. Steam shovel mining, including a consideration of electric shovels and other power excavators in open-pit mining . und mining. Conclusion and Remarks.—In consideration of the foregoingestimates, shovel work would probably be recommended, foralthough much more initial capital is required and a longer timewill elapse before arriving at full production, the open-pitmethod will yield larger profits, (even omitting the doubtful 208 STEAM SHOVEL MINING carbonate and low grade sulphide material), have greaterflexibility of output, deliver a cleaner product, give a higherpercentage of the tonnage ex
. Steam shovel mining, including a consideration of electric shovels and other power excavators in open-pit mining . und mining. Conclusion and Remarks.—In consideration of the foregoingestimates, shovel work would probably be recommended, foralthough much more initial capital is required and a longer timewill elapse before arriving at full production, the open-pitmethod will yield larger profits, (even omitting the doubtful 208 STEAM SHOVEL MINING carbonate and low grade sulphide material), have greaterflexibility of output, deliver a cleaner product, give a higherpercentage of the tonnage expectancy and be subject to ratherbetter labor conditions. The shovel work is more comprehensiveand there is more assurance of the correctness of the is evident that the work is of sufficient magnitude to fullyjustify shovel methods, notwithstanding the attendant heavyinitial expenditure. Although the example chosen is one of a low-grade copperore, any other class of deposit, such as a body of iron ore, or acoal bed or vein, may, with individual modifications, be workedout in much the same A rea Ore 100 x ZOO = 20,000 5q Ft 10- Sfs:350X350122,500 ^=6IZ\ D :Z50xZ00- 50,000 ^ZSo] Fig. 46. It is interesting to note that a different conclusion mighthave been reached had the ratio of overburden to ore been lessfavorable—say, 2\^ cu. yd. per ton of ore—or had some of theother factors been less favorable to pit-mining. Briefly, suchchanges will be further illustrated. The foregoing example may be considered as a borderlineproposition, and it was especially chosen as such because in itcould be brought out most of the factors that must eventuallybe considered in the solution of such a mining problem. Manyproblems can at the outset be quite obviously classified as under-ground or shovel propositions, and can be more quickly solved,since many of the minor details may be omitted. To emphasize this, suppose that this deposit had coveredabout the same area an
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