Engineering & Mining Journal

AUG 2017

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88 E&MJ • AUGUST 2017 www.e-mj.com PROCESSING SOLUTIONS W Resources (WRES), operator of the La Parrilla tungsten/tin mine in southwest- ern Spain, has installed two alljig fi nes jigs from German supplier allmineral, and anticipates that the upgrade will provide a signifi cant boost toward doubling annual output to 5,000 metric tons (mt) per year in the future. According to allmineral, the mining company also expects to see an increase in product quality as a result of deploying this processing technology. The largest known tungsten deposits in the western world that can be mined cost-effectively are found some 300 ki- lometers (km) southwest of Madrid. The La Parrilla mine, located near the Portu- guese border, is one of fi ve sites on the Iberian Peninsula mined by WRES. By intensifying and optimizing its ore min- ing operations in the Extremadura region, the British mining company is looking to surpass the annual output of what is cur- rently the world's largest tungsten mine — Masan Resources' Núi Pháo operation in northern Vietnam — by 2020. Around 90% of the world's production of tung- sten goes toward making tungsten steel, the raw material for tool steels. At La Parilla, the extraction emphasis is on scheelite, which is fl oated and then enriched into concentrates containing more than 65% of the mixed oxide called tungstate. The Parrilla mine also extracts cassiterite for its high tin content. The mine operators are aiming for an over- all metal recovery of at least 90% from the processed ore. According to allmineral, the jig plant's throughput of 350 mt/hour (mt/h) will provide reliable and adaptable separation, concentration and cleaning of preground ore (2 to 10 millimeter [mm] grain size). The air-pulsed twin machines are physi- cally stable in operation, said allmineral, allowing an optimum jigging stroke with a minimum of energy consumption. The feed material is fi rst loosened and fl uid- ized by pulsating water, forming layers of grains according to their density, and sub- sequently separating the heavy material from the stratifi ed material bed. The jig- ging motion used to separate the particles Air-pulse Jigs Bolster Spanish Tungsten Mine Production Plans The jigging plant installed at W Resources' La Parilla mine is similar in confi guration to the plant shown here (top) at an operation in Italy, according to equipment supplier allminerals. The cutaway diagram illustrates the internal confi guration of the La Parilla installation.

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