Small Mine Selective Blasting
January 2000 by Dr. Ralph E. PrayDrill holes in a mineralized vein often penetrate hidden layers of poor ore which, after blasting, end up diluting the production quality. Disseminated gold ores carrying two ounces per ton may be identical in appearance to adjacent vein material...
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I wandered back across the river, wading through the rapids and slipping at least three more times. I couldn’t believe how slick these rocks were! Once on the other side, I sat down for a few moments to review my plan of attack and lick my wounds.
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In the simplest sense, drills can be divided by their mode of action—percussion, rotary or a mixture of the two.
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