Principles of mining : valuation, organization and administration; copper, gold, lead, silver, tin and zinc . Fig. 42. — Longitudinal section of Figure 41. A form of temporaiy ore-pillars in veiy wide deposits ismade use of in conjunction with both filling and timbering(Figs. 37, 39, 40). In the use of temporary pillars for ore-bodies PRINCIPLES OF MINING. 100 to 250 feet wide at Broken Hill, stopes are carried up atright angles to the strike, each fifty feet wide and clear across theore-body (Figs. 41 and 42). A solid pillar of the same widthis left in the first instance between adjacent
Principles of mining : valuation, organization and administration; copper, gold, lead, silver, tin and zinc . Fig. 42. — Longitudinal section of Figure 41. A form of temporaiy ore-pillars in veiy wide deposits ismade use of in conjunction with both filling and timbering(Figs. 37, 39, 40). In the use of temporary pillars for ore-bodies PRINCIPLES OF MINING. 100 to 250 feet wide at Broken Hill, stopes are carried up atright angles to the strike, each fifty feet wide and clear across theore-body (Figs. 41 and 42). A solid pillar of the same widthis left in the first instance between adjacent stopes, and theinitial series of stopes are walled with one square-set on the sides.
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Keywords: ., bookcentury1900, bookdecade1900, bookpublishernewyorkmcgrawhillb
