Engineering and Mining Journal - Whether the market is copper, gold, nickel, iron ore, lead/zinc, PGM, diamonds or other commodities, E&MJ takes the lead in projecting trends, following development and reporting on the most efficient operating pr
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BAUMA PREVIEW 2013 Wirtgen Displays Surface Miners and Screens The Wirtgen Group's Mineral Technologies division will display a well-matched range of products for mining and mineral processing: Wirtgen surface miners and Kleemann crushing and screening machines. Some shallow, relatively soft deposits can be mined effectively using surface miners. These units grind coal and iron ore from the formation with a special cutting roller. Slewing conveyor systems can load the material onto waiting haul trucks or place it in windrows alongside the surface miner. Wirtgen offers three classes, the 2200 SM, 2500 SM and 4200 SM, which have cutting widths of 2.20 m to 4.20 m and cutting depths of 20 cm to 83 cm up to a uniaxial compressive strength of 120 MPa. Special machines can even cut hard granite up to 260 MPa. Wirtgen claims to be the only manufacturer that covers a performance spectrum from 100 metric tons per hour (mt/h) to 3,000 mt/h. Kimberley Metals Group (KMG) recently put the Kleeman machines to the test. At its Ridges project, located in the Kimberley region of Western Australia, in 2011, iron ore is extracted from a mountain ridge, taken by haul truck to a central location and processed. The processing itself is handled www.e-mj.com A combination of mobile MC 125 Z jaw crushers with mobile cone crushers and the triple-decker MCO 13 S screen unit in the Australian Outback. by SJ Crushing as a subcontractor of KMG. "The major challenge for us was going very quickly from submitting our bid to a stable production of 500 mt/h," said Neil Fitzpatrick, project manager, SJ Crushing. "The director and owner of SJ Crushing, Steve Crabbe, saw clearly that he needed a decisive advantage to be awarded the contract. And he found that advantage in equipment from Kleemann, with its robust design and its diesel-electric power concept," said Fitzpatrick. Crabbe discovered Kleemann at bauma 2007 and made contact when the call for tenders was issued for the project. The mobile solution, consisting of a MOBICAT MC 125 Z mobile jaw crusher and three MOBICONE MCO 13 S secondary crushers was developed in close cooperation with the Kleemann experts from Germany. Because the initially anticipated project duration was very short, just four years, it quickly became clear that the solution would have to be a mobile one. The equipment in the mine is also quickly movable in case of changing conditions or requirements. The ore is transferred to the MOBICAT MC 125 Z by wheel loader. The size of the material recovered by the surface miners ranges from 0-200 mm, while the blasted material can have edges up to 1,000 mm long. In addition, the compressive strength of the material can be far above 300 MPa. The mobile cone crushers break the material down to a final grain size of 0-10 mm, each of the three units generating the end product. The material from the bottom and to some extent the middle deck of the tripledecker screen units is passed on to the next MARCH 2013 • E&MJ; 53