Bisbee daily review., 1914-02-22

change in former smelling methods in the mines reached deeper levels sul. phides were tho preponderate ton nages extracted. and there were ele- ments encountered that necessitated a order 10 secure the best possible re- suits Besides. the old shelter had been in constant operation for more than a dozen years and the life Of d plant Of this kind can be set down as about that length of time. Figur. ing everything. the old plant, even had 1t not been changed in construc. tion. would have been replaced with new material in this period And much is learned in new ways in a | dozen years. The splendid new smeltery of Calumet & Arizona of today may look altogether different , in ten years hence The old plant was inadequate for the needs of the company. and was too expensive to maintain. although it did high-grade work considering its facilities. It was well handled. James Wood being a | skilled smelterman wno never failed | to extract the most that could be had from the ores delivered to him. He has retired to take life easy in Cali forniG, and has well earned the rest ho is now enjoying.
 Ready Handling of Material. Iron Ore has in previous issues printed complete descriptions of the new shelter. giving dimensions. com position, etc. Everything has been planned with especial reference tc the ready and cheap handling and manipulation of the ores. fuel and wastes. The ores come from the | mines in the usual form of hopper cars to the receiving bins. which lat ter have a capacity of 5000 tons. Two 30inch endless conveyor belts take the ore from these bins up an incline to the top of the crushing and sam 1 bling house, the capacity for the two being 200 tons per hours Not all of the ore is as yet belt handled There is . portion of the deck where bar rows are used, this being purposely so left until the plant was completely | tried out. In case of accident hand handling of ore in barrows can be per formed insuring supply for the needs of the plant This end of the deck will soon be equipped with conveyors however, as everything is moving per fectly.
 An Accurate sampline System.
 The ores are delivered to the tor of the mill to the initial crushers. AT ter passing through these one-tenth goes to the sampling side of the mill being automatically cut out by Shy der machines, the reject going to the ore side of the mill. From the first floor the ore to be sampled, the ten per cent taken from the original lot goes to the second floor and is again cut, this time twenty per cent of the former ten per cent being removed the reject going to the ore side of the mill as above. On the third floor there is another cutting out of the ore to be sampled, twenty per cent of the ore sent down from the second floor Al the fourth floor the final cut for sample is taken and 1t represents only so pounds of the original 100 tons started from the top of the mill There Is finer crushing at every floor So the final sample lot is a most ac- curate average of the 100 tons, or any multiple of 1t.
 How Differences Are Adjusted.
 The final sample from the-- mill is taken out and locked up in a compart ment of long TOW of such places and from this it is taken for assay The company's assayer takes sample and one is also taken by the agent of the concern contributing the custom ore in case any such ores are being treat cd If these analyses agree. the ore ln that sample department is released In case there is disagreement then an umpire is called in who makes a test The party whose results more closely agree with that of the umpire gets the decision Thus far in all the thousands of samDlings made the com nanv has only once been declared a' fault and that bv only very small marpin. meaning very little in the lot of ore treated, It goes to prove the