Show MILLING PRACTICE AT THE SILVER KING A recent issue of the engineering and mining journal contains an interesting article on the milling practice at the silver king park city utah from which we quote as follows the mill at the silver king mine handles from to tons of ore per twenty four hours the ore after passing through crusher rolls and screens is jig ged so as to yield five sizes the jig product carries 48 to 50 per cent lead 60 to 70 ounces silver per ton together with 3 to 4 gold and this constitutes approximately 75 per cent of the total recovery the jig tailings are reground in huntington mills having twenty mesh screens the product going thence to a system of classifiers which size it for the tables and banners van ners on the concentrating cent rating floor are twelve wilfley tables five frue banners and four wilfley sl imers the finest material from the classifiers goes to the banners van ners the coarse to the tables the tailings from both tables and banners pass to elevators thence to screens and the oversize being re concentrated by the tables the table are likewise retreated on other tables and the table slimes are reclassified the slimes make a product that runs per cent lead 28 ounces silver and 2 gold the table product approximates 24 per cent lead 24 to 30 ounces silver and 3 gold per ton the frue vanner concentrates will run 18 per cent lead 26 ounces silver and 2 gold the muddy water or slime from jigs digs screens and other sources is collected in a series of V shaped settlers each forty feet long five feet high and five feet wide at top the heavy material setles and is then drawn off at the bottom through taps into launders that discharge into the boots of elevators the latter conveying the pulp or mud to an iron stock tank from here it is dischar discharged ged into two steel receiving tanks holding 2500 gallons each wherein the material is subject to the action of compressed air forcing it into filter presses by which the principal proportion ot of the water is squeezed out leaving the pulp in compressed circular slabs carrying from 11 to 12 per cent lead 18 to 20 ounces silver and 2 to 3 gold these filter press slabs amounting to twelve tons per day are chopped up by a specially contrived device and passed through a drier which reduces the moisture in them to about 12 per cent it is found inadvisable to reduce the moisture ture lower than this on account of the fineness of the particles there would be loss in handling if they became very dry the concentrates cen from the tables and climers are dried in the same manner but the moisture in them is reduced to 3 per cent the concentrates referred to and the slime produce recovered in the filter presses are shipped separately to the smelters shelters sm elters the mill effects a total concentration of about three tons int info 9 one this is the only mall in this district employing filter presses in the treatment of slime the wilfley slimer is in 1 n use at several mills in the district it does the work of the canvas stake with the additional advantage of its lateral motion and its slow longitudinal travel whereby a washed surface is constantly being presented for the slimes to pass over M J daly park city is general manager of both mine and mill with J W stevens as mill superintendent |