The Systems/Ground Control Interface and Jts Impact on Mining Method Selection

摘要: SUMMARY Selection of mining method and optimizing productivity for mines at depth presents special problems. In room pillar increased size may be countered by increasing width to maintain or improve the percentage underground coal extracted. However, these actions can cause ground control problems which frequently result in serious interruptions production. Mining costs resulting from such practices increase with higher extraction ratios. For design purposes cost losses due high risk must weighed against minimizing improving conditions selecting another as longwall shortwall. The economic impact system caving methods including a variety depth, height, rock strength, roof floor geometry has been assessed. Potential advantages decreased operating cost, utilization reserves, extended life mine are evaluated comparison retreat mining.