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Invincible Gold Mine (LT-17), St. Ives gold camp, Kambalda, Coolgardie Shire, Western Australia, Australia

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Latitude & Longitude (WGS84): 31° 16' 20'' South , 121° 39' 59'' East
Latitude & Longitude (decimal): -31.27240,121.66650
GeoHash:G#: qdqw0e4c4
Locality type:Mine
Köppen climate type:BSk : Cold semi-arid (steppe) climate


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.







Commodity List

This is a list of exploitable or exploited mineral commodities recorded at this locality.


Mineral List


8 valid minerals.

Rock Types Recorded

Note: this is a very new system on mindat.org and data is currently VERY limited. Please bear with us while we work towards adding this information!

Select Rock List Type

Alphabetical List Tree Diagram

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org

Quaternary
0 - 2.588 Ma



ID: 901180
lake deposits 38492

Age: Pleistocene (0 - 2.588 Ma)

Description: Lake and swamp deposits; mud, silt, evaporites, limestone; minor sand, peat

Comments: regolith; synthesis of multiple published descriptions

Lithology: Regolith

Reference: Raymond, O.L., Liu, S., Gallagher, R., Zhang, W., Highet, L.M. Surface Geology of Australia 1:1 million scale dataset 2012 edition. Commonwealth of Australia (Geoscience Australia). [5]

Neoarchean - Mesoarchean
2500 - 3200 Ma



ID: 3189181
Archean sedimentary rocks

Age: Archean (2500 - 3200 Ma)

Comments: Yilgarn Craton

Lithology: Sedimentary rocks

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

Data and map coding provided by Macrostrat.org, used under Creative Commons Attribution 4.0 License



This page contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.

References

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Ahmed, A., Van Klavern, N., Tossel, G., Zutah, S., Edmonds, P., Wingad, S., Megas, A., Sanderson, D., Woodcock, J., Crawford, M. (2014), The Invincible Deposit: From Discovery Hole to Million Ounce + Resource in Under 2 Years, Australian Institute of Geoscientists Symposia, Kalgoorlie, 08-10 October, 2014

 
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