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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 (38000)	4/10/2007 7:33:06 PM
From: E. Charters	Read Replies (1) \| Respond to of 78419

Reaming isn't fun. Ask any boss. Yes, I believe they were three inches. Hell, the blast holes were 1.75" USDL regs... 30 CFR § 33.35 Methods of drilling; dust-collector unit. (a) General. All drilling shall be done with conventional, commercial drilling equipment pneumatic--percussion, hydraulic-rotary, and/or electric-rotary types--in accordance with the applicant's specifications. (b) Pneumatic-percussion drilling. A stoper-type drill with a piston diameter of 2 1/2 to 3 inches shall be used for roof drilling, A hand-held, sinker-type drill with a piston diameter of 2 1/2 to 3 inches shall be used for down drilling and also for horizontal drilling, except that the drill shall be supported mechanically. Compressed air for operating the drill shall be supplied at a gage pressure of 85-95 pounds per square inch. Drill bits shall be detachable, cross type with hard inserts, and shall be sharp when starting to drill each set of 10 holes. In roof drilling, 1 1/4- and 1 1/2-inch diameter drill bits shall be used; in horizontal and down drilling, 1 3/4-inch diameter bits shall be used. The drill steel shall be 7/8-inch hexagonal and of hollow type to permit the introduction of compressed air through the drill steel when necessary to clean a hole during drilling. ************************