Show installation Install ati on of three lane mi mills alls at the gloster plant BY ALIM mclaren M E t to more thoroughly appreciate the real avalue value of latter day mining and milling equipment pent one has only to make a tour of some of the older mining districts where renewed activities are asserting themselves in althe ille shape of up to date methods and mechanical ch appliances being installed and winning twinning dividends from large bodies of low ores on which operations pe rations were formerly brought to a standstill tand still when the maximum of efficiency of the methods formerly used the higher cost of operating and the then low grade of the ores failed to show a margin of pro ifft fit for the owners i in the piegan glos G los ter er mine near marys ville montana we have a very good ex f ample ot this inas in as much as this old property was successfully worked by the old owners for a number of years during j which time the sup I 1 ply of better grade ores became exhausted and the large low grade bodies at that time and with the test best available equipment failed in producing 1 dividends the barner king develop ment company took hold of this property during the last two years and after some r very exhausting experiments they equipped the property with the milling plant herein described the writer regrets that at present it only a mechanical description can be iven given notwithstanding ding assurances from the Ina management nagem ent that blat the plant is now efin giving k 9 I 1 entire satisfaction how ore is Han handled died owing to the fact of not having completed underground connections it is necessary to haul a portion of the ore on surface with teams dumping into a surface chute thence to a lower tunnel level from which it is run by cars to a bin at the head of a two aerial 1400 feet in length to receiving bin at the mill from which the mine run of ore is fed by a stephens and adamson belt feeder to a short head no a 5 r T L smith primary crusher then by bucket belt elevator to main mill bin at the head of the elevator a portion of the ore is intercepted by an automatic sampler from the elevator head the crushed ore drops to a stephens adamson son belt conveyor extending the full length of the bin and equipped with a movable dumping device three lane mills from the main bin the crushed ore is fed to three lane slow speed chilian mills each one ten feet in diameter A stephens adamson belt feeder feeds each mill automatically on an ore somewhat harder than the average L na I 1 A P ALT LAKE pavie AV battery of lane mills piegan gloster mill marksville marysville Marys ville montana photo by alex mclaren quartz the combined capacity of the three lanes is about tons per day or fifty tons each the crushing weight apart from the weight of the mill proper con consists of six blocks of concrete each weighing one ton six tons per mill and each block fitted w with ith eye bolts to facilitate removal from the load tank with chain blocks the size of pulp is regulated reg by height of overflow which is six in inches clies fitted with a strip of common fly wire to prevent chips and trash from com ing over pipes wire basket device is placed at the end of 0 the discharge block on oil each mill into which the current carries all chips as they come into the mill and from which they are removed from time to time as occasion demands each one of these mills uses approximately ten horsepower other equipment A forty horsepower motor furnishes the power for the three lane mills two wilfley tal tables kies one aikens classifier and arld lone one art pulp distributor from the lane mills the the mill is one of 0 leavi pulp which on leaving i ig solids to four andja one half parts of solution and one pound cyanide solution being used to crush in flows to a wilfley rougher the concentrates of which flow to a wilfley finishing table where it is re concentrated this last product is a mixture of black sands sulphides sulp hides and what coarse gold may have been in the ore the management stated that this procedure was taken owing to the tact fact of the coarse gold being too irregular in the ore to pay to take care of amalgamating plates and contend that it is better practice from several points of view to crush in solution and keep two concentrators running the care and attention of which amounts to very little the concentrates are put aside for subsequent treatment in an amalgamating pan methods of treatment the residue from both tables go to an aikens classifier clasi fier from which the sands go A rk V it vank S rt lot 3 q A ilk 14 piegan closter mill Marys marksville marysville ville montana photo by alex mclaren to a distributor over one of a series of leaching tanks each one twenty six feet in diameter by ten feet in depth with bottoms arranged for flushing out the slime output of the aikens goes to a dorr thickener seven feet deep and twenty four feet in diameter and is then transferred by a goulds diaphragm pump to one of a serles series of dorr agitators and worked in batches not continuous each agitator is fourteen feet deep by sixteen feet diameter from which clear solution is drawn at intervals during period of treatment by a decanting float the solution is further classified by passing through beds of clean sand in filter tanks ahead of zinc boxes this plant was designed and installed after a long period of experiments by mr mcgee the manager and mr mccormick the superintendent both of whom are unanimous in their statement as to the efficiency of the lane formerly used in respect mill over the stamps to the small amount of power used wear and tear care needed increase in in output per horsepower as well as the absence of the continuous ear wracking noise characteristic with stamps the writer is indebted to mr mccormick for all the information furnished herein the piegan gloster mill the piegan gloster mill property of the barnes king development company at marysville marksville Marys ville montana was recently completed and put in operation the ore is a quartz slightly harder than the average and is delivered to the mill from mine by a two bucket gravity aerial tram 1400 feet in length from the receiving bin at mill it is fed to a no 5 symons crusher by a belt feeder passing the crusher which reduces to approximately one and one fourth inch ring size it is then elevated to the mill bin by a continuous bucket elevator at the head of which there is an automatic sampler taking out a regular portion from head of elevator the ore is distributed throughout the length of bin by a belt conveyor having a movable dump or belt from ore bin the crusher crushed ore is fed by automatic automat c belt feeders to three ten foot lane mills |