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How does highwall mining improve on auger mining?
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coal mining
Schematic diagram of an underground coal mine, showing surface facilities, access shafts, and room-and-pillar and longwall mining methods.
Highwall mining is an adaptation of auger mining that significantly improves upon the traditional method by utilizing a remotely operated continuous miner instead of a drill.
Key improvements include:
- Increased Reach: While auger mining is typically limited to depths of 60 to 100 metres, highwall mining entries can extend 300 to 400 metres into the coal seam.1
- Enhanced Productivity and Safety: By using a continuous miner controlled from a surface cabināaided by television camerasāthe process achieves higher productivity and greater safety for operators compared to augering.1
- Efficiency: The cut coal is transported out via conveyors behind the miner, which is more effective than the spiral extraction method used in augering.1
- Cost-Effectiveness: Highwall mining offers lower operational costs than traditional auger mining.1
These advancements allow for more efficient extraction of coal from seams exposed by surface mining while overcoming many of the depth and structural limitations inherent in the auger technique.12