Alpha Island area, St. Ives gold camp, Kambalda, Coolgardie Shire, Western Australia, Australiai
| Regional Level Types | |
|---|---|
| Alpha Island area | Area |
| St. Ives gold camp | - not defined - |
| Kambalda | Town |
| Coolgardie Shire | Shire |
| Western Australia | State |
| Australia | Country |
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Latitude & Longitude (WGS84):
31° 14' 15'' South , 121° 41' 0'' East
Latitude & Longitude (decimal):
Type:
KΓΆppen climate type:
Mindat Locality ID:
291228
Long-form identifier:
mindat:1:2:291228:1
GUID (UUID V4):
d23bbb36-cfa6-4861-b7ed-e03f6f26aaca
The Alpha Island area is part of the Lake Lefroy salt-pan, just south of Red Hill. The island and deposit have since been obscured by nearby gold mining on the salt-pan, and the resultant spreading of tailings across the lake.
Discovered in 1973. Trough like structures with nickel mineralisation above the trough, often disrupted by faults. Basal metasediment containing albite-quartz-Fe sulphides.
The host is olivine peridotite, with talc-carbonate rock, and some antigorite on the eastern flank. The Footwall is metabasalt, pillowed and biotitic, some quartz-carbonate veinlets. Grey dacitic sill like intrusions, amphibolite, and feldspar megacrysts are common.
The troughs are up to 2 kilometres long, mineralisation up to one metre wide. Most mineralisation is Hanging Wall ore. This contains pyrite, pentlandite, millerite, magnetite, chalcopyrite as disseminated blebs, veinlets, lenses of matrix to massive sulphides. Pyrrhotite is sparse. Nickel grades are 7-17% Ni, averaging 13.7% Ni.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsMineral List
9 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 Albite Formula: Na(AlSi3O8) |
| β 'Biotite' Formula: K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
| β Chalcopyrite Formula: CuFeS2 |
| β 'Fayalite-Forsterite Series' |
| β 'Feldspar Group' |
| β Magnetite Formula: Fe2+Fe3+2O4 |
| β Millerite Formula: NiS |
| β Pentlandite Formula: (NixFey)Ξ£9S8 |
| β Pyrite Formula: FeS2 |
| β Pyrrhotite Formula: Fe1-xS |
| β Quartz Formula: SiO2 |
| β Talc Formula: Mg3Si4O10(OH)2 |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 2 - Sulphides and Sulfosalts | |||
|---|---|---|---|
| β | Pentlandite | 2.BB.15 | (NixFey)Ξ£9S8 |
| β | Chalcopyrite | 2.CB.10a | CuFeS2 |
| β | Pyrrhotite | 2.CC.10 | Fe1-xS |
| β | Millerite | 2.CC.20 | NiS |
| β | Pyrite | 2.EB.05a | FeS2 |
| Group 4 - Oxides and Hydroxides | |||
| β | Magnetite | 4.BB.05 | Fe2+Fe3+2O4 |
| β | Quartz | 4.DA.05 | SiO2 |
| Group 9 - Silicates | |||
| β | Talc | 9.EC.05 | Mg3Si4O10(OH)2 |
| β | Albite | 9.FA.35 | Na(AlSi3O8) |
| Unclassified | |||
| β | 'Biotite' | - | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
| β | 'Feldspar Group' | - | |
| β | 'Fayalite-Forsterite Series' | - | |
List of minerals for each chemical element
| H | Hydrogen | |
|---|---|---|
| H | β Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
| H | β Talc | Mg3Si4O10(OH)2 |
| O | Oxygen | |
| O | β Albite | Na(AlSi3O8) |
| O | β Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
| O | β Magnetite | Fe2+Fe23+O4 |
| O | β Quartz | SiO2 |
| O | β Talc | Mg3Si4O10(OH)2 |
| F | Fluorine | |
| F | β Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
| Na | Sodium | |
| Na | β Albite | Na(AlSi3O8) |
| Mg | Magnesium | |
| Mg | β Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
| Mg | β Talc | Mg3Si4O10(OH)2 |
| Al | Aluminium | |
| Al | β Albite | Na(AlSi3O8) |
| Al | β Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
| Si | Silicon | |
| Si | β Albite | Na(AlSi3O8) |
| Si | β Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
| Si | β Quartz | SiO2 |
| Si | β Talc | Mg3Si4O10(OH)2 |
| S | Sulfur | |
| S | β Chalcopyrite | CuFeS2 |
| S | β Millerite | NiS |
| S | β Pentlandite | (NixFey)Ξ£9S8 |
| S | β Pyrite | FeS2 |
| S | β Pyrrhotite | Fe1-xS |
| K | Potassium | |
| K | β Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
| Ti | Titanium | |
| Ti | β Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
| Fe | Iron | |
| Fe | β Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
| Fe | β Chalcopyrite | CuFeS2 |
| Fe | β Magnetite | Fe2+Fe23+O4 |
| Fe | β Pentlandite | (NixFey)Ξ£9S8 |
| Fe | β Pyrite | FeS2 |
| Fe | β Pyrrhotite | Fe1-xS |
| Ni | Nickel | |
| Ni | β Millerite | NiS |
| Ni | β Pentlandite | (NixFey)Ξ£9S8 |
| Cu | Copper | |
| Cu | β Chalcopyrite | CuFeS2 |
Other Regions, Features and Areas containing this locality
Australia
- Western Australia
- Kambalda Nickel Metallogenic ProvinceGeologic Province
- West Australian ElementCraton
- Yilgarn CratonCraton
Australian PlateTectonic Plate
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References
