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:
Omai, Upper Takutu-Upper Essequibo Region, Guyana

Oldest recorded age at locality: 2095
Youngest recorded age at locality: 1997

mindat Locality ID: 13111
mindat URL: http://www.mindat.org/loc-13111.html

Tectonic Settings:

Total number of sublocalities beneath "Omai, Upper Takutu-Upper Essequibo Region, Guyana": 7
Total number of bottom-level sublocalities: 6

Number of Child Localities: 1
Child Localities:
Omai Gold Mine

Latitude: 5°26'26"N
Longitude: 58°45'37"W
Decimal Degree (lat, lon): 5.4405555555556,-58.760277777778
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: Ag Al Au B Bi C Ca Cr Cu Fe H Hg K Li Mg Mo Na Ni O Pb S Si Te Ti W Zn 

Elements from minerals reported directly at this locality: 

Structural Groups for minerals in this locality: 
ArsenicCalciteChalcopyriteClayClinozoisiteCopperCorrensiteCorundumDiasporeEpidote
FeldsparKaoliniteMeloniteMicaMolybdeniteNickelineNonePyriteQuartzRocksalt
RutileScheeliteSphaleriteSpinelTetradymiteTitaniteTourmaline

36 IMA Minerals at location:
Albite  (*)Altaite  (*)Ankerite  (*)Bismuth  (*)Calaverite  (*)
Calcite  (*)Chalcopyrite  (*)Coloradoite  (*)Copper  (*)Corrensite  (*)
Dravite  (*)Ephesite  (*)Epidote  (*)Galena  (*)Goethite  (*)
Gold  (*)Guyanaite  (*)Hematite  (*)Hessite  (*)Kaolinite  (*)
Magnetite  (*)Melonite  (*)Molybdenite  (*)Muscovite  (*)Nacrite  (*)
Petzite  (*)Pyrite  (*)Pyrrhotite  (*)Quartz  (*)Rutile  (*)
Scheelite  (*)Sphalerite  (*)Tellurobismuthite  (*)Tetradymite  (*)Titanite  (*)
Volynskite  (*)
Mineral nameStructural GroupsIMA FormulaMax Age (Ma)Min Age (Ma)# of Sublocalities containing mineralLOCALITY IDs, not mindat ids# of localities containing mineral
Albite  (*)FeldsparNa(AlSi3O8)20951997264758,647608803
Altaite  (*)RocksaltPbTe20951997264758,64760489
Ankerite  (*)NoneCa(Fe2+,Mg)(CO3)220951997264758,647603092
Bismuth  (*)ArsenicBi209519971647581966
Calaverite  (*)MeloniteAuTe220951997264758,64760361
Calcite  (*)CalciteCa(CO3)20951997264758,6476027770
Chalcopyrite  (*)ChalcopyriteCuFeS220951997264758,6476027198
Coloradoite  (*)SphaleriteHgTe20951997264758,64760169
Copper  (*)CopperCu20951997264758,647603846
Corrensite  (*)Corrensite Clay(Ca,Na,K)1-x(Mg,Fe,Al)9(Si,Al)8O20(OH)10·nH2O2095199716475849
Dravite  (*)TourmalineNaMg3Al6(Si6O18)(BO3)3(OH)3(OH)20951997164758648
Ephesite  (*)MicaNaLiAl2(Si2Al2)O10(OH)22095199716475821
Epidote  (*)Epidote ClinozoisiteCa2(Al2Fe3+)[Si2O7][SiO4]O(OH)20951997264758,647608173
Galena  (*)RocksaltPbS20951997264758,6476024243
Goethite  (*)DiasporeFeO(OH)209519971647587437
Gold  (*)CopperAu20951997364758,64760,6476330554
Guyanaite  (*)NoneCrO(OH)209519971647586
Hematite  (*)CorundumFe2O320951997264758,6476014640
Hessite  (*)NoneAg2Te20951997264758,64760804
Kaolinite  (*)Clay KaoliniteAl2Si2O5(OH)4209519971647585591
Magnetite  (*)SpinelFe2+Fe3+2O420951997264758,6476014899
Melonite  (*)MeloniteNiTe220951997264758,64760207
Molybdenite  (*)MolybdeniteMoS220951997264758,647605800
Muscovite  (*)Mica ClayKAl2(Si3Al)O10(OH)220951997264758,6476017380
Nacrite  (*)Clay KaoliniteAl2Si2O5(OH)420951997164758112
Petzite  (*)NoneAg3AuTe220951997264758,64760409
Pyrite  (*)PyriteFeS220951997264758,6476039462
Pyrrhotite  (*)NickelineFe7S820951997264758,647609056
Quartz  (*)QuartzSiO220951997364758,64760,6476361156
Rutile  (*)RutileTiO220951997264758,647605614
Scheelite  (*)ScheeliteCa(WO4)20951997264758,647604894
Sphalerite  (*)SphaleriteZnS20951997264758,6476021482
Tellurobismuthite  (*)TetradymiteBi2Te320951997264758,64760276
Tetradymite  (*)TetradymiteBi2Te2S20951997164758510
Titanite  (*)TitaniteCaTi(SiO4)O209519971647584899
Volynskite  (*)NoneAgBiTe220951997264758,6476064


2 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-0302200719972002±5U-PbAge og hydrothermal mineralizationfeldspar, titanite, apatite, rutileOM95-2, OM95-26, OM95-28   Au16661Omai Gold Mine, Omai, Upper Takutu-Upper Essequibo Region, GuyanaOmaiNorcross et al. (2000)10.1016/S0301-9268(99)00102-3PR102_69 
Alexandra-0303209520932094±1U-PbAge og hydrothermal mineralizationtitanite, apatiteOM95-2, OM95-4   Au16661Omai Gold Mine, Omai, Upper Takutu-Upper Essequibo Region, GuyanaOmaiNorcross et al. (2000)10.1016/S0301-9268(99)00102-3PR102_69 

SampleSource LocalityReference URL

All locality data graciously provided by mindat.org

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