Arizona citizen., 1879-06-06
FROM TOMBSTONE.
Tombstone cOmpuny's Work-Tbe Mil n
 Successful 0perahon-Resuits.
TOMBSTONE, \. T. June 8. 1879.


 EDITOR CITIZEN: The vast quantity and quality of the work on the Tomb stone Company's mill, with its dam, Hume and tail race, should be seen to be appreciated. A dam 200 feet long. which leaked little at first, but which is now almost water-tight, has been constructed across the San Pedro river about one mile above the mill. From this dam the water is conducted sthrough a ditch and 1,25O feet of fiuniing, the total length of ditch and Hume being one and one-third miles and the fall one and four-hundredths inches to the 1O0feet The Hume is 4115x215 feet in the clear and the flow of water 500 inches The water enters the iron penstock and falls vertically forty feet, into a twenty-five-inch Amer ican Turbine wheel, which makes 800 revolutions per minute The connec- ton between the wheel shaft and the
  main shaft is made by beyeled gear, and from thence to main counter-shaft ! by a twentyinch belt. After leaving the wheel the water runs through d tail-race into the river. This race is a tunnel 470 feet long, thoroughly Jagged, lined and timbered. When taken into consideration the facts that 200 feet of it had to be forced through hard rock cement and there was a heavy flow of water to contend with the entire distance, it is evident that it was no small job of the many vhich Superintendent Gird has had to ac- complish
 Having given you a description of. the motive power and the method of. controlling il, let us go to the dump and follow the ore through it's course of reduction. IL is first fed into the rock-breaker, from whence it drops into a Whites rotary dryer. The bal ance-whecls of the rock-brcaler make 200 revolutions a minute, aud its ar. rangement of wrought, instead of cast. Iron toggles 2nd setsscrew gibs, makes it impossible for it to break in case of. any extra hard substance being by aci cident or otherwise dropped into it.. An instance presented itself by one of. the men dropping an eightpound striking hammer into it and no harm resulting. It devours the quartz now being milled as fast as one man can shovel ii in.
 The dryer i> composed of cylinders set on a slight incline and revolved on friction rollers. It revolves slowly, and the ore which passes through is subjected to a moderate heat from the furnace at one end and turned through spout into the chute and from thencei into the Selffeeders and the battery.
 The battery is of ten stamps, with a. drop of 100 per minute. It is one of. the class known as knee battery, and is pronounced by all who have seen itI to be the model of the coast. TheI cams are made from patterns especi !. ally designed by Superintendent Gird, with a view to increase their leverage by bringing the bearing surfaces closer to the stem than is customary and at the same time retain their proper relative position to the tappits. The pulp, after leaving the double dis charge mortar, is passed by screw carriers into an elevator and raised to a bin overhead, from whence it is con ducted by spout into a car. This car is run on a track directly to and above the four amalgamating pans and its contents dumped into them whenever a charge is put in. A crab car with 8 power bully runs on a tram way overhead, and the pan-tOps can be easily removed when charging orI the mullers removed in case of re- pairs. Another of Superintendent Gird's improved patterns presents itself here-the wings attached to the sides of the pans for defiecting the current through openings in the null Ter and causing it to run directly under it.
 Next below are two large settlers and the amalgam sacks. Below the settlers are tramway and car for run ming amalgam into the retort room. Here are two retorts and a melting furnace: also a siX-horSe power boiler for supplying steam for the pans and q steam pump. The sacks were filling rapidly with compact amalgam, which will be retorted in day or two, and on Wednesday the first bullion will be run out
 The tests already made show the ore to be worked-free milling-up to v per cent. of its assay value, and the bullion to be 96S fine. The pulp as says of the ore-third class, from the Tough Nut-for the first three days were sS6. SS9 and $92, and the amount of ore consumed in these three first days run was over forty tons. The usual run will be from twelve to if teen tons in twenty-fOur hours. T
 Ore sacks have been received at the mine and higher grade ore will bel worked immediately. Close calcula- ton places the cost of milling at moi
 -, .t,.,, sS nor ion. This of course ,