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Location: 35 km NW from Tennant Creek, Northern Territory, Australia
17 Brown StreetTennant CreekNorthern Territory, Australia0860
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Any major discovery or extension to an existing mine with a Scoping Study containing more than 250,000 oz of gold, as at White Devil, will be treated as a separate Major Mine Joint Venture. Emmerson may either maintain its equity by contributing 25% or elect to be free carried at 10% through completion of a Definitive Feasibility Study (DFS). While contributing, ERM may claw back 15% to re-establish a 40% interest in the Major Mine, subject to certain conditions. Emmerson has advised Tennant Mining of its intention to contribute to ongoing activities at White Devil and to exercise its clawback rights. Accordingly, the Company will retain a 40% contributing interest in the White Devil Project.
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GeologyTennant Creek Au-Cu-Bi mineralisation is typically hosted in hematite-magnetite-quartz-jasper ironstones within the Lower Proterozoic Warramunga Formation.Locally the Warramunga Formation consists of interbedded greywacke, sandstone and shale, weathered at the surface to a deep red to orange colour. Below the oxidised zone, the sediments are pale green to grey-green in colour. Bedding thickness varies from a fine parallel lamination in shale (1 to 5 mm), to thick, massively bedded sandstone and greywacke (0.5 to 3 m). Cutting through the sediments are two structural corridors, both are characterised by strong chlorite alteration, which is oxidised to haematite in the 100 or so metres below the surface. Chlorite alteration is gradational from the surrounding sediments, peaking towards the centre of the structures. Bodies of hematite ± magnetite ± quartz, locally termed ironstones, are located in both structures.Cutting through the sediments are a number of quartz + feldspar porphyries. The porphyries are characterised by a quartz + feldspar groundmass with quartz “eyes” typically between 0.5cm to 1.0cm long. Larger feldspar crystals are common with sizes from 1.0cm to 2.0cm. Quartz veins are also common, trending roughly east-west and steeply dipping.White Devil is situated in a northwest trending structural corridor. The gold-bearing ironstone bodies at White Devil strike NW-SE, are steeply dipping with high grade lodes plunging northwest within the overall ironstone units. There is an apparent overall easterly plunge, however this apparent easterly plunge could be as a result of the data density and location of drill data. White Devil produced 761,072oz of gold at a head grade of 14.6g/t gold from 1987 to mid-1999. Mining ceased as a result of the low gold price at this time and not due to depletion of the deposit.In the mine area, bedding and a slatey cleavage (S1) strike E-W and have been lifted sub-vertically by the associated shears of the thrust. This movement developed a second semi-ductile to brittle deformation event generating a fabric S2 close to S1 in orientation. This phase which is controlled access to the mineralising fluid into the Fe-Mg-Si alteration complex. A later series of subvertical, NW trending quartz-feldspar porphyry dykes cut through the mine area, truncating and sinistrally offsetting several ore lenses.Mineralisation occurs predominantly with the ironstones.While the porphyries truncate the mineralization, low grade mineralisation occurs on the margins and a small proportion of porphyry lithology is included within the mineralised envelope.Dimensions• The White Devil deposit Mineral Resource has an approximate strike length of 1,400m;• The plan width of mineralised zones in the model ranges from 3 m to 30m, with a depth range of from surface to 500m below surface.
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