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Mariners deposit (Mariners Decline; Mariners Ni mine), Widgiemooltha, Coolgardie Shire, Western Australia, Australia

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Latitude & Longitude (WGS84): 31° 37' 46'' South , 121° 39' 22'' East
Latitude & Longitude (decimal): -31.62968,121.65614
GeoHash:G#: qdqs03grc
Locality type:Deposit
Köppen climate type:BSk : Cold semi-arid (steppe) climate

A nickel mine located about 15 km SSE of Widgiemooltha.
Operated from 1991-1999, restarted in 2004.

Located in the middle of Lake Zot. During explorations a flood filled the lake, wrecking the exploration drillrigs, consequently the mine was named Mariners.

The deposit was discovered by Union Miniere and Anaconda Resources in the early 1970's but was not developed further due to a poor understanding of the local geology. Western Mining Corporation in the late 1980's developed a mine here from a decline on Wedding Guest Island in the middle of Lake Zot. The mine was purchased by Mincor Resources in 2001.

During Western Mining operations between 1991-1999 it produced 1 114 730 tonnes of ore at 2.53 Ni from 28 190 tonnes of nickel ore. The mine closed in 1999 due to flooding. After six months of pumping, the mine was de-watered and Mincor started mining operations which between 2004-2012 produced 1.14 million tonnes of ore at 2.6% Ni from 29 600 tonnes of nickel ore.

The orebody is hosted by a north plunging trough structure on the footwall of the contact with the Widgiemooltha Dome. It forms a series of partially overlapping kidney shaped pods of nickel sulphide ore arranged down the plunge line. Mariners has an extremely high arsenic content and common species found during the early days of mining were arsenopyrite, nickeline, gersdorffite and other arseno sulphide minerals. The komatiite host contains dominant talc-magnesite assemblages.

Commodity List

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

Mineral List

10 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

2500 - 4000 Ma

ID: 811272
undivided sedimentary and volcanic rocks 74481

Age: Archean (2500 - 4000 Ma)

Description: Undivided sedimentary (non-volcanic) and felsic volcanic rocks

Comments: sedimentary; igneous volcanic; synthesis of multiple published descriptions

Lithology: Sedimentary; igneous volcanic

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, 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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Marston, R.J. (1984) Nickel Mineralization in Western Australia. Mineral Resources Bulletin 14, Geological Survey of Western Australia, 291p. 

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