The Princhester Magnesite Project is located 85km north west of Rockhampton, Queensland1 and comprises two granted Mining Leases (ML), ML5831 and ML5832. The ML’s are close to the Bruce Highway and are within 2 kilometres of the main north coast railway line.
The Princhester Magnesite Project is located in the northern New England Orogen, and within the Marlborough Province.
The New England Orogen is a significant mineral province in eastern Australia, extending from Port Macquarie, New South Wales, in the south to north of Mackay, Queensland. The New England Orogen mineralisation includes significant gold mineralisation (Mount Morgan, Gympie) and various mineral deposit styles including mesothermal and epithermal gold, VMS, epithermal silver and lateritic nickel. The New England Orogen also contains economically important commodities including tin, sapphires, diamonds, molybdenum, tungsten, magnesite, cobalt and antinomy
The Marlborough province is bounded to the west by the major Yarrol Fault System, which is marked by serpentinite lenses. In the Marlborough area, these ultramafic rocks form an extensive flat-lying thrust sheet of early Paleozoic ocean floor and upper mantle (harzburgite) material. The terrain within the Princhester Magnesite Project consists of steeply dissected ridges where the serpentinite and associated rocks are deeply weathered and overlain in part by laterite. The harzburgite and serpentinite bodies are elongate north west – south east striking and are concordant with the strike of the enclosing rocks. The harzburgites have mostly been serpentinised and these, as well as the separately emplaced serpentinites have largely been weathered. The magnesite mineralisation is a mixture of magnesite, quartz and magnesia silicates which are associated with serpentinite.
Magnesite (MgCO3) is an ore for magnesium production and the source of a range of industrial minerals.
There are two main uses for magnesite. The first is as feedstock in the production of dead-burned magnesia and for refractory brick use in lining furnaces in the steel industry and non-ferrous metal processing units and cement kilns. The second use is for processing to caustic calcined magnesia which is used principally as a food supplement in agribusiness and in fertilisers as well for fillers in paints, paper and plastics. Raw magnesite is used for surface coatings, landscaping, ceramics and as a fire retardant.
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