Open-Pit Drilling and Blasting at Craigmont Mines Limited
J.M. Gihbs Craigmont Mines Ltd., Merritt, B.C
Craigmont Mines Limited mine 50,000 tons of ore and waste per day from the open pit at Merritt, British Columbia. An electric-powered "down-the-hole" drill, a diesel- powered rotary drill and two electric-powered rotary drills have been used. All primary drilling, as a result of cost and operating experience, is now performed with two electric-powered rotary drills. Trials with various loading techniques have increased the amount of AN-FO and decreased the amount of commercially prepared slurries used for primary blasting. Approximately 95 per cent of the primary blasting is accomplished with AN-FO, mixed at the hole.
blasting, Drill, Drilling, drilling and blasting, Hole Loading Pattern at Craigmont, Merritt, British Columbia, open-pit, ore, Drills, Ore, Ores, Waste, Wastes