• Highly efficient bottom discharge
  • Handles boulders up to 1500 mm
  • Low-cost maintenance
  • Dimensioned for small drifts
  • Comes in four standard sizes

RD – Rock Dumper

Our heavy-duty Rock Dumper (RD) represents more than 30 years of optimisation for large fractions and narrow spaces.

The Rock Dumper is a two-axle underground wagon capable of handling drop-loaded boulders in sizes up to 1500 mm. The wagon is designed for rolling bottom discharge and loading and has a discharge capacity of up to 17,000 tonnes per hour.

This compact solution is dimensioned for the small drifts of underground mines; the RD wagons built for the LKAB Kiruna iron ore mine have a width of 2056 mm and a height of 1825 mm. These dimensions can be adjusted according to your needs.

Thanks to the mechanical design, there is a limited amount of waste between wagons without any advanced automation. A train set of up to 25 wagons can operate with a single locomotive.

System philosophy

To lower the tare weight of the wagon, we have used ultra-high-strength steels and a high-performance wear plate system developed by LKAB; WRC System® is designed for easy plate change-outs and allows us to use wear plates as thin as 10 mm, instead of the usual 25 to 30 mm.

The flexibility of the system helps us evaluate and identify precisely the right wear plate for your fraction and mineral.

Optimised maintenance

In addition to the benefits provided by WRC System®, the RD is designed for easy changing and servicing of chevrons, bearings and wheels.

The rims and tires in the propulsion unit are standard truck components.

A proven technology

Already in the 1950s, Kiruna Wagon’s part-owner, Nybergs Mekaniska Verkstad, built underground wagons of this type for the LKAB Kiruna Mine, which is one of the largest and most modern underground iron ore mines in the world.

LKAB Rock Dumper data

Total length: 3600 mm
Distance between axle centres: 2500 mm
Height (empty): 1825 mm
Height (fully loaded): 1800 mm
Maximum width: 2320 mm
Inner width: 1668 mm
Tare weight: 11 metric tonnes
Load weight average: 19.5 metric tonnes
Load weight max: 34 metric tonnes
Body volume: 10.5 m³
Axle pressure: 14.25 metric tonnes
Max speed reverse: 20 km/h
Max speed haul: 25 km/h
Track gauge: 891 mm
Wheel diameter: 700 mm and 710 mm
Coupler distance: 3750 mm

Rock Dumper brochure in Finnish: