Arizona republican., 1901-06-22
: Mines and Minerals of Arizona :

in the gulch which is not 400 feet wide the diiflcult can be readily under stood. The smeltsr Is built upon the old dump which was smoothed off ard fitted up for this purpose. and allows at the most a strip some goo feet wide and 500 feet long for the operations of the smeit machine shops, assay of flee and Czar shaft with its timber mill
 The heaviest and purest sulphide ores are not allowed to go into the fur nace- but are treated directly in the roast IFS. These are two immense re- volving cylindrical ovens set on a slight incline so that one md will be slightly elevated over the other. After the furnace Is OnCa started 1t dep, nds wholly upon the sulphur in the ore for it's fu-l. The ore ia fed into the uprcr end through chute and, igniting, 1t roll. around in the revolving cylinder gradually working it's way toward tine outlet at the lower end, The whole is sn adjusted that the time required in the course of any parcel If ore through the furnace is sufficient for it's comp :" roasting and it comes out nearly 90 per "ent puGe. This is -uch percentage oI purity that the blades of the .iovels us d !n is handling are all ma ie of copper, as steel shovels would ta at tackled and eaten up in short ordcc by the product. This product of the roaster5 Is fed dirertl,' into the con- verteis. An experiment is being tried to determine whether it l. cheaper 70 zee the roasters or to roast the ore in Hes in tEe open air. Considering :hc the roasters give minimum waste, I"'rLire little atteTtion and allow or the gr atest ea-e in handling these heavy sulphiaes 1t r. believed that in ,ne !ong run the machine method win prov most satisfactory. The smoke from ,dr i1p foot stack Of the coasters is nearly pure SO2 and f" the greatest source of annoyance to tha town,
 The ore from the different shafts Is dumped into large bins at each shaft house. The iron ore and suiphide. are pt separate and lowered through ohutes into the large ore dump cars. six cars make tId!n load which is made up of one ar of sulphides to five of iron ore. At the smelter are larger binc which re i've the pl Oduct Of Inc four hafts. Here there are five Nit hot -blalt economic furnaces. which handle all the goods. They are tended lach day by six feeders. two to each shaft, who feed the ore into them in the right proportions and at proper in, rva's. Besides the-a th re are men below who attend to the rupply of air and other adjustment7 so that the fur mace. vii not freeze up. ana who reg ulate the flow of the matte and slag into the pots. These, with the neces- sary quaatty of Mexican labor to whael in the supply of fuel and ore. make up a fur1age gang.
 X charge consists of 2C0 pounds of coke to every 1,sO0 pounds of ore and from 2c0 to 225 charge are fed into each furnace in twenty-four hours. The ore i-' fad into the furnaces at the same r1'io az Il Is mined. that is. one part of sulphide to five parts of iron ore, and the coke is added to each charge as above.
 Each furnace has a separate high pre- sur air compressor, operated from the engine room. whi h .Ipplies the blast, and it's r-ack is connected to the five foot cast iron .inclire stack which carries the fumes to the exit chamber far uo the hil s,de.
 Oftentimes certain portions of the -laC will run high in copper so it i-, again collected and run through the turnaee a second time. The matte ard slag run from the lower part of the fur mace through a clay lined iron sluice into large receiving pot. Here the matte, rich in heavy natal. settles to the bottom and the lighter slag rises to the top and runs off through an over How into the dumping pots which run on narrow gauge railroad and are hauled out to the dump by a dummy engine The dump which is now in uaa is only two months old and I am in formed that the intention is to work it until solid enough for heavy trains, when the broad gauge road to the bins oe the Spray and Lowell shafts will Je moved and run over this dump. giving level road bed Instead of the steep incline now used.
 Between the furnace and converter pit the distance is some thirty feet ard overhead along this. way are two trav- cling hosting carriages. These operate by electricity and run on two heavy st el tra aks some thirty feet apart and supported on a framework of steel. The carriages move along the track and carry large dNums which uoves hack end forth along the carriage