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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third being manual. Forty-degree articulation each side of center provides an 80° slewing arc. The larger AT-22 has a 22-mt lifting capacity at 1.4 m radius, reducing to 1.7 mt at the maximum 15.8-m radius, while offering a top hook height of 17 m. With capacities from 35 mt to 118 mt, Terex's 16-model lineup of RT cranes offer three steering modes, a compact and rugged design, the ability to telescope the boom under load for precise load positioning, and a comfortable, ergonomic cab with intuitive controls. Their six-speed power- shift transmission and four-wheel drive allow them to access worksites even in difficult terrain. Construction is from high- strength steel, tested to withstand extreme temperatures, while their axles and superstructures are designed to with- stand mud, snow and similar challenging conditions, the company says. Link-Belt's Long-distance Runner Aside from providing adequate lifting capacity, crane mobility can be a major factor when a mining company operates from several locations. U.S. crane manufacturer Link-Belt recent- ly reported that one of its HTC-8675 Series II 70 mt hydraul- ic truck cranes had accumulated more than 17,500 km (11,000 miles) running between worksites in just 10 months. Servicing the North Dakota oil and gas industry, the crane is often called on to lift and precision place 27-mt pump units, as well as lighter production components. Highlighting the versatility of this type of crane, the machine's owners (Dacotah West Crane Service) explained that its 100 km/h (65 mph) travel speed meant that it can move quickly from site to site. In addition, the state im- poses strict load restrictions on roads during the Spring thaw season, meaning that ATs have limited use, while the Link-Belt crane's axle loading of just 5.4 mt means that it can still travel. The company noted that the HTC-8675 is easy to permit, even with all of 46 mt of counterweight on board. The triple- axle boom dolly carries all the counterweights for road travel, with fast rigging and breakdown making the crane operator- friendly in use. Zoomlion Moves Into Mining One of China's largest construction-equipment manufactur- ers, Zoomlion, produces a complete range of cranes, from RTs up to towers. In 2013, its international sales agent, Global Cranes & Machinery, reported that it had sold a Zoomlion RT55 55 mt-capacity RT to Southern Peru Copper Corp. This is one of five models in the company's RT range, which offer capacities from 35 to 100 mt. In June, Zoomlion itself reported the sale of 13 cranes to a major but unnamed copper-development project in Kazakhstan. The sale included two QUY260 crawler cranes, plus one QY100, two QY80s, four QY55s and four QY25 truck cranes. The company stated that this is the first time that a Chinese crane manufacturer has exported so many cranes to the Central Asian market, while the sale of the QUY260s marked the first foray for this crawler into this region. The crane has a maximum capacity of 260 mt at a 5-m radius on a 20-m-long boom, but can carry up to 122 m of combined main boom and luffing jib. DECEMBER 2015 • E&MJ; 63 www.e-mj.com C R A N E S & R I G G I N G