Ohio Creek prospect (Ohio Stream), Tararu, Thames-Coromandel District, Waikato Region, New Zealandi
Regional Level Types | |
---|---|
Ohio Creek prospect (Ohio Stream) | Creek |
Tararu | - not defined - |
Thames-Coromandel District | District |
Waikato Region | Region |
New Zealand | Country |
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Latitude & Longitude (WGS84):
37° 6' 4'' South , 175° 33' 20'' East
Latitude & Longitude (decimal):
Type:
KΓΆppen climate type:
Mindat Locality ID:
15450
Long-form identifier:
mindat:1:2:15450:8
GUID (UUID V4):
620118b4-ac59-4f8f-9530-49fe6f7ab225
Cu-Au-Mo prospect.
Centred on, and named after Ohio Stream, 3 kilometres north north-east of Thames. Geological speaking the area covered by the prospect is poorly constrained, with some of the references also describing neighbouring historic gold mines, which will be listed separately where enough information is found.
The prospect occupies a jog in the Hauraki graben fault, shared with other deposits in the Thames area. Dextral rotation with associated plate rotation, produced a series of dilational fractures hosting sulphidation alteration of the Ohio Stream porphyry, with more distal auriferous mesothermal veins.
There is progressive alteration zoning north-west to south east covering propylitic (epidote-chlorite); intermediate argillic (chlorite-sericite); phyllic (sericite-quartz); advanced argillic (pyrophyllite-diaspore-quartz); silicified ledges with progressively more abundant alunite; argillic (dickite, kaolinite, illite); and low grade propylitic (chlorite, carbonate, illite).
The porphyry deposit and intrusive breccia is altered to a core of potassic K feldspar-magnetite-biotite, with surrounding propylitic quartz-chlorite and epidote-pyrite calcite alteration, both overprinted by quartz-sericite-pyrite or chlorite-sericite alteration.
Lookout Rocks on the north-east border of the prospect contains a narrow core zone of quartz-alunite-dickite grading outwards to an extensive pyrophyllite-dickite-diaspore-kaolinite zone, that overlaps the upper part of the phyllic alteration zone of the Ohio Stream porphyry Cu-Au-Mo deposit.
The dacite porphyry and surrounding the intrusion contains thin quartz-anhydrite-carbonate stock work veins containing disseminated sulphides such as pyrite, molybdenite, galena, sphalerite, tetrahedrite, and chalcopyrite. Mineralisation is overall low grade with 0.12-0.20% Cu, and 0.23-0.4 g/t Au, with a vertical extent greater than 600 metres. Other minerals present which are noted are magnetite, rutile, hematite, bornite, covellite, enargite.
The veins trend sub-parallel north-east across 4 x 2 kilometres contain ore assemblages of (1) quartz-pyrite-electrum-pyrargyrite locally bonanza grades; (2) quartz-sulphides-tellurides (Au, Ag, Bi).
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsMineral List
25 valid minerals.
Rock Types Recorded
Note: data is currently VERY limited. Please bear with us while we work towards adding this information!
Select Rock List Type
Alphabetical List Tree DiagramDetailed Mineral List:
β Aikinite Formula: PbCuBiS3 |
β Alunite Formula: KAl3(SO4)2(OH)6 |
β Andalusite Formula: Al2(SiO4)O |
β Anhydrite Formula: CaSO4 |
β 'Apatite' Formula: Ca5(PO4)3(Cl/F/OH) |
β 'Biotite' Formula: K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
β Bornite Formula: Cu5FeS4 |
β Calcite Formula: CaCO3 |
β Chalcopyrite Formula: CuFeS2 |
β 'Chlorite Group' |
β Covellite Formula: CuS |
β Diaspore Formula: AlO(OH) |
β Dickite Formula: Al2(Si2O5)(OH)4 |
β Enargite Formula: Cu3AsS4 |
β Epidote Formula: (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) References: |
β Galena Formula: PbS |
β Gold Formula: Au |
β Gold var. Electrum Formula: (Au,Ag) |
β Hematite Formula: Fe2O3 |
β Kaolinite Formula: Al2(Si2O5)(OH)4 |
β 'K Feldspar' |
β Magnetite Formula: Fe2+Fe3+2O4 |
β Molybdenite Formula: MoS2 |
β Muscovite Formula: KAl2(AlSi3O10)(OH)2 |
β Muscovite var. Illite Formula: K0.65Al2.0[Al0.65Si3.35O10](OH)2 |
β Muscovite var. Sericite Formula: KAl2(AlSi3O10)(OH)2 References: |
β Pyrargyrite Formula: Ag3SbS3 |
β Pyrite Formula: FeS2 |
β Pyrophyllite Formula: Al2Si4O10(OH)2 |
β Quartz Formula: SiO2 |
β Rutile Formula: TiO2 |
β Sphalerite Formula: ZnS |
β 'Tetrahedrite Subgroup' Formula: Cu6(Cu4C2+2)Sb4S12S |
β 'Tourmaline' Formula: AD3G6 (T6O18)(BO3)3X3Z |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
Group 1 - Elements | |||
---|---|---|---|
β | Gold var. Electrum | 1.AA.05 | (Au,Ag) |
β | 1.AA.05 | Au | |
Group 2 - Sulphides and Sulfosalts | |||
β | Bornite | 2.BA.15 | Cu5FeS4 |
β | Covellite | 2.CA.05a | CuS |
β | Sphalerite | 2.CB.05a | ZnS |
β | Chalcopyrite | 2.CB.10a | CuFeS2 |
β | Galena | 2.CD.10 | PbS |
β | Molybdenite | 2.EA.30 | MoS2 |
β | Pyrite | 2.EB.05a | FeS2 |
β | Pyrargyrite | 2.GA.05 | Ag3SbS3 |
β | 'Tetrahedrite Subgroup' | 2.GB.05 | Cu6(Cu4C2+2)Sb4S12S |
β | Aikinite | 2.HB.05a | PbCuBiS3 |
β | Enargite | 2.KA.05 | Cu3AsS4 |
Group 4 - Oxides and Hydroxides | |||
β | Magnetite | 4.BB.05 | Fe2+Fe3+2O4 |
β | Hematite | 4.CB.05 | Fe2O3 |
β | Quartz | 4.DA.05 | SiO2 |
β | Rutile | 4.DB.05 | TiO2 |
β | Diaspore | 4.FD.10 | AlO(OH) |
Group 5 - Nitrates and Carbonates | |||
β | Calcite | 5.AB.05 | CaCO3 |
Group 7 - Sulphates, Chromates, Molybdates and Tungstates | |||
β | Anhydrite | 7.AD.30 | CaSO4 |
β | Alunite | 7.BC.10 | KAl3(SO4)2(OH)6 |
Group 9 - Silicates | |||
β | Andalusite | 9.AF.10 | Al2(SiO4)O |
β | Epidote | 9.BG.05a | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
β | Pyrophyllite | 9.EC.10 | Al2Si4O10(OH)2 |
β | Muscovite var. Sericite | 9.EC.15 | KAl2(AlSi3O10)(OH)2 |
β | var. Illite | 9.EC.15 | K0.65Al2.0[Al0.65Si3.35O10](OH)2 |
β | 9.EC.15 | KAl2(AlSi3O10)(OH)2 | |
β | Kaolinite | 9.ED.05 | Al2(Si2O5)(OH)4 |
β | Dickite | 9.ED.05 | Al2(Si2O5)(OH)4 |
Unclassified | |||
β | 'K Feldspar' | - | |
β | 'Biotite' | - | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
β | 'Tourmaline' | - | AD3G6 (T6O18)(BO3)3X3Z |
β | 'Chlorite Group' | - | |
β | 'Apatite' | - | Ca5(PO4)3(Cl/F/OH) |
List of minerals for each chemical element
H | Hydrogen | |
---|---|---|
H | β Alunite | KAl3(SO4)2(OH)6 |
H | β Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
H | β Diaspore | AlO(OH) |
H | β Dickite | Al2(Si2O5)(OH)4 |
H | β Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
H | β Muscovite var. Illite | K0.65Al2.0[Al0.65Si3.35O10](OH)2 |
H | β Kaolinite | Al2(Si2O5)(OH)4 |
H | β Muscovite | KAl2(AlSi3O10)(OH)2 |
H | β Pyrophyllite | Al2Si4O10(OH)2 |
H | β Muscovite var. Sericite | KAl2(AlSi3O10)(OH)2 |
H | β Apatite | Ca5(PO4)3(Cl/F/OH) |
B | Boron | |
B | β Tourmaline | AD3G6 (T6O18)(BO3)3X3Z |
C | Carbon | |
C | β Calcite | CaCO3 |
O | Oxygen | |
O | β Alunite | KAl3(SO4)2(OH)6 |
O | β Andalusite | Al2(SiO4)O |
O | β Anhydrite | CaSO4 |
O | β Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
O | β Calcite | CaCO3 |
O | β Diaspore | AlO(OH) |
O | β Dickite | Al2(Si2O5)(OH)4 |
O | β Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
O | β Hematite | Fe2O3 |
O | β Muscovite var. Illite | K0.65Al2.0[Al0.65Si3.35O10](OH)2 |
O | β Kaolinite | Al2(Si2O5)(OH)4 |
O | β Magnetite | Fe2+Fe23+O4 |
O | β Muscovite | KAl2(AlSi3O10)(OH)2 |
O | β Pyrophyllite | Al2Si4O10(OH)2 |
O | β Quartz | SiO2 |
O | β Rutile | TiO2 |
O | β Tourmaline | AD3G6 (T6O18)(BO3)3X3Z |
O | β Muscovite var. Sericite | KAl2(AlSi3O10)(OH)2 |
O | β Apatite | Ca5(PO4)3(Cl/F/OH) |
F | Fluorine | |
F | β Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
F | β Apatite | Ca5(PO4)3(Cl/F/OH) |
Mg | Magnesium | |
Mg | β Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
Al | Aluminium | |
Al | β Alunite | KAl3(SO4)2(OH)6 |
Al | β Andalusite | Al2(SiO4)O |
Al | β Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
Al | β Diaspore | AlO(OH) |
Al | β Dickite | Al2(Si2O5)(OH)4 |
Al | β Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
Al | β Muscovite var. Illite | K0.65Al2.0[Al0.65Si3.35O10](OH)2 |
Al | β Kaolinite | Al2(Si2O5)(OH)4 |
Al | β Muscovite | KAl2(AlSi3O10)(OH)2 |
Al | β Pyrophyllite | Al2Si4O10(OH)2 |
Al | β Muscovite var. Sericite | KAl2(AlSi3O10)(OH)2 |
Si | Silicon | |
Si | β Andalusite | Al2(SiO4)O |
Si | β Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
Si | β Dickite | Al2(Si2O5)(OH)4 |
Si | β Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
Si | β Muscovite var. Illite | K0.65Al2.0[Al0.65Si3.35O10](OH)2 |
Si | β Kaolinite | Al2(Si2O5)(OH)4 |
Si | β Muscovite | KAl2(AlSi3O10)(OH)2 |
Si | β Pyrophyllite | Al2Si4O10(OH)2 |
Si | β Quartz | SiO2 |
Si | β Muscovite var. Sericite | KAl2(AlSi3O10)(OH)2 |
P | Phosphorus | |
P | β Apatite | Ca5(PO4)3(Cl/F/OH) |
S | Sulfur | |
S | β Aikinite | PbCuBiS3 |
S | β Alunite | KAl3(SO4)2(OH)6 |
S | β Anhydrite | CaSO4 |
S | β Bornite | Cu5FeS4 |
S | β Chalcopyrite | CuFeS2 |
S | β Covellite | CuS |
S | β Enargite | Cu3AsS4 |
S | β Galena | PbS |
S | β Molybdenite | MoS2 |
S | β Pyrargyrite | Ag3SbS3 |
S | β Pyrite | FeS2 |
S | β Sphalerite | ZnS |
S | β Tetrahedrite Subgroup | Cu6(Cu4C22+)Sb4S12S |
Cl | Chlorine | |
Cl | β Apatite | Ca5(PO4)3(Cl/F/OH) |
K | Potassium | |
K | β Alunite | KAl3(SO4)2(OH)6 |
K | β Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
K | β Muscovite var. Illite | K0.65Al2.0[Al0.65Si3.35O10](OH)2 |
K | β Muscovite | KAl2(AlSi3O10)(OH)2 |
K | β Muscovite var. Sericite | KAl2(AlSi3O10)(OH)2 |
Ca | Calcium | |
Ca | β Anhydrite | CaSO4 |
Ca | β Calcite | CaCO3 |
Ca | β Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
Ca | β Apatite | Ca5(PO4)3(Cl/F/OH) |
Ti | Titanium | |
Ti | β Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
Ti | β Rutile | TiO2 |
Fe | Iron | |
Fe | β Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
Fe | β Bornite | Cu5FeS4 |
Fe | β Chalcopyrite | CuFeS2 |
Fe | β Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
Fe | β Hematite | Fe2O3 |
Fe | β Magnetite | Fe2+Fe23+O4 |
Fe | β Pyrite | FeS2 |
Cu | Copper | |
Cu | β Aikinite | PbCuBiS3 |
Cu | β Bornite | Cu5FeS4 |
Cu | β Chalcopyrite | CuFeS2 |
Cu | β Covellite | CuS |
Cu | β Enargite | Cu3AsS4 |
Cu | β Tetrahedrite Subgroup | Cu6(Cu4C22+)Sb4S12S |
Zn | Zinc | |
Zn | β Sphalerite | ZnS |
As | Arsenic | |
As | β Enargite | Cu3AsS4 |
Mo | Molybdenum | |
Mo | β Molybdenite | MoS2 |
Ag | Silver | |
Ag | β Gold var. Electrum | (Au,Ag) |
Ag | β Pyrargyrite | Ag3SbS3 |
Sb | Antimony | |
Sb | β Pyrargyrite | Ag3SbS3 |
Sb | β Tetrahedrite Subgroup | Cu6(Cu4C22+)Sb4S12S |
Au | Gold | |
Au | β Gold var. Electrum | (Au,Ag) |
Au | β Gold | Au |
Pb | Lead | |
Pb | β Aikinite | PbCuBiS3 |
Pb | β Galena | PbS |
Bi | Bismuth | |
Bi | β Aikinite | PbCuBiS3 |
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