Bisbee daily review., 1905-08-10
DOMINION CONCENTRATOR
 IS AN UP TO DATE PLANT
NEW MILL HAS A CAPACITY OF
 THREE HUNDRED TONS.
First Test Run Was Made July 3oth, and the Starting Was a Complete Suecess-Building Is of Steel.

I
 
 The concentrator at the Old Domin-
 ion is of the progressive crushing tyre. On account of cheapening construction
 and economy in operation. the first op- erations begin in the crushing plant at the new shaft where the concentrating ore from the mine is brought into two
 of the six steel bins. The ore is drawn from these bins onto a belt and from
 thence passes automatically through the coarse crushers over a picking
 belt, from which the first-class ore can be sorted, and through a fine
 crusher and a set of rolls and from
 thence it drops to another belt where
 it is carried to the two concentrator storage bins each holding 210 tons of
 ore, and there stored. The ore is
 drawn mechanically from either of these two storage bins by automatic | feeders which feed onto another belt 1 regularly, and at ans given rate that the mill may demand. The latter belt conveyor takes the ore up a steep | incline to the top of the mill and there | discharges it into a mixing box where the ore is mixed with water and from thence passes into revolving screens. The ore is classified into various sizes in the revolving screens and in classi- fiers below them and is distributed according to it's size to the various machines on the roughing floor.
 The two coarsest sizes. viz. the sizes rejected by the five-eighths inch and three-eighths inch screens. respective ly. drop into two bull jigs and after the very coarse metal is extracted, the tailings pass automatically to the fin ishing rolls and are again elevated un- til they pass through the three-eighths l inch screen. All sizes of material | from the three-eighths inch size down, l excepting the finest shines, are assort- l ed into sizes and passed to the main | roughing floor of the mill where they are concentrated in seven jigs and | the six Wilfley tables. The concen- trates from this main roughing floor | discharge automatically and unite | with the concentrates from the bull | figs and pass to the storage bins for | concentrates. The tailings rejected | by the machines on the roughing floor | are collected and crushed finer, if nee | essary, in two six-foot Chilean mills. | The re-ground tailings are then classi- | fled and are passed to the machines
 
 ment. Automatic devices are used to dewater the coarse tailings and to thicken the slime pubs before they l pass to the finishing floor and the wa ter thus obtained is returned for use in the mill. The finishing floor is | equipped with nine Wilfley tables for the coarser sands and eighteen Frue yanners for the finer sands and shines All concentrates from this floor pass by gravity to an elevator and are ele- vated and thrown into the stream of concentrates from the upper floors and pass to the storage bins from which they will he drawn into railway cars and taken to the smelter. From this description of the process it will be seen that from the time the ore is thrown onto the upper belt until the time that the tailings are turned out of the mill and the concentrates de- livered into the storage bins, every thing is automatic and there is no shoveling or wheeling of any kind.
 The mill building is of steel with steel shaft supports and steel supports for the revolving screens. The founda- tons are of massive concrete and all heavy machines are set close to the ground upon strongest foundations. The floors are built with the tremend- ous strength essential to a mill that will do close and economical work
 The nil is designed to have a capac- ity of 900 tons per day as it stands and by simply increasing the size of the finishing floor 30 per cent, it will easi- ly treat 450 tons daily. Feed was turned on the mill on the afternoon of July 90 and it ran steadily until the end of the shift. There was no time to regulate the flow of water and it has taken a few days to get the mill started to work regularly and have it thoroughly tuned up so that the man. agement knows it is making a good saving; but it may be said that the starting was completely successful and most satisfactory, and it is now demonstrated that the mill will do it's work without any question and there will be none of the vexatious delays that frequently occur in starting even the best of concentrators. Every thing is now thoroughly adjusted and the mill ready for steady work.