. Machinery for metalliferous mines : a practical treatise for mining engineers, metallurgists and managers of mines. of Gold, by M. Eissler. Pifth Edition. London: CrosbyLockwood & Son. 368 TEN-STAMP GOLD MILL. 169 At the mouth of the hopper or magazine an automatic feeder (e) isfixed (see also figs. 151, 152, p. 232), and this regulates the supply of theore to the stamp battery (/). The ore, after pulverisation, flows in theform of pulp or slimes through the screens in front of the stamps, andis spread in a thin sheet over the amalgamated plates (g). The free goldis caught and retained by th
. Machinery for metalliferous mines : a practical treatise for mining engineers, metallurgists and managers of mines. of Gold, by M. Eissler. Pifth Edition. London: CrosbyLockwood & Son. 368 TEN-STAMP GOLD MILL. 169 At the mouth of the hopper or magazine an automatic feeder (e) isfixed (see also figs. 151, 152, p. 232), and this regulates the supply of theore to the stamp battery (/). The ore, after pulverisation, flows in theform of pulp or slimes through the screens in front of the stamps, andis spread in a thin sheet over the amalgamated plates (g). The free goldis caught and retained by the mercury, while the sand and water areconveyed out of the mill. The amalgamated plates are of the samewidth as the mortar box, and from 6 ft. to 12 ft. long, the usual lengthbeing about 8 ft. One or more amalgamated copper plates are alsofixed inside the mortar box, and small quantities of mercury areoccasionally dropped into the mortar while the stamps are running. Thefree gold is thus caught both inside and outside of the battery, and asit accumulates in the form of amalgam it is scraped off and Fig. 247.—General Arrangement of a Gold Mill. The Stamps are usually fixed in one long row, so that the illustrationwill equally apply to a battery of 10 or 100 stamps. When Huntington mills, or other special forms of pulverisers are used,they are fixed in the same position as that occupied by the stamps, andare followed by amalgamated plates. The motive power may be eithersteam, water, or electricity, and is applied to the main driving shaft {/i). This process of milling is one of the cheapest possible, and in largemills will not cost more than i6s., or say 60 cents per ton of ore ; sothat ore of a value of i6s., or say, $4 can be mined and milled to aprofit, while under exceptionally favourable circumstances, with water-power and large masses of ore, a profit can be made out of mineralworth only 4^-. per ton. There are, however, but very few cases in which the ore is s
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