LOAD & HAUL
LIGNITE IN SOUTH TEXAS: FAST LOADING At the other open cast mine in Texas, the Wirtgen 4200 SM was bought in 2014, when two old miners were approaching the end of their service lives.
“Te 4200 SM is technologically superior in terms of its hydraulics and control system. What is more, it loads dumpers 30 to 40% faster than the older models. I love this machine,” says the driver. “It runs much more quietly than our previous surface miner. Te cabin is very comfortable and the machine is so easy to operate. Te video cameras also show me the area directly behind the cutting drum unit, ensuring that I don’t penetrate too deep into the interburden.” Compared with the mining methods used in the past, the 4200 SM produces fewer fines and more material in the target grain size, with a high degree of purity, reducing coal washing costs at the processing plant and enhancing the quality of the end product, enabling the coal to be sold at a more profitable price.
ECONOMICAL AND SAFE Often the use of surface miners offers a more economical, eco-friendlier and safer alternative to conventional mining by drilling and blasting. Te surface miner can cut, crush and load the material in a single
The 4200 SM from Wirtgen crushes the lignite to a maximum grain size of 10cm during the mining process
Lignite loading: the driver loads a tandem coal train within minutes in the mine in South Texas; this then drives some 26km to unload the material at the power plant
pass. Dispensing with drilling and blasting, the application causes no destructive vibrations, making this process a great deal safer. Dust and noise pollution is also much lower. As a result, material can even be extracted in areas directly adjacent to residential areas and industrial estates. Apart from reducing machinery and personnel costs, the process is also time- saving. And surface miners produce level, stable surfaces – a great advantage for mine
logistics: ordinary trucks can travel over the routed access roads transporting the material more quickly. Tey are also more cost-effective to acquire and maintain than dumpers.
Erik Zimmermann is product manager, mining at Wirtgen.
www.wirtgen.com
XxAuthor Name xx is with Wirtgen.
www.wirtgen.com
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