Transactions . ^^^^^^Mw////////////////////// Limit Commorcial Ore —y?—~ii->^-^ t Chute 1. •^ Couutj ]lock \i all Fig. 8.—Flat cut-and-fill stope. 7-ft. () cut off the back, then run up fill hole raises 50 ft. ( m.)apart along the center line of the stope to the level above, stand a timberline of 10 by 10 in ( cm.) sawed timber, making the drift 5by8ft. ( m.) in the clear; double lag over the caps and single lag on thesides. Chutes with manways are provided every 30 ft. ( m.). These 400 GEOLOGY AND MINING METHODS AT PILARES MINE chutes arc 4 ft. (> in. sq
Transactions . ^^^^^^Mw////////////////////// Limit Commorcial Ore —y?—~ii->^-^ t Chute 1. •^ Couutj ]lock \i all Fig. 8.—Flat cut-and-fill stope. 7-ft. () cut off the back, then run up fill hole raises 50 ft. ( m.)apart along the center line of the stope to the level above, stand a timberline of 10 by 10 in ( cm.) sawed timber, making the drift 5by8ft. ( m.) in the clear; double lag over the caps and single lag on thesides. Chutes with manways are provided every 30 ft. ( m.). These 400 GEOLOGY AND MINING METHODS AT PILARES MINE chutes arc 4 ft. (> in. square ( in.) inside measurement, and are linedwith 2 by 10 in. (5 by cm.) plank. The chutes have arc doors 30by 30 in. ( by cm.) in size. Waste is now poured down the fillholes covering the timber line and spread level. This filling work is doneon contra,ct by the cubic foot, the engineers first measuring the space tobe filled and computing the volume. The cut is then started at one endof the stope around a fill hole and carried 7 ft. ( m.) high the lengthof the s
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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries
