The Mother Lode region of California . reen is used in the battery, THE MOTHER LODE REGION—AMADOR COUNTY. 55 formerly 30-mesh. The amount of water employed in the battery isvariable, depending on the character of the ore. Cast-iron, chilled,manganese, chrome, and hammered steel shoes and dies have been usedin this mill. The steel shoes and dies have given the best satisfaction;the iron shoes last about 50 days, the steel 95 days, the latter crushingabout 340 tons of rock. The plates are dressed daily, and the generalclean-up is made monthly. There are 24 Frue vanners in use. Thesulphides colle
The Mother Lode region of California . reen is used in the battery, THE MOTHER LODE REGION—AMADOR COUNTY. 55 formerly 30-mesh. The amount of water employed in the battery isvariable, depending on the character of the ore. Cast-iron, chilled,manganese, chrome, and hammered steel shoes and dies have been usedin this mill. The steel shoes and dies have given the best satisfaction;the iron shoes last about 50 days, the steel 95 days, the latter crushingabout 340 tons of rock. The plates are dressed daily, and the generalclean-up is made monthly. There are 24 Frue vanners in use. Thesulphides collected on these machines are treated in the chlorinationworks at the mine, having a daily capacity of 3^ tons. The averagesaving is about 94^ per cent, and the cost is said to be $7 per ton,paying high salaries to experienced men. The mortars used in the Kennedy mill were formerly of a wide typewith double discharge, the rear discharge being closed for gold have all been replaced by narrow, lined mortars, designed by Mr-. Sketch-si7owino ^Tf^iK&of f-of{h)-AT\oH acrossHCenhepy VertiCt^l ^h-aft Fig. 10. Webb Smith, the mill foreman. The mortars are lined throughout, andhave a plate on the feed lip which may be replaced when worn. There are 150 men employed. Kennedy Mining and Milling Company of San Francisco, owners. J. F. Parks, superintendent, Kennedy Slimes- Plant.—All the tailings from the Kennedy mill go toa slimes plant, one of the first built and successfully operated on theGold Belt. The design is that of G. G. Gates of Jackson, who has car-ried the concentration of slimes to as near perfection as may be Gates has also designed an end-shake belt concentrator which doessplendid work on slimes. This machine is used in recleaning the con-centrates from the canvas tables. The Gates plant is described at lengthin Bulletin No. 6, California Mill Practices, by E. B. Preston. Sincethe publication of that bulletin, Mr. Gates has made no material changein
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