Bulletin . arge size classifier similar to the Akins. TheAkins is mentioned here as it is simple and would not require anyextensive changes m the arrangement of the mill as far as headroomis concerned nor loss in drop from the dirt or feed trommel to therougher jig. The cost of this deshming screen would be about $1,000installed. The Woodbury deshmmg jig might be used to good jig would deslime the feed and also eliminate a large proportionof the lead muieral, thus permitting the rougher jig to do more efficientwork on the remaining zinc ore. Such a jig would increase the effi-ci
Bulletin . arge size classifier similar to the Akins. TheAkins is mentioned here as it is simple and would not require anyextensive changes m the arrangement of the mill as far as headroomis concerned nor loss in drop from the dirt or feed trommel to therougher jig. The cost of this deshming screen would be about $1,000installed. The Woodbury deshmmg jig might be used to good jig would deslime the feed and also eliminate a large proportionof the lead muieral, thus permitting the rougher jig to do more efficientwork on the remaining zinc ore. Such a jig would increase the effi-ciency of the roughing system, but the first cost would be higherthan for any of the other devices mentioned, and in most miUs moreheadroom would be needed and the feed trommels and feed elevatorswould have to be rearranged. DESLIMING AT SECOND OR THIRD CELL OF ROUGHER JIG. Instead ol desliming at the head of the rougher jig a means has beendevised for desliming the material after it has reached the second or. 70 MINING AND MILLING OF LEAD AND ZINC ORES. third cell of the jig (see fig. 10). A wooden baffle is fastened to theends of two strips of wood, the opposite ends of which are pivoted tothe inner sides of a jig cell. This baffle is placed at right anglesto the flow and adjusted to move up and do\ with the pulsatingaction of the plungers while resting On top of the bed, the water andshmes being removed just before they flow over the partition betweenthe cells. The sHmes and top water are diverted off the bed at theplunger side of the jig and by means of a laimder conveyed to settUngtanks; the gangue and remaining ore pass mider the baflje into thenext cell. Xot only is a large proportion of sMmes and excessive top water removed by hav-ing these baffles at one ormore cells, but the speed ofthe surface currents or topwater is reduced, thus pro-viding a steadier dischargewith less disturbance of thebed at the head of each suc- FiGUKE 10.—De^-ice used for desUming top water on
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectminesandmineralresou
