|Latitude & Longitude (WGS84):||31° 10' 57'' South , 121° 40' 10'' East|
|Latitude & Longitude (decimal):||-31.18266,121.66952|
|Köppen climate type:||BSk : Cold semi-arid (steppe) climate|
The source states this is the first nickel mine developed in Western Australia via the Silver Lake shaft. It is the second largest shoot in the Kambalda area.
The komatiite flow is 50-100 metres thick. The host contains peridotite, talc, magnesite, chlorite, dolomite and antigorite. The Footwall is dark grey-green metabasalt, locally epidotised and biotitic. It also contains pillow zones, and massive Fe-Ni sulphides, between the pillows, and quartz veins locally.
The deposit is contained in the Lunnon Trough which contains the bulk of the mineralisation, and Lunnon East, bounded by moderate to high angle reverse faults. The trough is 100-150 metres wide, 1800 metre long, dipping south south-west at 20 degrees, and at one point 10 degrees north north-west.
At the extreme north-west of the shoot is the Silver Lake deposit, now mined out. It is a separate small trough like structure to the Lunnon Trough's west in much faulted and folded rock.
In the Lunnon Trough, massive ore is 0.5 to 1.5 metres thick, overlain by 2-4 metres of disseminated to matrix ore. The massive ore is interlayers of pyrite-pentlandite, pyrite lenses, and quartz veins.
Primary ore is pyrrhotite, pentlandite, pyrite, chalcopyrite, magnetite, and chromite. The pyrrhotite-pentlandite ratio is 2:3. Massive ore grades at 9% Ni, hanging wall ore 17% Ni.
Commodity ListThis is a list of exploitable or exploited mineral commodities recorded at this locality.
25 valid minerals.
Rock Types Recorded
Select Rock List TypeAlphabetical List Tree Diagram
Entries shown in red are rocks recorded for this region.
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
0 - 2.588 Ma
Age: Pleistocene (0 - 2.588 Ma)
Comments: regolith; synthesis of multiple published descriptions
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). 
|Neoarchean - Mesoarchean|
2500 - 3200 Ma
|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.