Modern American Methods of Copper Smelting

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Scientific publishing Company, 1887 - Copper - 342 pages
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Page 17 - Six months' constant experience with this sampler has shown that 10 per cent, of 20 per cent., or 2 per cent, of the original...
Page 203 - In the same year Messrs. Nitze and Wilkens published, in the Transactions of the American Institute of Mining Engineers, Vol. XXV, a paper on ' ' The present condition of gold mining in the southern Appalachians.
Page 18 - ... though in exceptional cases, 15 per cent, of 30 per cent., or 4^ per cent, of the ore may be required.
Page 327 - ASSAY FURNACES. Awarded the Highest and only MEDAL at World's Fair for Hydrocarbon Blowpipes and Assay Furnaces. No Dust. No Ashes. Cheap, Effective, Economical, Portable, and Automatic. SEND FOR CIRCULAR AND PRICE IJ8T TO W, HOSKINS, 81 South Clark St., Room 55, CHICAGO, ILL Incorporated 18G8.
Page 133 - ... to the first 16 ft. ; an increase to 15 per cent will be sufficient, however, to heat a second hearth, while a 20 per cent sulphur-ore will work rapidly in a three-hearth furnace. The addition of a fourth hearth is rendered justifiable by the increase of the average sulphur contents to 25 per cent. As there seems to be almost no limit to the extent of surface over which the requisite temperature may be obtained in the calcination of highly sulphureted ores, much longer furnaces have been used,...
Page 273 - For smelting ore the cupola is specially advantageous — " 1. With highly ferruginous ores. " 2. Where the cost of anthracite, coke, or charcoal is not excessively greater than that of bituminous coal, wood, and other fuels fitted for the reverberatory only. " 3. For oxidised ores. " 4. For low-grade native copper. " •>. Where, as in the case of lean ores, clean slags are a necessity.

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