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Calwynyardah field, Calwynyardah Station, Derby-West Kimberley Shire, Western Australia, Australia

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Latitude & Longitude (WGS84): 17° 56' 53'' South , 124° 47' 10'' East
Latitude & Longitude (decimal): -17.94799,124.78613
GeoHash:G#: qub9zsdmr
Köppen climate type:BSh : Hot semi-arid (steppe) climate

Located 90 kilometres west north-west of Fitzroy crossing, the field covers 50 square kilometres, with the Great Northern Highway cutting through it. Minor amounts of diamonds have been found. The field comprises a small group of lamproite intrusions, within a few kilometres of the homestead. All but one is concealed by overburden.

The largest pipe is called Calwynyardah 1 covering 124 Ha, of almost entirely pyroclastic material, intruded by thin lamproite sills, and small plugs. Despite extensive bulk sampling of this intrusion, it yielded only one small diamond and 34 microdiamonds.

The field contains seven leucite lamproite vents. Together with nearby Laymans Bore East, they contain the only known crater lake deposits of epiclastic tuff, interbedded with a thin lignite horizon, the source states. Most of the sites are pyroclastic filled, and only a few have magmatic sills, and small plugs.

Mineral List

1 valid mineral.

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.

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Quaternary - Cenozoic
0 - 66 Ma

ID: 695066
alluvium 38494

Age: Cenozoic (0 - 66 Ma)

Description: Reworked or incised alluvium in older stream channels; alluvial terraces above younger alluvium; alluvial and colluvial outwash deposits not in defined channel systems; lateritised alluvium; sand, silt, gravel, clay, evaporites

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]

201.3 - 252.17 Ma

ID: 3187042
Mesozoic sedimentary rocks

Age: Triassic (201.3 - 252.17 Ma)

Comments: Canning Basin

Lithology: Sandstone,shale

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, used under Creative Commons Attribution 4.0 License

This page contains all mineral locality references listed on 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 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.


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Fetherston, J.M., Stocklmayer, S., Stocklmayer, V.C.(2013): Gemstones of Western Australia-mineral resources bulletin 25, Geological Survey of Western Australia (2013): 28
Department of Mines Western Australia (1990), Geology and Mineral Resources of Western Australia, Geological Survey of Western Australia, Department of Mines Western Australia, State Government of Western Australia, 1990

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