Bisbee daily review., 1914-02-22
PLANT DESCRIBED IN COMPREHENSIVE MANNER
 FOLLOWING INSPECTION VISITS BY GEO. 4. NEWE1T

Caring for Precious Metal Content
 The fourth floor of the sampling and testing room. which is the lower one, by the way, is made very tight. so that there can be no loss through es- cape of dust particles. The greatest care Is taken to have 1t so there can be no loss of values.
 A Flexible Arrangement
 This mill Is a double one. One side may be operated to the exclusion of the other. so that in case of accident to one portion the other will carry on the work effectively and without inter ruption. Either side is of ample ca. pacity to care for the needs of the smelter when running at its maximum capacity The mill is 40x4S feet, five stories in height.
 The Mixing Beds.
 From the mill the ores are con veyed by belts to the mixing beds. the latter consisting of six beds. three for coarse and three for fines. Located centrally between them is a coke bed. The combined capacity of these beds is about 3O0O0 tons of ore. The ore is reclaimed from these beds by electrically operated drags having steel teeth on the upper portion and a gang of blows on the bottom. The gang Is dragged across the face of one end of the bed. the teeth raking the ore. bringing it down to the blows which convey it to a belt running par allel to the side of the bed. The blows are handled by continuous belt. bringing them under the bed and again into, delivering position after they have placed ther loads on the belt This raking down of the ores across the bedding charges has the result of mixing them properly, and gives an altogether better placing than could be secured by hand. while at the same time 1t does the work much more rapidly and for less ex- pense. The system is identical in all respects to that employed at Greene Cananea, and is being adopted by nearly all the smelters with modern plants.
 It is obvious that no ores can be deposited on the beds while the re- claimed is at work. The bed is first filled up to capacity and then the re- claimed is put into action. While the material Is being taken. other beds will be built up so that there is all ways two beds from which ores are being reclaimed and four that may be undergoing restocking. In the case of Calumet & Arizona the beds have not as yet reached their capacity as the work of stocking has been going on only a short time and the shelter has been taking ores as fast as they come from the mines. Better re- suits will be obtained when the beds have been brought up to their full heights The coke is handled by end less belts automatically to the storage bins or to blast furnaces. and the coarse ores go by belt up the same incline to the charging hoppers at the blast furnaces.
 The Fines Are calcined.
 The fines are automatically handled by belts to twelve Hereshoff coasters, these being 211a foot. with round tur- rets Blasts used to be sent through the top and arms of these but now the tops are covered completely. the hlast going from the center directly into the roaster. which has been at. tended with excellent results. No fuel or oil is now needed in these roasters they working perfectly with out. There are the usual superim- posed hearths with blows mechanical- ly operated to rabble the ores. and arms mechanically actuated to bring in ores from the feed sources. Each of these roasters at the time of our visit were handling about SO tons per day and ten of the twelve of the plant were in operation.
 Collecting the Dust.
 A huge dust chamber 6Ox14O feet and 70 feet high. brlck-lined. collects nnv dust that may be on the way to the big steel hue, a stack with 20-foot bore ana rising to a height of 279 feet This fue chamber is we'll baf' aed. and has thousands of lines of wire strung through 1t in addition to lnnumerable steel bands It is high ly efficient. and at that the amount of dust obtained is not large.
 Heat Units Are Taken Advantage Of.
 The calcines are taken red hot from the roasters to the reverberatory fur nsces. the latter being located close hy with the idea of losing the mini mum fo time between these two points. The more heat that can be conserved the betters for the reverbs, as it increases the efficiency of the latter. There is quick handling by cars of the calcines, the railway tracks running over the reverbera' tories.
 Advsntsoe of a Level Location.
 MT Greenwav and his skilled as' sociates saw the advantage of level riece Of land upon which to build the nlani. II used to he the practice to build smelter agaipst some high hill. We observed this at Nthd big Washoe shelter, at Anaconda. Montana, as well as at other points. The bad fea- ture of the elevated location was that all work stopped when. the hill was roo.I,o1 The bt0 atark grrnOnu Qb