Six O&K rigid dump trucks, delivered more than 15 years ago in Europe, remain in top condition even after hauling more than 30Mt of porphyry; considered one of Europe’s toughest and most abrasive minerals with a compressive strength of 40,000psi. The trucks feature Trellex rubber lining plates from Metso Minerals in the dump bodies to provide high wear resistance and ensure a long service life.
Operating out of the Porfibel quarry in Belgium, the trucks belong to the Gravex Group which also operates 16 other quarries.
At Porfibel, the dump bodies are regularly checked for wear and tear with the quarry workshop replacing on average three individual plates as required each year. According to plant workshop manager Galio Laureiro, the life span of the plates is dependent on many factors including the shape of the rock and place of impact.
“Even the skill of the loader operators is a factor,” Laureiro says. He adds a minimum of two years is expected in the main impact area of the dump body, whilst plates on the sidewalls each last between five and six years.
Measuring up to 1500 x 750mm, the plates feature a 100mm thick rubber pad vulcanised to a 5mm thick metal plate bolted to the dump body. The rubber pads deaden the noise for the operator and nearby workers. “It also provides more comfort for the operator and offers significant savings for the hydraulics system with reduced impact,” Laureiro said. Material dumped by the O&K haulers into a tremie and scalper, feeds the 'dragon' in the primary stage of crushing. The wear plates protect the crusher's steel linings to ensure continued operation.