Transactions . Granby Minim. Methods 395 can he widened out until the sides of the glory hole get too flatfor the ore to run. Machines are also put to work where the con-nections lict ween the raise- have been made and at other ad-vantageoua places. The stope may thus be turned back to meetthe hanging wall and the pillars reduced in size, or where the natureof the ground permits, a pillar may be eliminated to Figure IX shows a part of the stopes aboveNo. 3 Tunnel and shows the progress between March, 1905 andMarch. 1908. Figure X is a photograph of a series of pillarsabove
Transactions . Granby Minim. Methods 395 can he widened out until the sides of the glory hole get too flatfor the ore to run. Machines are also put to work where the con-nections lict ween the raise- have been made and at other ad-vantageoua places. The stope may thus be turned back to meetthe hanging wall and the pillars reduced in size, or where the natureof the ground permits, a pillar may be eliminated to Figure IX shows a part of the stopes aboveNo. 3 Tunnel and shows the progress between March, 1905 andMarch. 1908. Figure X is a photograph of a series of pillarsabove No. 1 Tunnel level. One series of raises is seldom sufficient to tap all theore. If the foot-wall is flat a parallel drift in waste with ac-companying raises will have to be driven. There will also beseveral drifts between the foot and the hanging walls. At oneplace on Xo. 3 Tunnel level there are five parallel drifts now operat-ing and at least another will be required. In this case the pillarsin the stopes a
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Keywords: ., book, bookcentury1800, booksubjectmineralindustries, bookyear1895
