Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics (1892)
Benjamin, Park, 1849-1922 · New York, D. Appleton · leaf 616
in Professor Monroes opinion, fromthe St. Joseph figures. The St. Joseph ore is galena with a magnesian limestone gangue,assaying from 75 per cent, to 8 percent, lead. The capacity of the mill is 800 tons perday. The loss in tailings amounted to 274 per cent, of the mineral. At the Hecla… … Fig. 1.—Eotary picking table. lead and 37^ per cent, of the silver being saved. The average cost of dressing low-grade ore in the silver-mining districts of the Rocky Mountains, in small mills, say of 100 tons per day capacity, is probably between 75 cents and $1 per ton. Picking Tables.—In ore…
Mechanical engineering
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