Mohave County miner., 1913-02-01
Parke Charming on Miami Mine.

body of that level, and also to get underneath the Captain Ore body and to connect with the Captain shaft The development of the 570-foot level was extensive so as to prepare this level for an extraction level. It is being cut up in the sam rectangular gridiron fashion as the 42O-foot level, and is 50 arranged that when the final method of mining is determined upon, It will be available for any method selected. The third extrac- tion level was arranged for in the main shaft at depth of 720 feet, but nothing has been done at thls point as it may be advantageous to put this level to a still greater depth, depend- ing upon the ore development.
 Of the ore mined In 1912 large pro- portion came from development work and from the square sets and sicing. The shrinkage stopes which have been tried out on the 420foot level are nearly all in shape, but the work of cutting out with square sets above them and the intervening pillars was not completed. The indications so far are that this method of combined shrinkage stopes and pillar slicing win prove to be economical both as re- gards percentage of extraction and cost.
 The early estimates of ore reserve assumed the ore to extend to a depth of only 50 feet below the 57O-foot level. During the latter part of of 1912, eight diamond drill holes were put down from the 570-foot level showing that the ore extends in places from 100 to 200 feet below that level, and in some places the bottom was not reached. The indications are that the orc will go to a much greater depth than was expected, following along the line of the Gila conglomerate fault. The results of 1912 show material in. crease in the ore in sight, together "ieh OASOAiohV pioSPCSeS AoA SohoAhu- ation In depth.
 In January, 1912, the mill was trea'. ing at the rate of 22OO tons per day, and since June at the rate of nearly 5000 tons per day. The approximate production for the year was 32,0O0,000 pounds of refined copper. The years work in the mill demonstrated the in- crease efficiency of the Hardinge peb- ble mills over the Chile mills, and or- ders have been placed for the Hard inge pebble mills to replace the Chile mills as they are worn out. A heavy type of intermediate 42xl6 in. roll developed by the Traylor En- gineering and Manufacturing company, are being introduced, one at . time, in each section of the mill. In ad- dition to this, experiments indicated the desirability of certain amount of mineral which is at present lost in the sand tailing, and these improvements will gradually be installed during 1913. The indications are that with these betterments the capacity of the present mill can be materially increas. ed over its present limit of 5000 tons per day.
 In the power house the spaces left for new machinery were filled by the installation of a 6O0-horse power boiler, a 4OOOcubic foot air compressor, l250-kw. generating set, and second condenser. A second 40O.horse power synchronous motor was installed at the Burch pump station, thus giving tho pumping plant with it's two pumps a capacity of 2400 gallons of water per minute. A tailing elevator was install- ed below the mill, raising the tailing to height of 75 feet and permitting of it's discharge in the second gulch below the mill. On the surface, number of houses were built, and a hospital, jointly owned by the Miami and the Inspiration, is now being erected. The work for the year pro. gressed smoothly and the prospects, as above stated, for increased ore re- serves and an increased tonnage in the mill are most excellent.-Globe Silver Belt.
 
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