Bisbee daily review., 1908-03-29

down we installed Aero pulverizers. These machines showed during the tests no radical faults and there is no doubt that they can be mace me chanically successful.
 Miscellaneous.
 The powerhouse has had. the addi- tional blower installed as mentioned. During the closedown we have aiso repaired the foundations of the two Allis-Chalmers blowing engines. and are dismantling the large Rand com pressor and are putting in an entirely new foundation for it. The latter en- zine is one of the most efficient and the largest compressor we have for the converters, but it could not be operated on account of the faulty foundation.
 We have also ordered and will fn- stall barometric condensers and cir culating pumps for the powerhouse, together with the necessary cooling towers, somewhat similar to the con densiRg system MT. Cole installed in 1907 at the concentrators,
 During the past year we had dis astrous fire, destroying most of our supply houses, the machine shop, blacksmith shop, etc. These were To- cated in a hollow on a different lever from the smelter and railway tracks, and the only means of transportation between the smelter, powerhouse and railway was by wagon or stone boat. During. the year we have built a new supply house, under one roof, acces- sible to both the standard and mar row guage railways. We have arso built a new machine shop, pattern T blacksmith shop, accessible to both systems of railway and to the shelter trolley tracks. This does entirely away with the wagon haulage and renders the handling of heavy ma,er- ials for repairs simple and easy. The buildings are not expensive and were designed under the special direction of MT. Cole and are models for eff ciency and cheap work.
 Cost of Mining and 5eneficiating.
 The cost of mining and beneficial ing ton of ore at Cananea, includ- ing the cost of freight, refining and selling the copper, has fallen year oy year. The average cost for the per iod in question was-aDout one-fourth less than for the year 1906, and 30 per cent less than for 1905. This re- duction has come almost altogether from reductions in the cost of mining There will undoubtedly be a further decrease in this item and I look ulti-, mately for mining costs fully 25 per cent less than the present.
 Reduction in smelting charges per ton of ore has not decreased for the reason that at the closedown we were only approaching point where some of the improvements could be utilized. On the other hand, throughout the period we were charging of the very heavy expenditures for labor and ma terial against operation. When we start up the works, however, the im- provements enumerated under the heading of The Reduction Works" will be completed and we will receive the benefit of all these improvements, and at the same time the large ex- penditures for extraordinary repa.rs will stop. We, therefore, fairly look for notable decrease in mining and beneficiating per ton when we start up without further notable in crease in capital expenditure
 On the same lines we are giving most careful study to other items of cost that may be reduced without large capital expenditure, including the problem of decreasing the per centage of barren fiuxes, raising the grade of the matte, getting converter lining containing values instead of using barren quartzite, etc, etc