The copper era., 1904-05-26

Press
 The Eigby NJ. * F. Cos plant
 Meyer, now being erected, is intend
 to treat all classes Of ore by {
 P0hle-Croa>dale process, owned
 The NetfL IT. .tilization Co.
 -eor the union high SCI. plant by the Santa Fe, Prescott & Phoenix Railway Co. over d spur 5000 feet long from their main track 10 the
 Rigby Co.'S. works. weighed and drop ped onto ;hc unloading track in front of the sampler, where it is shOveled into the ore chute feeding the crushcr sampler, this being the only time the ore is handled by shOvelS. The ore from the cars going to @ 20xlO-inch Blake cru7her, thence to an elevator,
 ;"h delivers it 10 q fmc7h screen. the finished product going to a dodble Vczin automatic sampling machine. over- izc returning tO 36sl4-inch rolls, which discharge into the same cle- vaior d. the cru~hcr. The sample from the sampler goes tO the sample bin on the cutting floor. where 1t fol- lows the usual custom in making q sample for control and umpire assays. The reject from the sampler is taken by IG inch belt cOnvcvOr and dumped iutoo of the ore bins adjoining the west end o' the sampler building which have capacity of 70 tons. From them the ore is drawn into car, and taken to the dryer building, j6x30 feet, where it ie fed bv automatic feeders into two revolving dryers. From the dryers the ore k dumped through brick chute into ear and taken to the fine crushing building. 5Gs;O feet. where it is crushed to the required fincuc-s by three pairs Of 3ON Nll-inch rolls, the finished product being taken from the screens to the pulp ore bin b. a lG-;nch belt con- vcyor. In this building the salt used in the process is crushed by a pair of 20NI2-inch rolls Co the same fneness as 1hr o-e and it is taken by ear to the salt bin, aG jicent To the pulp ore bin. Besides the rolls. scrcu-. elevators and convcyors in this building, there are three dust collector, and fans and four feed hoppcr5. with feed screws, feeding elevators and rolls.
 The ore and salt from the fine crush ing buildins goes orhc pulp ore and salt bins in the mixer building. through the couvcyor building, 2SNN feet. The mi <e' building, west of the fine crushing building, is 64Xl4 feet. There is hopper scale under the pulp ore bin. another under the salt bin, from which charges ..re run onto Il It. inch belt couvcNor. which cdv"ie> them To the receiving hoppcr oyer the mixer. and from which it ie dis charged into 5-tou box mixer. when after mi .inL it i- dumped into a etor a.r hopper under the mixer, from which it k drawn d. uecGrd into a ear and taken to tho furnace feed hopper-, through d tram house. looNN feet. one story high
 The furnace building k li2NSe feet. ! lll IT are ltltll 'tN NtitN 'Us iil tR N ilf'I furnaces, feet q inches at the large . end. .I-fcet ii inches at the small end. 1, and 36 feet long. From the feed !. hopper of the furnace the ore i~ fed ! into the furnacn hy screw feed, , the roasting process b'inG continuous . similar to the operation ol d White ! Howell furnace, The taiiIn@, from . the furnaces are automatically con . and taken to the dump in them. The fGcl used k Cali ornia crude oil. The 1 ore having beeu mixed with the proper amount Of salt and sulphur be- permits ot double decomposition, by which the metal values are converted ' into chlo"ides. volatile at the roasting | heat. and the sulphur into sulphate of soda. The chlorine fumes are drawn from the furna ccs by lead-lincd press ure blowers. through Il series oi cham bers and lues into the fluc house. building l0Ox3l feet 6 inches. from there into the condenser building. 96N44 feet, passing through q cooling tower which contains gravel filters kept wet by constant sprays of water. This cools the fumes passing into the pressure blowers and the Innings are not injured by heat. From the blow CTS the fumes are forced into con- densers and through the diaphrams