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Gold/Mining/Energy : Gold and Silver Juniors, Mid-tiers and Producers -- Ignore unavailable to you. Want to Upgrade?

To: hank2010 who wrote (37996)	4/10/2007 7:07:19 PM
From: E. Charters	Read Replies (1) \| Respond to of 78417

You use a reaming bit or hole enlarger to 3.5 inches. Drill 8 feet, enlarge 3 holes out of 6 in the center cut to say 3 inches and that is your centre cut, or relief cut. Load the other three holes. If you have nine such holes in a sinking cut of 8' X 18', then your total relief to the first helper holes is 63.58 inches, which is almost equivalent to the area of your 10 inch center relief hole. So you need 9 holes; 3 in each 8X6 area to break even. If you are breaking in to these center cuts, your blast pattern is much different. You are blasting three areas each to a cut hole triangle of initially 14 inches on a side, to the next helpers, 10 inches out from the 14 inch faces, giving sides of 24 inches to the next triangle cut out. You can make a diamond with one more hole, and the holes after that blast in and around to that relief. If you want to maximize the chance the whole round goes and no part freezes, then you have to go to a mass sinking cut after developing your relief, and forget trying to blast sequentially in each of your boxes into the relief areas.