. Steam shovel mining, including a consideration of electric shovels and other power excavators in open-pit mining . erating officials and to the crews. Suchrepresentation is more easily understood than lists of figures bythese men, and it is always to be encouraged. Auditing is amatter of past history, but when the results are clearly presentedand can be followed from day to day, there is sure to be developedan incentive for improvement. In addition to production andservice records, some empirical cost graphs were worked out^for the Nevada Consolidated to show the effect of varying dailyprodu
. Steam shovel mining, including a consideration of electric shovels and other power excavators in open-pit mining . erating officials and to the crews. Suchrepresentation is more easily understood than lists of figures bythese men, and it is always to be encouraged. Auditing is amatter of past history, but when the results are clearly presentedand can be followed from day to day, there is sure to be developedan incentive for improvement. In addition to production andservice records, some empirical cost graphs were worked out^for the Nevada Consolidated to show the effect of varying dailyproduction on cost. Figs. 52, 53, 54 and 55 illustrate the method,and by the use of such charts a daily unit cost of productioncan be figured to a fraction of a cent. The operating costs areclassified under indirect or overhead expense, shovel-operatingexpense and locomotive-operating expense. To illustrate the useof the charts assume that six shovels, each operating two shifts,handle in 24 hr. a total of 12,000 cu. yd. of material, or an aver- 1 J. M. Anderson, E. & M. J., Jan. 27, 1917. COST OF SHOVEL WORK 229. LOCOMOTIVE LABOR FUEL SUPPLIES & PEPAIR5 VARD CREW EXPENSE TRACK MAINTENANCE PlG. 52.—Steam shovel cost distribution chart.
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Keywords: ., bookcentury1900, bookdecade1920, bookpublishernewyo, bookyear1920
