TO DETERMINE THE RATIONAL RECOVERABLE TIME OF THE THREE COAL QUANTITIES OF MINE WITH SPECIAL THICK COAL SEAM

For instance of Chenjiashan Coal Mine,it was difficult to recover the developed coal reserves,the prepared coal reserves and the extraction coal reserves successively as the special thick coal seam was mined in parts though the quantities of the above three kinds of coal reserves accorded with the demands of rational recoverable time.And a new method for determining the rational recoverable time of the three coal quantities was reported.