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DRUMMOND 2

With this method, as much as 4,600 tons of coal have been extracted from one highwall miner hole of 275 meters in length. Currently two holes per day are being mined. The speed at which the machine mines the coal is approximately 4.32 centimeters per second, a very high velocity if talking in terms of excavations. Control cabin 5All functions are controlled from the operations cabin with two video screens. From there the operators (two American supervisors and one Colombian) utilize special software that controls all movements of the system. Hydraulic Cylinders 3Reinforced steel push beams shaped like long rectangular steel boxes are connected to the system to push the cutting head underground, and at the same time, they transport the extracted coal to the surface using two augers that are inside each push beam. These pieces are the spinal column of the machine since they also serve as a duct for the supply chain through which the control cables, communications, electricity, hydraulic lines, and water all go through. When the methane gas concentration inside the highwall hole is 2%, the machine automatically shuts down, as the risk of an explosion may be present. Apart from the supervisors, six mechanics and helpers also work on the machine. 6When another hole is driven into the seam, a minimum distance between the holes, called a pillar, is maintained in order to support the rock strata above the machine. The mining plan also calls for barrier pillars to remain in place to add additional support to the rock strata above. 4After the coal is discharged from the highwall mining system, a conveyor belt piles all the coal so that front end loaders can load it into large haul trucks for transport to the train loading station. 7The entire Highwall Mining system can be controlled by an application used from a portable computer or a cell phone. Push beams that connect to each other www.drummondltd.com 11 Infographic: Alejandra Sarmiento


DRUMMOND 2
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