. Steam shovel mining, including a consideration of electric shovels and other power excavators in open-pit mining . per ton is charged for redemption of prepaid Copper Company, Santa Rita, New Mexico Cu. vd. over- Cost per Tons ore Cost per Year burden removed cu. yd. removed ton 1911 and previous 2,000,000 $ 600,000 + $ + 1912 2,223,678 0 2761 l,:36l,463 1913 3,082,174 1,976,572 1914 3,173,717 0 3347 2,114,910 1915 3,133,916 2,600,271 1916 3,564,623 3,216,065 1917 3,712,414 3,607,825 + 1918
. Steam shovel mining, including a consideration of electric shovels and other power excavators in open-pit mining . per ton is charged for redemption of prepaid Copper Company, Santa Rita, New Mexico Cu. vd. over- Cost per Tons ore Cost per Year burden removed cu. yd. removed ton 1911 and previous 2,000,000 $ 600,000 + $ + 1912 2,223,678 0 2761 l,:36l,463 1913 3,082,174 1,976,572 1914 3,173,717 0 3347 2,114,910 1915 3,133,916 2,600,271 1916 3,564,623 3,216,065 1917 3,712,414 3,607,825 + 1918 3,264,556 + 3,749,238 + 222 STEAM SHOVEL MINING Totals to Jan. 1, 1919: 23,863,755 cu. yd. of waste and18,943,755 tons of ore have been removed. The costs for 1915 may be analyzed about as follows: Mining cost per ton Labor Supplies Total Crushing at mine {^i of ore). Drilling Blasting Hauling Loading Administration. Total mining cost per ton. Stripping cost per cu. yd. in place. Total Administration Total cost per cu. yd cts Under the cost of overburden are included all charges to wastedumps. Under the cost of ore are included a proper apportionment offixed and general charges of all kinds. The high costs in 1913 and1914 were due largely to the limited areas and inconvenient orintermittent way in which the ore shovels had to operate. Theyhad to avoid interference with the stripping shovels, and thestandard railroad ore car service was not as steady or effective aswas the dump car service supplying the stripping the ore shovels were often held up awaiting thebreaking of large pieces so that oversize material would not be COST OF SHOVEL WORK 223 delivered to the mill. The stripping shovels often avoidedmuch of this delay. Larger working areas and the inst
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Keywords: ., bookcentury1900, bookdecade1920, bookpublishernewyo, bookyear1920
