The book The Selling of Copper 1916 17 was written by author Henricus Johannus Stander Here you can read free online of The Selling of Copper 1916 17 book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is The Selling of Copper 1916 17 a good or bad book?
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Thus, in the flat schedule the only thing considered is the percentage of metal in the ore, whereas the neutral schedule considers, besides this, the composition of the ore. The smelting charges on high-grade ores are higher than those on the low-grade ores, when one considers the relative tonnage of each class. The smelting charges on low-grade ores are not much over the actual cost in fact, in some cases, they are below actual cost. If, now, an average smelting rate had to be adopted, it woul...d make it almost impossible to work very low-grade ores, and thus the sliding scale is the customary system used, because in such a case a low-grade ore can be worked much more profitably than when a melting charge, irrespective of the metal content, be imposed. One must, however, not forget that an increase in the metal content, means less gangue to be fluxed and the smelting operation then becomes cheaper. Thus, the smelter charges will decrease as the metal content increases, in the case of copper and lead ores, whereas this is not true to the same extent when the value of the ore is largely in gold.
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