. Extraction de pelles à vapeur, y compris une considération de pelles électriques et d'autres pelles hydrauliques dans l'exploitation minière à ciel ouvert . 7.5cents la tonne est facturé pour le rachat de stripping prépayé.Chino Copper Company, Santa Rita, Nouveau-Mexique Cu. vd. Surcoût par tonne de minerai coût par année charge enlevée cu. Yd. Enlevé tonne 1911 et précédent 2,000,000 0.3168 600,000 $ + 0.15 $ + 1912 2,223,678 0 2761 l,:36l,463 0.1652 1913 3,082,174 0.3343 1,976,572 0.2313 1914 3,173,717 0 3347 2,114,910 0.2213 1915 3,133,916 0.3428 2,600,271 0.1947 1916 3,564,623 0.3882 3,216,065 0.1988 1917 3,712,414 0.3710 3,607,825 0.41 + 1918

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. Steam shovel mining, including a consideration of electric shovels and other power excavators in open-pit mining . 7.5cents per ton is charged for redemption of prepaid stripping.Chino 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 $0.3168 600, 000 + $0.15 + 1912 2, 223, 678 0 2761 l, :36l, 463 0.1652 1913 3, 082, 174 0.3343 1, 976, 572 0.2313 1914 3, 173, 717 0 3347 2, 114, 910 0.2213 1915 3, 133, 916 0.3428 2, 600, 271 0.1947 1916 3, 564, 623 0.3882 3, 216, 065 0.1988 1917 3, 712, 414 0.3710 3, 607, 825 0.41 + 1918 3, 264, 556 0.51 + 3, 749, 238 0.51 + 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. 0.75cts 0.80 0.25 4.25 4.25 0.25cts 0.20 1.50 2.25 2.50 l.OOcts 1.00 1.75 6.50 6.75 lO.SOcts 6.70cts 17.00cts2.50 19.50cts Stripping cost per cu. yd. in place. Total Drilling.Blasting.Loading.Hauling. Administration Total cost per cu. yd l.SOcts 4.0011.2013.00 30.005.00 35.00 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 shovels.Furthermore 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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