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Golden Kilometre Gold Mine (GK Shoot), Mount Pleasant, Black Flag Goldfield, Kalgoorlie-Boulder Shire, Western Australia, Australia

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Latitude & Longitude (WGS84): 30° 30' 35'' South , 121° 13' 31'' East
Latitude & Longitude (decimal): -30.50984,121.22554
GeoHash:G#: qdw4qtcer
Locality type:Mine
Köppen climate type:BSh : Hot semi-arid (steppe) climate


Golden Kilometre is a mine in the Mount Pleasant complex, with the Lady Bountiful mine to the north, and to the south a tailings pond storage area and machinery sheds. There are several pits in the immediate area of Golden Kilometre, including one filled in with tailings. The mine produced 2.5 Mt at 4.2 g/t.

The deposit is hosted by the quartz-gabbro Mount Pleasant Sill, basalt, and a shale horizon between the two. Economic mineralisation is largely confined to the quartz-gabbro sill, with minor amounts in adjacent units.

The sill is the most fractured, and Fe rich rock in the Greenstone succession. The greater brittle quartz content has mean't it is more amenable to fracturing, thus allowing gold carrying fluids more access to the rock. Gold mineralisation is controlled by brittle-ductile strike slip faults, associated systems of laminated quartz veins, related altered wall rock, and minor brecciation zones. The major quartz veins are up to 1 metre wide, laminated, with narrow ribbons of pyritized wall rock.

There are three distinct ore shoots called Golden Kilometre, North and North-South. Mineralisation for Golden Kilometre occurs along a main D fault 2 to 6 metres thick. It splays and anastromoses along its length. South and North-South mineralisation is controlled by an oblique fault. South is a major quartz shoot, and has numerous splays of variable orientations, with a wide alteration halo. The highest gold grades is where veins intersect. North-South is a narrow 1 to 2 metre massive to poorly laminated quartz veins and brecciated zones.

Alteration in wall rock shows actinolite-chlorite, replaced by chlorite-albite-biotite-calcite. within a chlorite-calcite distal zone. Intense alteration near the veins is to muscovite-ankerite-pyrite-pyrrhotite-chalcopyrite-sphalerite-arsenopyrite. The muscovite-ankerite zone can be sub-divided into a distal pyrrhotite and proximal pyrite sub-zones.

In the wall rock, gold occurs as discrete particles in gangue and sulphide minerals. Gold occurs in the quartz veins as coarse grains 1-2 mms, with recrystallised quartz, or with sericite, chlorite and ankerite. Gold bearing veins also contain minor galena, sphalerite, pyrrhotite, chalcopyrite and scheelite.




Commodity List

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


Mineral List


17 valid minerals.

Rock Types Recorded

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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: 931895
colluvium 38491

Age: Pleistocene (0 - 2.588 Ma)

Description: Colluvium and/or residual deposits, sheetwash, talus, scree; boulder, gravel, sand; may include minor alluvial or sand plain deposits, local calcrete and reworked laterite

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: 3187518
Archean volcanic rocks

Age: Archean (2500 - 3200 Ma)

Comments: Yilgarn Craton

Lithology: Greenstone belt; mafic-ultramafic volcanic 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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Econ Geol (1997) 92:407-437
Witt, W.K., Groves, D.I., Ho, S.E. (ed.) (1994), Ore Deposits of the Eastern Goldfields Western Australia, Excursion Guidebook 8, 12th Australian Geological Convention, Geological Society of Australia (W.A. Division), September 1994

 
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