The Wirtgen 280 SM(i) is a high-performance surface miner designed for the reliable and selective extraction by direct loading, sidecasting, or cut-to-ground. Raw materials are extracted and crushed in a single operation — without drilling and blasting, and with minimal environmental impact. The 280 SM(i) is driven by four steerable and height-adjustable crawler units. The machine is highly maneuverable and can be quickly turned at the end of a cut. The Level Pro Active automatic leveling system maintains the specified cutting depth with consistent high precision and no need for additional aids.
The 9 ft (2,750 mm) cutting drum unit with a cutting depth of up to 26 in. (650 mm) is precisely adaptable to each specific application and achieves outstanding cutting performance with minimal pick wear. Wear-resistant toolholder systems ensure optimal pick utilization and minimal downtimes. The soft rock drum is designed especially for high material flows in soft cutting conditions. In contrast, the hard rock cutting drum ensures maximum durability in harder formations.
The operator’s cabin contributes to the operator’s ability to exploit the full potential of the machine and maximize productivity. Wirtgen said the 280 SM(i) surface miner is therefore the tool of choice for cost-efficient mining processes in the 120-ton class.
The high-performance, hydraulically height-adjustable, rear discharge conveyor with a movable counterweight can be slewed to the right and left by 90°, enabling the loading of 100-ton haul trucks. The operator can continuously vary the speed of the belt independent of the engine speed to reduce belt wear depending on the material volume and the piece-size of the mined material.
Entirely new standards are set by the dust-sealed and air-conditioned positive-pressure cabin with fresh air filtration, which effectively prevents the entering of dust into the operator’s workplace. Mounted on the front left chassis column, the operator’s cabin, with all round glazing, is decoupled from the machine body and can be rotated by 90° in both directions. Up to six cameras can also be installed to provide even better all-round vision. Various automatic functions also contribute to operator comfort, reduce the risk of fatigue, assist the operator in the achievement of high productivity rates, and make the overall process more efficient.
For the new surface miner, Wirtgen offers innovative technologies that minimize impact on the environment and conserve valuable natural resources. Thanks to the reduction of carbon emissions through low specific fuel consumption, an efficient water management system, and effective solutions for the minimization of dust pollution, the 280 SM(i) shows that environmental and economic considerations can be compatible and are closely interconnected.