. Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics . and ore were mixed befoi-e crushing. The cost in one of the three mills belonging to the company was but $, the averagebeing raised by the other two. 522 MILLS, SILVER. The cost of milling at the works of the (amalgamation) Elkhorn Mining Co., Elkhorn, Jef-ferson County, Montana, in 18U0, was | per ton, divided as follows: Superintendence, ; engineer, 26-41; crusher-man, 19-74 ; drier-men, 19-i).5
. Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics . and ore were mixed befoi-e crushing. The cost in one of the three mills belonging to the company was but $, the averagebeing raised by the other two. 522 MILLS, SILVER. The cost of milling at the works of the (amalgamation) Elkhorn Mining Co., Elkhorn, Jef-ferson County, Montana, in 18U0, was | per ton, divided as follows: Superintendence, ; engineer, 26-41; crusher-man, 19-74 ; drier-men, 19-i).5 ; battery-men. 25-85: roaster-men, 23-24; cooling-floor men, 19-25; car-men, 37-52; amalgamators, 25-99; pan-helper,laborer, 02-49 ; melter, 01-90 ; assayer (proportion), 09-78 ; storekeeper, 05-59; repairs, 05-32 ;mechanics (proportion), 27-54; millwright, ; teams and laborers. 32-18; watchman,09-99; tailings, storage, 01-71; office (proportion). 08-25; chemicals. 10-04; lubricants, 05-79;illnminants, 01-24 ; quicksilver, 29-56; salt, 173-22; fuel, 165-70; freights, 11-80; castings,48-33; other supplies, 15-14; general expense, 37-17; total, 873-01. The amount of ore. Fio. 2.—Hofmanns 50-ton lixiviation-niill. crushed was 9,163 tons ; amount of salt used, 990 tons; average assay of ore, 455 oz. silver;average assay of tailing, 6 oz. ; percentage of silver saved, 86-83. The Ontario and Daly mills, at Park City, Ltah, furnish an interesting comparison, as atthe former the ore is worked by amalgamation and at the latter by the Russell process of lix-iviation, the ores being very similar in character. The cost per ton at the Ontario in 1890was $, 24,450 tons of ore being reduced. The average assay of the ore was 44-96 oz. silverper ton; average assay of tailings. 4-45 oz. per ton; percentage of sUver saved, 90-03. Inthe same year 20,795 tons of ore were milled by the Daly Mining Co., at an expense of $ ton, 88-77 per cent of the silver being saved. Mr. W. A. Wils
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Keywords: ., bookcentury1800, bookdecade189, booksubjectmechanicalengineering
