In this post we will discuss about the Charge preparation for underground blasting... For blasting, the charging of hole may consist of one or more cartridge and the separation of cartridge should be least as much possible. Among the charged explosive in a hole, it is necessary that a Detonator is inserted in one of the explosive. The cartridge having Detonator in it, called prime cartridge. To insert Detonator, a hole is maked with a Pricker of brass or wood. Insert the Detonator until it is completely buried in explosive after that put back the flap of cartridge and bind the cartridge around with wire to prevent the detonator to come out during charging. Charging of Shot Holes Proper charging of shot hole is important to get the desire results. We follows two methods to Charge the holes.. 1. Direct Initiation 2. Inverse Initiation Here we will discuss these two methods.. Preparation of Shot Hole Direct Initiation This is the method of Chargi...