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Location: 237 km NE from Kalgoorlie - Boulder, Western Australia, Australia
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The Mulga Rock project (MRP) consists of two separate mining areas over a total length of 30km with the individual deposits ranging in length from 1km to 8km. The Mulga Rock East mining centre comprises the Ambassador and Princess deposits and the Mulga Rock West mining centre comprises the Shogun and Emperor deposits.The MRP is classed as a carbonaceous-sedimentary hosted, supergene enriched, uranium deposit. Mineralisation is hosted predominantly by unconsolidated Eocene sediments (39 Ma) which are rich in organic matter and comprise river and estuarinelake sediments. The organic matter originated primarily from land-based plant matter that washed into the channels and deposited into tributaries along the edge of an oxbow bend, forming peat. The uranium mineralisation is hosted by the organic matter in the reduced sediments below the redox front. Most of the uranium is adsorbed onto organic matter in an ionic form (i.e. uranium metal). The remainder of the mineralisation comprises ultra-fine grained uraninite (UO2) and mixed uranium oxides. The individual uranium-rich units consist of stacked lenses that have strong lateral continuity, and are spatially associated with the redox front that coincides with the present-day water table.Uranium mineralisation is hosted by flat-lying, carbonaceous clastic sediments which are in turn overlain by weathered, oxidised sediments that range in thickness from 19m to 62m of waste overburden. Most of the uranium is contained in the top mineralised lens. The ore zones are up to 38m thick, inclusive of interburden, with Ambassador and Princess deposits averaging 4.5m in thickness, and up to 8m in thickness at Shogun and Emperor with an average of 2.3m. Ambassador and Princess mineralisation is strongly polymetallic in nature, with the majority of base and other metals adsorbed on to organic matter, with sulphides and sulphates accounting for the remainder. None of the other metals occur in a form or concentration which allows for eventual economic extraction and are therefore not reported as a Mineral Resource under the JORC Code (2012).
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