Krupp Canada
The materials handling division within the ThyssenKrupp conglomerate specializes in the design and supply of open pit mining equipment and is the largest supplier of mobile crushing systems worldwide. The company has built over 100 MCS for a variety of mining applications for numerous clients around the world.
Krupp Canada, the Canadian subsidiary of ThyssenKrupp located in Calgary, specializes in designing mining equipment for the oilsands industry. The company has provided large semi-mobile crushing systems to all of the oilsands mines, and reports it is currently discussing mobile mining concepts with several oilsands operators.
Using a new technology
As with any new technology, there are benefits and challenges. Tim Joseph conducts and teaches mining equipment related research at the University of Alberta. He says one of the benefits of MCS is that it will result in a reduction in ground stability issues associated with traditional large mobile truck and shovel mining technology.
Joseph explains how oilsands operators can realize the benefits of using a MCS. “When an oilsands operator uses large mobile surface mining equipment such as a MCS, it means a reduction in the number of trucks the company has to purchase for traditional truck and shovel mining technology. Fewer trucks means a reduction in capital, maintenance, fuel costs and the road maintenance required. As well, given the current people shortage in the mining industry, using single stream mobile surface mining equipment means operators can reduce their labour force.”
However, Joseph says MCS technology is still in the early proving stages as oilsands operators and manufacturers work closely together to address the challenges of mining ore of varying bitumen content and under varying climatic conditions.
“Because [the ground in the oilsands] decreases in stability with increasing ambient temperature and bitumen content, there are still a few kinks to work out with the new technology. Ground instability is a big factor in mining oilsands with any large mobile surface mining equipment that puts down a small footprint in proportion to its weight,” he explains. “Add in the normal operational motions and vibrations and the effect is akin to patting your hand on wet sand at a shoreline – your hand sinks into the wet sand. The sheer size and weight of a unit means it can, under adverse conditions, deform the ground surface and sink.”
Manufacturers of traditional truck technology are working on alternative tire and suspension concepts that may alleviate some of the stability issues that have led to a more favourable view of MCS as a recent alternative technology. Joseph says known experience with fixed crushers and screens in oilsands processing has identified oilsand density and viscosity issues around material flow. This is an issue that would also affect the performance of a MCS.
Joseph cautions that although MCS might be a viable option for some oilsands operators, single mobile mining equipment is a single stream system, which means if it stops for any reason the entire flow of material from a given pit area also stops. Having multiple mobile units allows for one unit to stop and the overall flow of material continues.
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