Tungsten Ore Industry Developments-VII

Tasmania Mines Ltd (Tasmines) continued production of by-product tungsten (approximately 35 tonnes of WO3 in 2012) at its Kara magnetite mine, 35 kilometres south of Burnie in northwest Tas. The mine, which has been operating since 1977, produces magnetite and scheelite from skarn mineralisation that has replaced carbonates within Cambrian and Ordovician sediments close to the Devonian Housetop Granite. In January 2013, Tasmines released updated resource figures for the mine, including, at Kara No 1, total resources of 16.58 Mt at 49% iron oxide (FeO) and 440 parts per million (ppm) WO3, which includes Measured Resources of 10.21 Mt at 199ppm WO3, and Indicated Resources of 4.60 Mt at 714ppm WO3. In addition, updated resource figures for the Eastern Ridge Magnetite Skarn, are 6.50 Mt at 48.3% FeO and 0.10% WO3, which includes Indicated Resources of 5.24 Mt at 0.12% WO3 while at Kara North 266 and the Northern Magnetic Anomaly there is a combined Inferred Resources of 14.55 Mt at 43.5% FeO and 462ppm WO3. Ore reserves, as of January 2013, for the Kara No 1 pit comprise Proven and Probable Reserves of 13.07 Mt at 45.4% FeO and 340 ppm WO3 with 71% of the Reserves in the Proven category. Based on this reserve estimate, the company indicates a mine life of 18.4 years for the Kara No 1 pit.

 

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