OCR Text |
Show causes. What is theT I this very seri0us state WHO SUPERVISES THE SHOT-FIRER? In the past tew years, blasting has caused most of our very serious ser-ious mine disasters, there having been nearly 2 00 persons killed in mine disasters in the past three and a half years in which the disaster was Initiated by shot-firing shot-firing and shot-firers. In three of these four explosions, permissable explosives were used; In the fourth case, pellet powder was the offender. In all four cases, very pour practices were the real |