Invincible Gold Mine (LT-17), St. Ives gold camp, Kambalda, Coolgardie Shire, Western Australia, Australiai
Regional Level Types | |
---|---|
Invincible Gold Mine (LT-17) | Mine |
St. Ives gold camp | - not defined - |
Kambalda | Town |
Coolgardie Shire | Shire |
Western Australia | State |
Australia | Country |
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Latitude & Longitude (WGS84):
31° 16' 20'' South , 121° 39' 59'' East
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
Place | Population | Distance |
---|---|---|
Stoneville | 2,841 (2016) | 46.1km |
Boulder | 5,178 (2017) | 57.0km |
Mindat Locality ID:
266305
Long-form identifier:
mindat:1:2:266305:3
GUID (UUID V4):
2f7eb76c-af25-4b62-9de3-05ea2f60e73f
The Invincible gold mine was discovered in 2012, and is set to become the biggest gold mine in the St Ives area, with open pit production due to begin in 2015. The deposit is south-west of the Bahama-Santa Ana pits near the western shore of Lake Lefroy, and 8 kilometres north-west of the Lefroy Mill. A new causeway will be built across the lake bed to the mine. It is located on the Speedway Shear Zone, with potential for further deposits along the under-explored south south-east strike. The deposit has an estimated resource of 9.2 Mt at 4.5 g/t yielding 1.30 Moz. The area was formerly called LT-17 by the mining company (Goldfields Ltd).
The deposit occurs within the regional scale Speedway-Mount Morgan Shear Zones, which transect the western limb of the Kambalda-St Ives Anticline.
Gold mineralisation is found with the Black Flags Group, a steep south-west dipping package of rocks. There is a unit of mudstone/siltstone-sandstone-quartz-greywacke-conglomerate-volcaniclastic breccia. The mudstone/siltstone is 20 to 70 metres thick, which thins to the south. Overlying this is the other rocks mentioned as the Merougil Creek Beds. This contacts the west side of the Speedway Shear. The east contact is the Morgan Island Shear. There are also three un-mineralised, east-west trending, vertical dipping, Proterozoic dolerite dykes, which intrude the sedimentary package at the north and south ends of the ore body.
The Invincible ore body is truncated to the south by the north-east trending Alpha Island Fault. There is little supergene or halo development in the overlying regolith, due according to the geologists because of the absence largely of saprolite. These Tertiary sediments are 5 to 50 metres thick, and also contains a barren palaeochannel.
Gold is found in shear lodes, and extensional veins. The shear hosted deposits are confined to the mudstone/siltstone, consisting of hydrothermal quartz breccia veins, and intensely altered wallrock clasts of albite-pyrite-carbonate-biotite-pyrrhotite-chlorite-mica. Alteration zones are albite-pyrite. Gold is visible as under 1 mm irregular blebs within aggregates of biotite, as isolated grains within quartz veins, or within microfractures filled with pyrite-biotite-chlorite within the quartz breccia.
At the microscopic level, isolated gold grains are found within pyrrhotite grains, associated with pyrite, molybdenite and native tellurium.
The extensional vein hosted deposits are found within the sandstone/greywacke/conglomerate as less than 30 cm long veins, associated with albite-hematite-pyrite alteration. Visible gold is common as less than 1 mm isolated blebs within quartz veins, or associated with chlorite-biotite near the vein wall contacts.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsCommodity List
This is a list of exploitable or exploited mineral commodities recorded at this locality.Mineral List
11 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:
ⓘ Actinolite Formula: ◻Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22(OH)2 |
ⓘ Albite Formula: Na(AlSi3O8) |
ⓘ Ankerite Formula: Ca(Fe2+,Mg)(CO3)2 |
ⓘ 'Biotite' Formula: K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
ⓘ 'Chlorite Group' |
ⓘ Dolomite Formula: CaMg(CO3)2 |
ⓘ Gold Formula: Au |
ⓘ Hematite Formula: Fe2O3 |
ⓘ 'Mica Group' |
ⓘ Molybdenite Formula: MoS2 |
ⓘ Pyrite Formula: FeS2 |
ⓘ Pyrrhotite Formula: Fe1-xS |
ⓘ Quartz Formula: SiO2 |
ⓘ Tellurium Formula: Te |
ⓘ 'Tourmaline' Formula: AD3G6 (T6O18)(BO3)3X3Z |
ⓘ 'White mica' |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
Group 1 - Elements | |||
---|---|---|---|
ⓘ | Gold | 1.AA.05 | Au |
ⓘ | Tellurium | 1.CC.10 | Te |
Group 2 - Sulphides and Sulfosalts | |||
ⓘ | Pyrrhotite | 2.CC.10 | Fe1-xS |
ⓘ | Molybdenite | 2.EA.30 | MoS2 |
ⓘ | Pyrite | 2.EB.05a | FeS2 |
Group 4 - Oxides and Hydroxides | |||
ⓘ | Hematite | 4.CB.05 | Fe2O3 |
ⓘ | Quartz | 4.DA.05 | SiO2 |
Group 5 - Nitrates and Carbonates | |||
ⓘ | Ankerite | 5.AB.10 | Ca(Fe2+,Mg)(CO3)2 |
ⓘ | Dolomite | 5.AB.10 | CaMg(CO3)2 |
Group 9 - Silicates | |||
ⓘ | Actinolite | 9.DE.10 | ◻Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22(OH)2 |
ⓘ | Albite | 9.FA.35 | Na(AlSi3O8) |
Unclassified | |||
ⓘ | 'Biotite' | - | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
ⓘ | 'Chlorite Group' | - | |
ⓘ | 'Tourmaline' | - | AD3G6 (T6O18)(BO3)3X3Z |
ⓘ | 'Mica Group' | - | |
ⓘ | 'White mica' | - |
List of minerals for each chemical element
H | Hydrogen | |
---|---|---|
H | ⓘ Actinolite | ◻Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22(OH)2 |
H | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
B | Boron | |
B | ⓘ Tourmaline | AD3G6 (T6O18)(BO3)3X3Z |
C | Carbon | |
C | ⓘ Ankerite | Ca(Fe2+,Mg)(CO3)2 |
C | ⓘ Dolomite | CaMg(CO3)2 |
O | Oxygen | |
O | ⓘ Actinolite | ◻Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22(OH)2 |
O | ⓘ Albite | Na(AlSi3O8) |
O | ⓘ Ankerite | Ca(Fe2+,Mg)(CO3)2 |
O | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
O | ⓘ Dolomite | CaMg(CO3)2 |
O | ⓘ Hematite | Fe2O3 |
O | ⓘ Quartz | SiO2 |
O | ⓘ Tourmaline | AD3G6 (T6O18)(BO3)3X3Z |
F | Fluorine | |
F | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
Na | Sodium | |
Na | ⓘ Albite | Na(AlSi3O8) |
Mg | Magnesium | |
Mg | ⓘ Actinolite | ◻Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22(OH)2 |
Mg | ⓘ Ankerite | Ca(Fe2+,Mg)(CO3)2 |
Mg | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
Mg | ⓘ Dolomite | CaMg(CO3)2 |
Al | Aluminium | |
Al | ⓘ Albite | Na(AlSi3O8) |
Al | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
Si | Silicon | |
Si | ⓘ Actinolite | ◻Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22(OH)2 |
Si | ⓘ Albite | Na(AlSi3O8) |
Si | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
Si | ⓘ Quartz | SiO2 |
S | Sulfur | |
S | ⓘ Molybdenite | MoS2 |
S | ⓘ Pyrite | FeS2 |
S | ⓘ Pyrrhotite | Fe1-xS |
K | Potassium | |
K | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
Ca | Calcium | |
Ca | ⓘ Actinolite | ◻Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22(OH)2 |
Ca | ⓘ Ankerite | Ca(Fe2+,Mg)(CO3)2 |
Ca | ⓘ Dolomite | CaMg(CO3)2 |
Ti | Titanium | |
Ti | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
Fe | Iron | |
Fe | ⓘ Actinolite | ◻Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22(OH)2 |
Fe | ⓘ Ankerite | Ca(Fe2+,Mg)(CO3)2 |
Fe | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
Fe | ⓘ Hematite | Fe2O3 |
Fe | ⓘ Pyrite | FeS2 |
Fe | ⓘ Pyrrhotite | Fe1-xS |
Mo | Molybdenum | |
Mo | ⓘ Molybdenite | MoS2 |
Te | Tellurium | |
Te | ⓘ Tellurium | Te |
Au | Gold | |
Au | ⓘ Gold | Au |
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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