Arizona republican., 1916-12-15

Safety Fl the exterior of the mine. and a quant . ity of air sufficient to prevent dam gerous acculumation of gases is fore ed in Doors and curtains are also used in the open drifts and at stOpe entrances and outlets to make the control of the air draft effective. Each stope or any section of it can thus be segregated and handled as a unit.
 The fire zone. as a whole, IS also wrought as a separate unit of the mine and operations nre carried on continuously in three shifts. Owing to the precautions taken bl. the man agement and the skill with which the air for Ventillation Is controlled. con ditions for the miners are nearly as comfortable as in the other workings. and practically no more hazardous The overland, square set system is used. hut will be changed over before long. or as soon as the old smelter ovcrlying these ore Lodies is removed. to the method. mentioned below, which prevails in the newer part of the mine. Compensation allowed the min CTS Is on the straight S-hour basis, no contract work being done in the fire zone
 New fires occasionally break out but are not troubles ome. unless they get into heavily -tmbered section. Chemical extinguishers are freely pro- vided, and there Is regular fire fighting force. which the miners are instructed in emergency measures. rescue work. etc Bell signals flash signals and warnings by trammers also provide for getting the miners away from danger points qulakly. Safety first" and then fire extin- guishment is the rule rigidly followed.
 In order to facilitate future oper- ations in the fire zone a lateral draft has been opened up one one side through the country rock. with cross cuts to the ore bodies and ventilating shafts raised to the surface. l. is planned however to strip the waste oyerlying the fire district with a steam shovel and work this district. as well as the entire upper levels and down to depth of several hundred feet with a steam shovel or with com bination of the steam shovel and mill hole system.
 "Oxidized ore from both the out crop and fire zones. after being hoist ed al No. { shaft. is dumped to wood en bins and loaded into cars on a track below, at one side The bin gates are lifted by air cylinders.
 The principal operations of the company. however. are in the newer part of the mine. where levels have been opened up down to 15O0 feet with tunnel 6,G00 feet long at th. 1.000-foot level. The 300. f0G and 500-foot levels. also the 800. l.000 and l,200 gre haulage levels. which the l .350 and 1 l.500-foot levels will be- The total haulage equipment for all mine operations includes nine 4-ton, four 6-ton and three 7-ton Jeffrey loco- motives.
 "On the 800 50o and 1.ooO-foo; levels. the first two Of which are also opened by adits there is forced ventilation by means of Sirocco fans driven by Westinghouse motors Min ing in the upper levels of the new section has been carried on for some time by top slicing and filling; but in the lower workings the shrinkage system is being used, and at l,20C feet there Is an immense open stopo known as the Hampton. the largest in the state
 Tn cutting and filling. the orc bodies are worked on an incline tc eliminate shoveling of the ore ana the handling of the waste in the stopc All stoping is done with mounted wat. CT hammer drills. stoping drills being used only in raising. The ground is hard to drill and tight breaking.
 Where there is not sufficient waste for filling underground. rock Is sem down from surface operations. anc ] the bottom of each stope is kept SC near the back that. outside of tho drifts, manways and ore chutes ol mills. there is very little need fol i timbering. This contributes material, fn ht If ! Is only one of the numerous evi- denccs of close. careful management I "Outside of the surface and fir, 1 zones. IS above described all tn, work in the mine is done by con. tract based on the usual footage terms ] for development. and for ore on tn, ! quantity taken out in the stopes, the i price being made sufficiently high t' l cover all necessary timbering, as wei as filling and tramming. For mos purposes in blasting. 70 per cent 2f i tHercules) powder is used. The lamp 1 carried are mainly Justrte carbide Drills uscd include water Leyners Jackhammers and Sullivans. The ai i plant at the surface comprises q 2 stage Ingersoll- Rand compressor, 2 and 52 anu 26 and 44A x4S-inch ant three smaller units, including tw, ] ln2ersoll- Rand machines driven b, ] G-horyepower and 300 -horsepowe I General Electric motors. and Tren compressor belted to 275-horse l power Western Electric motor Al an aid 70 keeping drills in condition 1 the company is using a Leyne gharpener.
 The three adits a3ove mentione, ! provide for mine drainage down {, and including the 1,000-foot level but below that t needs to be forced up, and on the 1.500-foot level 3 concrete station has been constructed which is equipped with an Aldricl ! qnintipiex pump. driven by a 75 horsepower Westinghouse motor, whicl has 2 capa city considerably in exces of the flow All mine water passe over ron scrap, and the copper valuet in il, running from about 1 to 1I tops per day. are prccipitated
 "Tbe main hoisting shaft, No. 2, | served by Welman- Seaver- Morgan first motion hoist, consisting of pair of 20xfS-inch Corliss engine with double reels. having q capacity F..s.