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s .. _.. __'_. .. <br />system owned bg this company and which derives its supply from <br />~_____ _. I - . <br />_= ... _ <br />-='- <br />I' I Pack Creek and which also furnished the water supply of the <br />I fawn of Gilman <br />MILLING METHODS. <br />The are coming Pram the mine which averay_.es about 18~ <br />zinc, passes through a 18"x 36" roll Prom which an elevatar <br />takes it to a slotted metal screen Pram which the fines ga to <br />raaeter bins and the over size to a 18" x ~6" fine roll, thence <br />to a screen again and ea on untill ell pees a 1/18 inoh slotted <br />~, metal screen and is sent to the bins aver the roasters. The <br />i <br />i bins at the head 8f the mill held 700 tans and the bin aver the <br />i <br />raeaters hold 126 tans. Fram the are bin aver the roasters <br />the era is carried on a traveling belt to the furnace hoppers <br />', from,whiah it le fed by plunger feeders into the furnaces. <br />The Dewey Furnaces which are Ehree in number are circular in <br />arses section, are 14 feet is diameter and 18 feet high. They <br />~ are divided into six docks with rabbles on each desk and with <br />• ail burners on the bottom and third froel'-the bottom desks. The <br />raiebles are driven by the main lino shaft of the mill and the <br />ore feeds through the center of one deck and Pram the outer <br />!, edp_,e of the next, through center of next and so on through the <br />furnace. The roast le kept at 640 degrees to 660 degxeae. <br />From the roasters the ore le elevated and passes over <br />e 1/2 lnoh careen the fines from which go to the ooolors and <br />anything not passing through $he soreen is discarded. <br />The coolers 3 in number have an annular compartment, <br />; 7.nto thboh the ore is fed, betwoan two shoat iron oylindare, <br />whioh revolve about a ooromon axle and have the speao babwoon them <br />closed at one and and open at the other enfl, and whore it dis- <br />charges to a warm xhtoh in turn feeds the era an a oonveyor <br />'bolt whioh oarriee it to .an elevator, when it la elevated to <br />'the hoppers over the map~etio soporators. Tha coolers are <br />16 feet in,length, the outer oylinflor which has water sprayed <br />~iupon it from the outaida is 3 fast in diameter, while the inner <br />oylindor, whioh has water opraysd upon it from tlCbhin is but <br />Ida foot in diameter. <br />The ore then passes to the oleatrioal aeporetors where <br />38~ 31nk Concentrate is made, a roifldling and a tailing <br />,._, , <br />11f <br />