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Mallina Basin Gold - Withnell, Camel

Western Australia, WA, Australia

Main commodities: Au
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The 200 x 90 km, northeast trending Mallina Basin is developed between the East Pilbara and West Pilbara granite greenstone terranes and contains the 3020 to 2950 Ma Whim Creek greenstone belt and the 2970 to 2940 Ma DeGrey Group.

The Whim Creek greenstone belt comprises a lower 3009 Ma felsic to mafic volcanic group, overlain by a sequence of abundant clastic material derived from the lower volcanics, and followed by high Mg basalts.

The DeGrey group is composed of a lower turbiditic sandstone unit overlain by shale rich facies which are followed unconformably by the 2770 to 2680 Fortescue Group volcanics.

These rocks are intruded by 2946±6 Ma alkaline granites, 2954 to 2945 Ma high Mg diorite, 2941 to 2931 high K monzogranite and a late syn-Fortescue 2765±5 Ma monzogranite.

The basin hosts a number of small gold deposits that fall into three types, namely:
1). lode Au associated with sericite-carbonate-pyrite alteration, the largest of which is the Withnell deposit within the east-west trending Mallina shear zone which comprises two parallel zones of steep south dipping and moderatley west plunging shoots over strike lengths of several hundred metres within turbidite hosts.
2). lode Au deposits associated with pyrophyllite-bearing alteration assemblages, the largest of which is the Camel deposit, some 3 to 5 km west of Withnell.   It comprises 5 mineralised zones with similar geometry and controls to Withnell.   Ore occurs in a number of moderately south dipping stacked quartz veins within strongly silicified and carbonate altered siltstone and greywacke with 4 to 7 g/t Au over widths of up to 20 m.
3). lode Sb-Au prospects (e.g., the Mallina and Peawah prospects)

The Camel and Withnell deposits combined have a resource of 4.96 Mt @ 2.08 g/t Au for 10.32 tonnes of contained gold.

For detail consult the reference(s) listed below.

The most recent source geological information used to prepare this summary was dated: 2002.    
This description is a summary from published sources, the chief of which are listed below.
© Copyright Porter GeoConsultancy Pty Ltd.   Unauthorised copying, reproduction, storage or dissemination prohibited.


  References & Additional Information
   Selected References:
Huston D L, Blewett R S, Keillor B, Standing J, Smithies R H, Marshall A, Mernagh T P, Kamprad J  2002 - Lode Gold and epithermal deposits of the Mallina Basin, North Pilbara terrain, Western Australia: in    Econ. Geol.   v97 pp 801-818


Porter GeoConsultancy Pty Ltd (PorterGeo) provides access to this database at no charge.   It is largely based on scientific papers and reports in the public domain, and was current when the sources consulted were published.   While PorterGeo endeavour to ensure the information was accurate at the time of compilation and subsequent updating, PorterGeo takes no responsibility what-so-ever for inaccurate or out of date data, information or interpretations.

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