Show the BI kin kina coalition mine in the last issue or of the mining and engineering world W A scott traveling correspondent tor for that periodical iod tod ical had an illustrated write up ol of the silver king coalition park cites greatest producer which the record herewith reproduces the silver hill underground hoisting and compressor station of thesia ver king coalition mines co park city was completed a year ago and installations have since been made this station situated at the interior terminus of 0 the it ft alliance tunnel is 1650 ft hertica vertically I 1 ly below tile the surface euri ace and is central to a large territory of the companas comp anys undeveloped ground the main working shaft of the property near the collar of which the shops mill and offices are situated opens the mine to a depth ot of ft it is connected to the alliance tunnel by a 2200 tt ft crosscut driven from the shafts ft level in ili all operations at the silver hill station the waste is hauled out through the alliance tunnel and all the ore is taken to the main working shaft and hoisted to the surface where the mill and upper terminal of the tramway are accessible the space cut out lor for the silver hill station was divided into two arch roof ed chambers one of these it ft contains the hoist and steel the latter set upon concrete piers 8 tt ft high reaches aldei ht of tt ft to 10 the center of the G ft sheaves the other chamber 25 ft is the compressor room these chambers are protected by concrete walls and supported in thier centers by IS 18 in I beams the larger chamber contains FL a wellman seaver morgan double reel first motion electric hoist operated by a hp motor the hoist cables are tile the flat rope type tape 1 1 12 1 2 ins having a length of 1600 tt ft each cable is attached to a skip ship of 52 cu ft capacity operating in the silver hill interior shaft this type of skip I 1 was designed by james humes man ager or of tile the property and they werf were i made in the silver king shops the other chamber contains two i sullivan air compressors 2 stage ani I 1 gle type one of them is rated rate at lip hp having a capacity of cu tt ft per minute and is belt driven by a synchronous ous motor generator set tile the other machine has a capacity of cu ft per minute not nd is direct connected to a synchronous motor these compressors supply air for operating the shaft pumps and drills used in shaft sinking which has been in progress several months included in ili the electrical equipment at this station iz 1 one direct cur rent motor direct connected to hoist shaft and other access oi y ment in the main hoist room Is a double cylinder single drum druin hoist for handling shaft pumps pumping equipment sinking pumps are used as sinking progresses to raise water from the bottom of 0 the shaft to cement tanks at each ft station A jeanes ville pump of gals capacity is stationed at each of the station tanks at the ft level is stationed a gal 4 stage worthington pump operating against a a head of ft delivering water at the tunnel level in sinking this shaft the skips aro are too large to load quickly in the bottom of the shaft so provision is made to hang a large mine bucket under the skip the bucket buchet hung below each skip Is loaded raised and dumped into pocket chutes at the several levels this material is at af hoisted in the skips and dumped into pockets at the collar of the shaft these skips have valves in the bottom so they may be ba used as bailers of water when occasion requires it in the old workings tributary to the main shaft there are as strong ore bodies and as high grade ore on the 1300 ft level as was formerly mined in the higher levels and development and production proceeds on levels above the 1300 in a direction toward the silver hill station the mine is producing tons per day of smelting smelling sm elting ore averaging a value of 60 per ton the mill is handling about tons per day the sul aphides and carbonates coming to the mill in ili about equal amounts the mill treatment of the two classes of ore are the same down to the place of handling slimes double deck deister tables made by delster concentrator co have been installed to handle slimes from the carbonate ores about 85 per cent of the metals being saved the first product is made on hartz jigs the reject all being reground in a marcy mill the pulp from which is concentrated on wilfley coarse tables the sulphide slimes are treated in callow flotat flotation ion cells the carbonates from the old workings run 72 gozs silver 55 per cent lead tile the sulphides sulp hides from tile the 1300 1100 tt ft level average 10 gozs silver 7 per cent lead the alliance tunnel sulphides sulp hides average 5 gozs silver and 69 per cent lead in milling the carbonates bo nates a recovery of sa 85 per cent is made and about a 90 per cent recovery is made on the sulphides sulp hides the concentrate ate products are worth about 50 per ton W F devlin is mill superintendent information furnished and courtesies extended by james humes general manager are hereby acknowledged |