pro?le 73 Zanesville, Ohio Sidwell Materials of Zanesville, Ohio, was brimming with optimism as it opened a new limestone deep mine, creating four entrances that would result in at least 15 headings.It was expected that the mine ultimately would be about two miles deep and about a quarter mile wide, capable of yielding over a half-million tons of limestone every year for the next 30 to 40 years.T o optimize the yield and maintain productivity, th

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