Design and optimization of the mining method of boundary coal-pillars with high recovery ratio and high efficiency;

The new stopping methods,or pseudo-declivity mining,upper entry forging ahead and lower entry forging ahead extraction methods,are adopted to recover triangle coal for the purpose of reducing the loss of coal and enhancing the recovery ratio,which has ensured to reduce the loss amount of coal to the minimum and raised economy benefits for Xinli mine.

Based on the actual state in Fengshuigou Coal Mine, provides the technology ways of lifting coal extracion rate, which are reforming coal winning machine, reducing thickness loss, adjusting mining triangle coal, reducing area loss, reforming extraction process and extracting goaf.