Weekly Arizona journal-miner., 1907-07-31
LAWSON OWNS SHELTER

trausmission, iS stepped down 70 lfp volts at the Blue Bell transforming station before delivery k made iO the towering motors. In only one instance is other than the alternating current used about the plant. this being the TO- tary 2j horse power motor which pow CTS the cranes in the converter room.
 The four Stirling boilers, housed to. gcthcr with tine engines in n steel framed, brick.wallcd building. are of tubular type and an aggregate horse power of loo. They are fired by waste heat from the rcvcrbcratorics, but crude oil may bc used if necessary.
 The sampling works having a 2i. hour capacity for 1000 tons of ore are very conveniently located in refer. ence to the receiving bins, conccn,rat. ing and smelling works. The equip. mcnt comprises crushcrs. coarse and fine rolls and two spccially-dcsigned double sampling Vczin samplers. Two 50.horsc power and four 2j.horsc power motors power the machinery. which mas been arranged and set up with close re. gard for accurate. automatic and rapid sampling.
 The concentrating plant of loo tons capacity. located near the sampling works. is built in units of 200 tons. It's equipment comprises rolls, jigs, Hunt. ington rcgriuding mills, tables an1 sinners. It is designed especially for handling the highlysilccous copper. iron sulphidc ores of the Blue Bell and Bradshaw mines. Special attention has been given to the towering of the machines and the preservation of the water for reuse. In it's towering the mill is divided into three sections for each 20O.ton unit, one 75.horsc power motor towering the crushcrs, rolls and elevators, one 50.horse power motor driving the jigs. IIuntingtons and cen trifugal pumps. and n third motor of 25-horsc power operating the tables sinners and smaller pumps.
 All the buildings at the works ar, framed with structural steel, wallc, with brick or corrugated iron shcctinl and noorcd with cement. There is q complete water system for fire protec ton, as well as an adequate electric light plant, machine and blacksmith shop and fully equipped laboratory
 The four miles of yard trackngc which is of standard gauge, with @ pound rails, permits of most facil' delivery of ores and other material {, all parts of the works. Tcn.ton hopper bot,omed steel ears, electrically opcr atcd, are used throughout, and speciall, designed motor.driven sealed ears ar, used as locomotives. These sealed ears of l0.tons capacity, are provided witl six-beam Howe scales, by means o which the ore and Aux as drawn iron the storage bins are weighed for charge. They are powered by two 25 horse power motors, to which is attach ed an ordinary street ear controller.
 Ore, as received in railroad cars m, weighed, is placed in hopper-bottome' receiving bins, ten in number, an' each of a capacity of 90 tons. Fron the bottom of these bins discharge O the ore is made upon l2-inch bel conveyer 325 feet in length, by whicl delivery is made to the hopper bin resting above the crushers in the sam bling house. Ten cars of orc may b. unloaded at one and the same time. B means of lever-operated gates dis charge of ore upon the conveyer bel may Do made from any one or all O the receiving bins at one time, and tn unloading of the ore from the railroa' ears may be carried on uninterruptedly
 Delivery of the ore from the storag bins is made to either the roastin furnaces or reverberators as the cas- may be. It is estimated that fully 5' per cent of the copper ores received n the plant require roasting before thei delivery to the smelting furnaces.
 The calcine cars, of lotion capacity receiving tine ore as mechanically dis charged from the Edwards roasters are taken to the reverberatories by tn previously mentioned motor-drive, scale cars. The ladies into which i laundered the matte, are carried to tn converters by the 40.ton electric crane
 An important feature of this plan is the system adopted for the mechan ical handling of the material through out, whereby operating smelting cx pcnses may be reduced to the mini mum.