. Machinery for metalliferous mines : a practical treatise for mining engineers, metallurgists and managers of mines. tration, once the machinery is erected, isnot great, nor do the machines absorb much power, as will be seenfrom the separate descriptions given of those usually employed. The concentrates obtained may either be sold as such, or undergothe further processes of roasting and chlorination, or treatment by thecyanide method, for the purpose of obtaining the gold in a metallic state,on the mine itself, according to the local facilities. Most of the ores of gold contain a certain amou
. Machinery for metalliferous mines : a practical treatise for mining engineers, metallurgists and managers of mines. tration, once the machinery is erected, isnot great, nor do the machines absorb much power, as will be seenfrom the separate descriptions given of those usually employed. The concentrates obtained may either be sold as such, or undergothe further processes of roasting and chlorination, or treatment by thecyanide method, for the purpose of obtaining the gold in a metallic state,on the mine itself, according to the local facilities. Most of the ores of gold contain a certain amount of silver which,in the case of free milling ores, is recovered with the gold in the con-centrations, and can be extracted equally well, either by melting orpan amalgamation, or by some modifications and additions to thechlorination process. Where the amount of silver is considerable theore should be classed as silver milling and be treated as such, as describedon page 379. Gold Mill with Concentrators.—The general arrangement of agold mill with concentrating machines is shown in figs. 248 and 249 (Plate w V.
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