MINING METHOD

The demensions of pillar and galleries and the shape of pillar,formed in any seam or section shall be such as to ensure stabilty during the formation and extraction of pillar and during the period between such formation and extraction.Save with the previos permission in writing of the regional inspector and subject to such conditions as he may specify therin no gallery ina seam or section shall exceed three meter in hight or4.8meter in width at any place.The pillar formed in any seam or section shall normally be rectangular in shape.The distance between the center's of any two adjacent pilar left in seam or section shall not be less than that specified in the appended table as corresponding to the depth of the seam or section form the sureface at that point and the width of the gallery in the working in question.

          When the aim of blasting is to get 1umpy coal or to minimise the formation of coal dust then this blasting is done.in this blasting low density high Explosive are used.                                                                                  In this blasting the hole is first charged with Explosive.The Explosive charge is pushed into the holes followed by one or two piastic air bags.Remaining length of the hole is stemmed by stemming material.in it air bags work as cushion blasting.Such blasting with air gap is known as cushion blasting.