Daily Arizona silver belt., 1910-05-01
Making of Ore Pockets for Mining to Be Started
 This Week
RAPID PROGRESS
 ON CONCENTRATOR
Churn Drill Work Being Systematically Proven
 by Drifting

The development of the ore body of the Miami Copper company has reached such stage that the first extraction level at the depth of 42O feet is prac- tically completed and at the second ex. traction level 150 feet below, the active development work, preliminary to ore extraction, will be begun within the next few days.
 At the 420-foot level, the principal work remaining to be done before the production of ore will be commenced consists of driving a number of raises to the sub.levels above, extending the various drifts to the most remote ex- tremities of the ore bOdy and installing the electrical haulage system, by means of which the ore is to be conducted from the points where it is broken to the crushers at the concentrator plant. The making of ore pockets at the station of this level will be started this week and the capacity will be sufficient for about 2,000 tons of ore. Automatic leaders will be attached to the pockets for loading the ore into two skips working in balance and of a capacity of seven and one-half tons each. At the surface, these will dump automatic ally into gyratory erushers, after which the rolls will reduce the size of the crushed ore preliminary to it's convey ance by means of belt conveyors to the concentratOr ore bins.
 A third extraction level will be estab- lshed about l50 feet below the 570- foot level, but not until some future date, after the upper part of the ore body has been mined. As thls means the extraction O. over l3,000000 tons of ore, it IS not unlikely that the third level will be required for number of years. The development of that portion of the ore body lying between the first two levels will be conducted from the 570-foot level and this will De well under way by the first of tne ensuing year, when the production of ore is scheduled to begin.
 At the present stage of the construc- tion work at the concentrator and power plants, it is evident that, barring un- foreseen delays, the completed plant will be in operation by January, 1911. The concrete construction is completed for the concentrator and machine shop and also the steel frame for these build ings, while at the location for the power plant, which is to be concrete through out, with the exception that the floor beams are to be of steel. the greater part of the structural work is compIet- ed. The steel beams are being put in and the installation of the machinery will soon be started and will continue as the material arrives at the site. Pipes for the conveyance of the water to supply the eoncentrator and power plant are being laid from the old Do minion mine drainage pipes to the loea- ton for the reservoir on the hill east of the Miami Copper company s main hoisting plant. This work is being rapidly accomplished and will probably | be completed by the middle of the summer.
 Two churn drills are continuing oper. | ations at the western part of the Miami l with fattering results. The | drill holes, however, will be followed | later by raises to be put from the mine, | and the assay values obtained by sam bling the holes will be checked by more exact sampling.