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Terex SHM, Supplies Highwall Mining System to the Tuva Republic of Siberian, Russia

Wednesday, January 30th, 2008

West Virginia based Terex SHM recently signed a contract with Eniseiskaya Industrial Company in Moscow, Russia for the delivery of a highwall coal mining system. After a two month journey by ship, truck, and train, the Terex SHM Highwall Miner will arrive in the newly developed Elegest coalfield in the Tuva Republic where it will mine high quality coking coal. The Tuva Republic is located in Southern Siberian Russia on the Mongolian border. In March, a group of Russian coal operators and maintenance engineers will travel to Terex SHM headquarters in Beckley, WV to train on this innovative mining machine.
Now in its second generation, Terex SHM’s highwall miner is a self-contained, remotely operated coal mining system. Designed for safety and durability, a three or four-man team can operate and maintain this highwall miner from the surface. No crewmember is ever required to go underground thus providing a very safe working environment.
Depending on the height of the coal seam being recovered, each highwall miner can produce an average of 40,000-120,000 short tons of coal per month.
In terms of resource recovery, it can extract up to 70% of the in-situ coal, while operating on contour benches – or in trench-mining applications – with a footprint as narrow as 42 ft. The Terex SHM base-frame vehicle is carried on four hydraulically powered crawler units that give 360-degree mobility and allow the machine to be positioned precisely in front of each entry, even if the highwall is irregular.
Interchangeable electric cutterhead modules mine coal-seam heights ranging from 28 in to 15 ft. The sumping force is transmitted to the cutterhead by means of 20 ft-long fully enclosed pushbeams. As the cutterhead pushes into the seam, the cut coal is carried by a pair of 18 in-diameter conveying augers that run inside the pushbeams, a major advantage of this mining system being that any rock that falls from the entry roof lands on top of the pushbeam and cannot contaminate the coal being transported inside it. Once the cut coal has arrived back at the base frame, it is discharged either directly into waiting haulers or to a stockpile for subsequent loading out.
In addition to providing the drive transfer and conveyance of cut coal, the enclosed pushbeams play one further vital role. All of the service connections from the base frame to the cutterhead including the electrical power, control, water, hydraulic lines and methane sensors are contained within an armored cable that is automatically unwound from a large-diameter drum on the base frame as each pushbeam is added. Resting in a groove in the top of the pushbeam, the cables, and hoses are completely protected from falling roof rock, and are rewound onto the drum once an entry has been mined out and the cutterhead is being recovered.
The power available on the Terex SHM base frame unit is sufficient to allow the highwall miner to mine entries over 1,000 ft in depth.
The pushbeams have vertical flexibility at each joint allowing the highwall mining system to work in seams that pitch and roll, with the cutterhead following the floor and roof of the seam and the pushbeams following its path regardless of the floor conditions. Advanced Gamma Detection technology allows the machine operator to precisely guide the advancing cutterhead from the Siemens Step 7 equipped control cab.
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