarosite  (*)AluniteKFe3+3(SO4)2(OH)61178212726162228
Malachite  (*)MalachiteCu2(CO3)(OH)211782012537
Uraninite  (*)FluoriteUO21178212726162718



Locality Notes from all Ages at Locality:
Age IDLocality Notes
Giersdorf_00000547Urano-organic ore associated with a collapse structure in Triassic Sandstone, part of the Chinle Formation. Uranium Ore is found over a wide stratigraphic range
Giersdorf_00000548Urano-organic ore associated with a collapse structure in Triassic Sandstone, part of the Chinle Formation. Uranium Ore is found over a wide stratigraphic range
Giersdorf_00000549Urano-organic ore associated with a collapse structure in Triassic Sandstone, part of the Chinle Formation. Uranium Ore is found over a wide stratigraphic range
Giersdorf_00000550Urano-organic ore associated with a collapse structure in Triassic Sandstone, part of the Chinle Formation. Uranium Ore is found over a wide stratigraphic range
Giersdorf_00000551Urano-organic ore associated with a collapse structure in Triassic Sandstone, part of the Chinle Formation. Uranium Ore is found over a wide stratigraphic range
Giersdorf_00000552Urano-organic ore associated with a collapse structure in Triassic Sandstone, part of the Chinle Formation. Uranium Ore is found over a wide stratigraphic range


6 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
Giersdorf_00000547868284±2238U-206U uraniniteK-154 YesUraniniteUraniniteU180697Calyx No. 8, Temple Mountain, San Rafael District (San Rafael Swell), Emery Co., Utah, USASan Rafael SwellMiller et al. (1963)10.1130/0016-7606(1963)74[609:IEOTOO]2.0.CO;2GSAB74_609Age given for U238-Pb206 analysis
Giersdorf_00000548968691±5235U-207Pb uraniniteK-154 YesUraniniteUraniniteU180697Calyx No. 8, Temple Mountain, San Rafael District (San Rafael Swell), Emery Co., Utah, USASan Rafael SwellMiller et al. (1963)10.1130/0016-7606(1963)74[609:IEOTOO]2.0.CO;2GSAB74_609Age given for U235-Pb207 analysis
Giersdorf_00000549410260335±75207Pb-206PbThe Pb207-Pb206 age given for these samples is described as being highly erroneous due to the systematic sensitivity of the analytic methodslowuraniniteK-154 YesUraniniteUraniniteU180697Calyx No. 8, Temple Mountain, San Rafael District (San Rafael Swell), Emery Co., Utah, USASan Rafael SwellMiller et al. (1963)10.1130/0016-7606(1963)74[609:IEOTOO]2.0.CO;2GSAB74_609Age given for Pb207-Pb206 analysis
Giersdorf_00000550104100102±2238U-206U uraniniteK-155 YesUraniniteUraniniteU182883North Mesa 9 & 10, North Mesa Mine Group, Temple Mountain, San Rafael District (San Rafael Swell), Emery Co., Utah, USASan Rafael SwellMiller et al. (1963)10.1130/0016-7606(1963)74[609:IEOTOO]2.0.CO;2GSAB74_609Age given for U238-Pb206 analysis
Giersdorf_0000055111797107±10235U-207Pb uraniniteK-155 YesUraniniteUraniniteU182883North Mesa 9 & 10, North Mesa Mine Group, Temple Mountain, San Rafael District (San Rafael Swell), Emery Co., Utah, USASan Rafael SwellMiller et al. (1963)10.1130/0016-7606(1963)74[609:IEOTOO]2.0.CO;2GSAB74_609Age given for U235-Pb207 analysis
Giersdorf_00000552335185260±75207Pb-206PbThe Pb207-Pb206 age given for these samples is described as being highly erroneous due to the systematic sensitivity of the analytic methodslowuraniniteK-155 YesUraniniteUraniniteU182883North Mesa 9 & 10, North Mesa Mine Group, Temple Mountain, San Rafael District (San Rafael Swell), Emery Co., Utah, USASan Rafael SwellMiller et al. (1963)10.1130/0016-7606(1963)74[609:IEOTOO]2.0.CO;2GSAB74_609Age given for Pb207-Pb206 analysis


SampleSource LocalityReference URL


All locality data graciously provided by mindat.org

All age data...

Other copyright data...