By mining the mineral deposit by cutting, a Wirtgen Surface Miner at the Chorado mine in Grajaú in North-Eastern Brazil eliminates the need for conventional extraction methods such as drilling and blasting and enables cost-efficient operations with minimal harmful emissions. The deployment of the 220 SM creates a new technological focus on productivity, sustainability, and safety.
The Surface Miner realizes a vision for the future
In Brazil, resources have been mined and quarried by drilling and blasting for over 100 years. Blasting and drilling has also been the standard method for years by Gesso Integral at the open-cast mine. However, for CEO Marcos Vasconcelos Ferreira, this environmentally damaging method, with its particular need for strict safety precautions, no longer represented a forward-looking solution.
“We wanted to achieve high productivity with a tight focus on sustainability,” Ferreira shared. During his search for a more sustainable and efficient extraction method, the company CEO came across the Surface Miner from Wirtgen, that cuts, crushes, and, if required, loads the cut and crushed rock into trucks in a single pass. The raw materials are selectively extracted in its purest quality, which allows optimum exploitation of mineral deposits. The potential of the machine and the advantages of the new extraction method were clear: no more drilling, no more blasting, lower emissions, increased safety on the open-cast mining site, and outstanding cost-efficiency. The deployment of the first Surface Miner was a technological game changer that more than doubled productivity at the open-cast mine. The purchase of a second 220 SM Surface Miner enabled production at the mine to be increased by 84 percent.
A personal success story
The success story also has a personal side to it. The company was deliberately looking for an operator with no previous experience with large machines for the new Surface Miner. Marlete Ribeiro Souza Guajajára was recruited locally and trained as a machine operator. “My boss told me that he needed an unskilled person he could train from scratch for the job. And that person turned out to be me. At the time, I had never even learned how to ride a bike, a motorcycle or drive a car,” she shared. His trust in the abilities of his new employee paid off. In the meantime, working with the Surface Miner has become second nature to Marlete, and she knows how to make the best of the machine’s advantages. “It’s a very comfortable machine that makes our daily work here much easier.”
Efficient mining operations with the 220 SM
Mining by cutting enables the selective extraction of raw materials with outstanding purity. It also reduces noise and dust emissions and increases safety at the mine. With the low-vibration extraction, the method also enables the exploitation of mineral deposits in the immediate neighbourhood of infrastructure or residential areas. With an average cutting depth of 23 centimetres and a cutting width of 2.2 metres, the Surface Miner enables the company to achieve a production volume of 1.25 million tonnes of gypsum per year. The piece sizes of the cut and crushed material are already ideal for numerous commercial uses and eliminate the need for a classical pre-crushing stage. The Chorado Mine in Grajaú clearly illustrates how increased efficiency and sustainability in the extraction of mineral resources can go hand-in-hand with greater safety in open-cast mining.
