Bisbee daily review., 1910-09-25

of competent stan, and sick and I, injured employees of the company receive the best of medical and surgical attention and expert nurs- ing.
 | The Phelps Dodge interests have owned the Pilares mine since 1897. Following the purchase from the Guggenheim interests, two years were spent in development and con struction was then started. At that time the Nacozari railroad had not been built, and it was necessary to haul all equipment from Naco. on the international boundary, ninety miles distnat. A 500-ton shelter. a GOO ton concentrator. and gas produc- ing power plant were erected, and in September, 1900, the concentrating and smelting of Pilares ore was con- menced. Blister copper was produced and shipped out overland. In 1901 the Nacozari railroad was built as far as Cos, at the entrance to the canyons, twenty-two miles above Nacozari, and Cos remained the ter minal until 1904, when the line was extended to Nacozari, With the ex- | tension of the. railroad the smelting 3f ores and concentrates at Nacozari vas discontinued. and all concen- trates and high grade ore shipped uo | shile the chloriders at various points the big shelter of the Copper Queen Consolidated Mining company. anoth. CT Phelps Dodge concern at Douglas. The shipments have continued since that time.
 Ore Supplies Proved.
 Several years development proved the great ore supplies of the Pilares mine, and it was decided to erect concentrator capable of handling 2G00 tons daily. The plant was com pleted late in 1908 at a cost of ap- proximately s1,000,0 900, gold. and to day no finer concentrator exists. The ore is handled in trains from the mine, and is dumped direct from the
  The equipment of this plant consists of one No. and two No. gyratory crushers, two sets of trommels, con veyors and a dust collecting system. thirty-six inch conveyor takes the ore passing through the Grizzly from the No. crusher to the trommels, and twepty-four inch conveyor, TAO feet long. carries the ore from the No. crushers and the undersize of the trommels to storage bins at the iconcentrator In the concentrator the ore. is carried by an eighteen. finch conveyor over Weston automatic weighing machines. and the feed is sized on tromnlels of IS. 12, ', 4 and |2h miIlimetres. There are SIX course and twelve fine jigs for each 1000-ton unit of the plant. The over size from the eighteen millimeter trommei is crushed in forty-two by sixteen rolls, of which there are three sets for each side of the con centrator The classifying is done on Swain classifiers and the Callow screens, the classified feed going to forty-fonr wilfeys and seventy-two Johnson vanners All elevators and all tanks are of reinforced concrete. Tunnels that extend the full length of the concentration, with laterals running under the different ma chimes. form a feature of the plant. All tailing and concentrate iaunders are below the floor.
 Nacozari Power Plant
 Current for the Operation of the concentrating equipment, and for all mine operations, is supplied by a power plant at Nacozari. built in con nection with the new concentrator, and of the highest efficiency. It Is equipped with four 450-horse power Stirling boilers, and three 1000-kilo- watt Curtiss steam turbines. Coal from the New Mexico mines of the IStag Canyon Fuel company, another Phelps Dodge concern, is the fuel used.
 In 1909 the Moctezuma Copper company produced 517.s27 tons of ore, and handled 517.094 tons in the con Icentrator The ore averaged 3.22 per lcent. copper, and the total recovery was 110,725 tons of concentrates, lcontaining 13,05s tons of copper. Af- tier the payment of ssss. 600, gold. :n dividends in 1909, the company open ed the present year with a surplus Iof s2,161, ,4s0.26. gold.
 Ore Body in Crater.
 l The pilares ore body is an old vol canic crater. In shape 1t may be lcompared to a gigantic pear. meas turing 2000 feet from end to end, and 800 feet in its widest part. The orc lmay be iikened to the skin and cors
 of the pear. the skfn varying in
 thickness from zero to 200 feet, and
 the core representing an area 30ox 300 feet Two main working shafts,
 each of three compartments, have
 been sunk. and these are known as lthe Pilares and Espiransa At depthl Iof SIS and sss feet, respectively, the shafts connect with the Porvenir. oI main traction tunnel, with which all , workings are connected. and in whicf