Transactions . to some extent used for the first stope. After thefirst lift had been excavated, eight Brown cantilevers were in-stalled for the remaining excavation. These machines beganwork about October 10, 1893, and finished November 6, 1895,working 10-hour shifts, and moving 2,084,700 cubicyards solid rock at a cost of 2 cents per cubic yard. This in-cluded only the cost of conveying the rock from the pit to thedump, and did not cover the cost of channeling, drilling, blast-ing, loading rock into the buckets or superintendence. Thecost of conveying (2 cents per cubic yard) included
Transactions . to some extent used for the first stope. After thefirst lift had been excavated, eight Brown cantilevers were in-stalled for the remaining excavation. These machines beganwork about October 10, 1893, and finished November 6, 1895,working 10-hour shifts, and moving 2,084,700 cubicyards solid rock at a cost of 2 cents per cubic yard. This in-cluded only the cost of conveying the rock from the pit to thedump, and did not cover the cost of channeling, drilling, blast-ing, loading rock into the buckets or superintendence. Thecost of conveying (2 cents per cubic yard) included the cost oflabor operating the cantilever, fuel, oil, waste and repairs. TheBrown Hoisting and Conveying Machine Co. of Cleveland,Ohio, erected and operated these machines, receiving from thecontractors 15 cents per cubic yard, which gave them a clearprofit of about 13 cents per cubic yard. One of the first Lid-gerwood cable-ways placed on the canal was on Section 11, and THE CHICAGO MAIN DRAINAGE CHANNEL. 313. VOL. XXVII.—21 314 THE CHICAGO MAIN DRAINAGE CHANNEL.
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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries
