Transactions . 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
Transactions . 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 stope. When the first cut has advanced part way down the stope, y^Elcvition of Sill on 500 Elev-tiou u! Sill on eoO Fig. 9.—Incline shrinkage with incline fill stope. fill is poured in the end fill hole and spread and another cut at the nextelevation is started behind the first cut. A long stope will have two cuts going on at once. Cribs of 6 in. by 6 in. by 6 ft. timber are builtup to support the back at all points that appear heavy. Most of thetimber in these cribs is saved and used over again. This flat cut-and-fill method is a cheap method and well adapted tothe nature of the deposits, as a very considerable part of the ore containslarge waste boulders. These are more easily sorted out and disposed ofin a flat cut-and-fill stope than in an incline shrinkage-with-fill , the incline shrinkage-and-fill stopes are proving to be cheaper W. ROGERS WADE AND ALFRED WANDTKE 401 by about 15 c. per ton and new stopes arc Ixing laid out to run on thissystem, providing they are in a block of ground in which the ore is not toobadly mixed
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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries
