Show L THE NEW laboratory w AT THE STATE SCHOOL OF MINES BY ROBERT 1 ft I BRADFORD fk phd B PROF or OF MINING AND t for the training of the young engineer at t tile Q utah state school of mines for his work F in mining and metallurgical plants there have been established strong laboratory t courses in all the engineering subjects the laboratory equipment in mining and metallurgy is particularly particulars y complete and up to date during the last year there has been erected on the university grounds a commodious building which is devoted exclusively to the work of concentration assaying and reduction of ores fig 1 taken from a photograph is a view of the metallurgy building the right end of the building is constructed of brick and stone and contains the lecture rooms the analytical laboratories and assay furnace rooms the left end is of steel construction with two continuous rows of windows on three sides and contains the milling machinery the smelting smelling sm elting furnaces and accessory apparatus the building is shown in plan and vertical section in figs 2 and 3 with arrangement of rooms and equipment in detail A detailed description of the equipment quip ment for assaying was published in the feb lath number of the mining review on 2 the second floor in the brick end of the building are placed the lecture rooms library room research laboratories includes a dark room and the offices I 1 tho the steel construction of the mill end ot of the building with the double rows of windows has proved a decided success in supplying abundance of light throughout the entire mill the windows are operated by special opening and closing devices which make it possible to 0 open P en the sid sides es of the entire mill m in a few seconds the ore is brought into the building and distributed the furnaces leaching vats or crushing machinery by a bucket tramway the tramway track is supported on hangers atti attached ched to the overhead joists foists and timbers A hydraulic platform elevator raises the buckets of ore to the second floor where they are discharged into the hoppers leading to the furnaces and ma chinery the furnaces are arranged in line north and south and are all connected with a main flue running along the wall of the building before passing out to the self supporting steel stack the furnace equipment consists of a 20 inch water jacket blast furnace for lead or copper smelting smelling sm elting a roasting and smelting smelling sm elting furnace with a hearth area of feet a bruckner cylindrical roaster and a revolving drier for drying ores preparatory to roasting or cyaniding cyan iding the air for the blast furnace is furnished by a green rotary blower which also supplies blast for the gas furnaces referred to above A cyanide plant erected in duplicate with the solution tanks vats gold tanks zinc boxes sumps bumps and a centrifugal pump is also provided each leaching vat has a capacity of one ton of ordinary chanid ing I 1 n g ore the tanks t an ks are arranged in steps from the upper to the lower floor in order for the solutions to proceed by gravity A filter press operated with a belt driven air compressor is installed near the cyanide plant this enables one to get results from the process quickly the compressor also furnishes air for a rock drill used for demonstration purposes the chlorination barrel of the smallest 41 c 7 clr W wa 6 moo A Z 21 POE 4 FIGURE I 1 commercial size four feet long by 30 inches in diameter is shown in fig 2 the barrel is operated from the main line shaft through a series of belts and pulleys and reducing gear wheels the crushing machinery includes a inch jaw crusher of the dodge type made at the gates factory of the allis chalmers works a pair of inch crushing rolls designed by mr nevill of salt lake and manufactured by the davis howe foundry co of the same place a three stamp battery of lbs ibs to the stamp with amalgamating plates at 3 foot huntington mill also connected with the amalgamating plate a laboratory jaw crusher of the braun type and a sample griver grinder the two latter are employed in preparing samples for assay these crus crushing hing machines are arranged in a line across the main room and are run from one line shaft dritt by a 15 h p induction motor the dodge crusher the huntington mill and the sample grinder have tight and loose pulleys while the rolls stamps and sand pump are put in operation by the orton friction clutch from the main line shaft are also operated the jigs the bucket elevator the sampler and thle the revolving and shaking screens and the belt driven air compressor the concentrating machines embrace a three compartment hartz jig with screen surfaces inches a wilfley shaking table a 4 foot boot frue vanner and a magnetic separator besides these there are provided three hydraulic classifiers a settling tank and three large sumps bumps for collection of slimes the tables magnetic se separator parater pa andro tary blower are operated from a second line shaft driven by a 5 h p as shown in plan f fig g 2 the ground floor is entirely of cement and slopes one fifth of an inch to the foot toward the sump end of tie the mill this allows all water to drain to the sump and enables the cleaning up of any material from the floor by flushing it into the sumps bumps with a hose the water from these sumps bumps is used over again by being raised with a centrifugal pump to two large tanks at the top of the mill the crushing sizing and concentrating machines are arranged to be operated automatically mati cally as a complete concentrating mill or each machine may be run separately and the products stored in bins to be treated further on the following day the latter method of operating brought about by a special system of launders laun Aers ore chutes bins and sand pumps is particularly useful for laboratory work with classes of students who can spend but a few hours of an afternoon in the laboratory at one time with this arrangement a lot of ore may be crushed or crushed and sized then stored in bins ready for treatment in the concentrators another day complete stamp milling tes tests test t a r gold ore including the concentrating of the metallic sulphides sulp hides can be run automatically using the stamp battery or mill the amalgamated plates and tables or vanner A testing plant consisting of a three compartment classifier four small two com apartment part ment jigs with screen surface inches and four wilfley tables with table space inches in chers makes a very useful addition to our equipment it is employed in n making concentrating tests on small quantities of ore these small machines are adjustable ju stable admitting of any variation in the number of strokes the length of each stroke the amount of feed water and the amount ot under water the jigs and tables are operated by a line shaft driven by a one ter horsepower horse power single phase motor connected up to the electric light circuit the treatment determined for a certain ore on these small testing machines machine scan can be verified on the larger apparatus the jigs and tables are mounted on a frame which also carries the line shaft under the jigs and tables are four settling tanks of the pointed box bo type fig F ig 4 is a photograph 0 of the testing plant in place in the mill ore for treatment in the all allf n inay ay be h automatically sampled by a besin vesin or a abria ton sampler located just below the thenn upper end of the bucket elevator I 1 with the complete equipment ai just st referred to we are prepared to mak tests on any ore to determine the best V process aces of at treatment and the proper equipment of the i mill or smelter to be erected for any ore the metallurgical laboratory white while be h ing designed principally pally for labora laboratory tork use in III 3 connection with th eState school of a mines will be operated regularly for the commer cial treatment of ores for assaying conj con 1 cent rating and reduction tests P 1 61 IL 41 PLAN or 2005 5 FIGURE 2 |