Sally Malay

Western Australia, WA, Australia

Main commodities: Ni Cu Co PGE PGM
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The Sally Malay nickel deposit is hosted by one of an extensive suite of mafic and ultramafic intrusives within the late Palaeoproterozoic Halls Creek Mobile Zone in far northern Wsetern Australia, formed on the eastern margin of the Kimberley Block.

The late Palaeoproterozoic host intrusive comprises a rhythmically layered body of olivine gabbro, troctolite, norite and minor anorthosites and other ultramafics, with ultramafic basal zones containing nickel sulphides. This intrusive was emplaced into granulite facies rocks, as were most of the mineralised intrusives in the district.

The Sally Malay mineralisation is regarded as being typical magmatic nickel /copper /cobalt /platinum group metals in massive sulphides. The ore is dominantly composed of pyrrhotite /chalcopyrite /pentlandite and occurs as two, steeply dipping lenses of massive sulphide (>40% total sulphide) of 3 to 40 metres in thickness, hosted by the basal norite zone within the layered ultramafic complex.

The "footwall lens" is found at the base of the norite on the contact with the footwall gneiss, while the "hangingwall lens" may be up to 15 metres stratigraphically higher, although both lenses merge toward the west. In addition to the massive sulphides, there are significant zones of stringer and disseminated mineralisation within the norite between the main lenses and into the hangingwall.

The main orebody has an east-west strike and dips steeply to the north. A well defined, 270 m long gossan marks the surface projection of the ore body which is terminated to the west by a fault. To the east ore appears to pinch out. A major fault dislocates the ore body at about 500 metres below surface with an offset of approximately 150 metres separating the "upper resource" from the "lower resource" below the fault.

The resources published in 2001 totalled: 3.736 Mt @ 1.74% Ni, 0.72% Cu, 0.09% Co, 2.16 g/t PGE to the 500m Fault.

The most recent source geological information used to prepare this summary was dated: 2003.    
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

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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