Gold and Silver Juniors, Mid-tiers and Producers Message Board

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Gold/Mining/Energy : Gold and Silver Juniors, Mid-tiers and Producers

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To: hank2010 who wrote (38003)	4/10/2007 7:55:13 PM
From: Condor	Read Replies (1) of 78421

I've been away from the face too long now to remember. Our bits for jacklegs and stopers were colour coded so just cycled the colours. Cuts were three holes and arch the backs. The last many years most drilling was electric hydraulic (1 1/2 " holes x 12 ft)using one-two and three boom jumbos depending on widths and layouts. Bolting was also elec. hydraulic. A lot of 7 x 7 Alimak raises for blast hole and vertical retreat slashing (80 ft to 150 ft stopes as I recall). In the hole drilling was 3 1/2 inch (or 4 ?). I expect there has been some nifty technological advancements now and I wonder what they're doing now.

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