Show utah ore sampling Comp company anys new mill at murray utah embraces new methods which insure finest work plus speed by owen H gray every producer of ore in the intermountain region who disposes of his ivro product duct in this market and who patronizes patroni ses a pill public samp sampling liag works will be intensely interested in the following teel technical mical and highly informative description of 0 the utah ore SImPli sampling nr compani companas Comp anys s new mill and works at murray urray in the lle heart of the smelling smelting sm eltin elting district south of this city the constantly increasing output of metal bearing ores for a long time had taxed the capacity of the old works and the management confronted with the necessity of providing enlarged facilities with willell which to b indle handle the bt business 1 sines 4 decided to build a plant in ili which tons tolls of ore could b be handled and sampled hourly this new blant b has Is 1 now ow been in ili commission for about two months and is doing its work at a speed and with such marvelous accuracy that it already is counted in ili a class by itself editor this new sampling b mill which began handling custom ore in june 1925 was built to handle the companas comp anys growing business and to replace an old mill of small capacity at the same saine site murray utah the purpose of ore sampling is to obtain a few pounds of finely crushed ore or pulp which shall contain exactly the same proportion of each and every mineral as that contained in the whole carload or lot of ore sampled so that an assay of any part of the pulp sample will serve as a basis for a calculation of the total amount of each element in the whole lot As the various constituents of an ore range in size from the finest dust to large lumps and are very irregularly distributed tri buted a theoretically perfect sample could be obtained only by crushing the whole lot of ore to the finest imaginable dust letting it fall in a fine stream and by taking an almost infinite number of fractional cuts across this stream A sample which is correct within the practical limits of tolerance can be obtained by the following process used by bv X wat M X of buil dlug at ra ht fir girat 4 t shed nt at left end diw v of t sample room bild 0 office are in extreme Is ielne being drawn dran from bill bi in ili center new W W mill and tracks while sampled ore covers unloads unloading tupper homer second il shed covers draek scale a to nd right car and left of new mill tower mills are seen meen of old tower to lo car tov top ahe the new mill which has bas a rated capacity of tons per hour contains the best of standard crushing conveying and d power equipment with its arrangement and an details designed to embody the ideas gained ty by the panY in sampling au all during its many years of experience kinds of orpa ores s JIB lak of 0 ity the atah ferrn tan of gray y murdock murdoch engineers contractors salt the utah ore sampling company with sanctioned by current practice sampling process is is outlined crushed as small as the allowable sampling the ore is first mill and this maximum at will vill permit 1 lya l charge possible through a sampling uniform a stream as dropped in as which cuts forward and back entirely machine or cutter this frequent regular regula r intervals a cross across the stream at divides the stream twenty per cent sample and eighty percent rejects the sample is then crushed to one half size 11 maximum and second which 4 passed through a cutter again removes a twenty per cent sample as described above the sample continues in this manner being crushed to half size and having four fifths rejected at each step until after passing the fourth cutter and last set of rolls the sample is reduced to of the original quantity of ore and to a size less than 10 mesh this sample amounting to about pounds for an average carload is then further subdivided dried crushed subdivided and mixed by the most careful and approved methods until about three pounds of pulp remain this is then placed in six properly numbered labeled and sealed scaled packages for delivery to the seller and buyer and for the sampling companas Comp anys files it should be noted in connection with the foregoing that as each time the maximum sized particles of ore are crushed to half size their number is increased approximately eight fold and as one fifth of these are taken into the following stage of sampling the total number of these par FLOW SHEET UTAH ORE SAMPLING CO s MILL GRAY MURDOCK engineers ENGINEER 5 JUNE 1925 U moisture freight car kampic in unloading position tz shaking pan receiving hopper crusher 5 x ro I 1 Is 60 60 tons ton capacity 44 11 4 12 C of same freight ctr 5 in relaine p 51 3 L lion an ark if a 0 IV 5 bufter 3 cutter scutter pa pa shaking p n ft der s r P n 0 jd x 4 rolls eo 1 0 in ca no 10 ine sh 0 caple rait ets 16 bett ron V tides in the retained sample increases from stage to stage this tends to give greater and greater accuracy in the sampling at succeeding stages every feature discloses automatic action the process of sampling a shipment of ore as practiced by the utah ore sampling company in this new mill can be understood best iby by referring to the accompanying flow sheet the ore is dumped or scraped out of the car through grizzly bars on 12 inch centers into a steel receiving hopper large enough kohold to hold a maximum sized carload lumps of ore too large to pass the grizzly bars are broken down by sledging until they drop through surrounding the hopper there is a flooring of sheet steel and extending a car length up and down the track there is a ti tight ait oit plank floor so as to catch every bit of spilled ore which Is then swept into the receiving hopper without loss or contamination tami nation when the car is empty and has had all ore blown off its y compressed air it is rolled forward to the track scales under the reloading chute ready to receive its irs original load of ore after same has passed through the mill from the receiving hopper the ore passes onto a 30 inch steel pan conveyor running at 30 feet per minute controlled by a friction clutch discharging 6 on to a shaking grizzly the oversize lumps are fed b by y this grizzly into a 15 x 24 jaw crusher running at r p m and set to crush to 3 inches or finer the product of the crusher joins the undersize from the in the hopper feeding a 24 inch belt conveyor and passes by way of a shaking pan conveyor to a set of 54 x 16 crushing rolls set to crush to 1 ya or less all of the ore is then raised by a second 24 belt conveyor to a small hopper from which it passes through an 8 rectangular opening into the first cutter from this cutter 80 of the ore goes directly into the boot of the elevator and is raised to the reloading bin and 20 retained as sample sampie passes by way of a shaking pan feeder into a set of 36 x 16 rolls which crush it to ya Y or less raised again on a 14 4 belt conveyor this ya product passes a 6 cutter the 80 rejected by this cutter flows through a chute to a 16 belt conveyor running just below floor level under the last three sets of rolls and carrying their rejects into the elevator boot the sample now reduced in ill size to or less and in quantity to 4 of the original ore stream is twice more raised subdivided and crushed as shown or on the flow sheet passing through two 5 cutters a set ot of col 24 x 12 2 rolls and a set of 18 x 10 rolls before being collected in a steel sample buggy enclosed in a dust ti tight ight safe sa e under the last set of rolls it will be seen from the above that the ope operation operatic ratiO n is entirely automatic from the time the ore is dumped fro from tile car until the sample is received in the sample safe how the pulp is handled after sampling after the ore has all passed through the mill the san pie is taken from the safe into tile the cutting 1 and bucking rooms for further treatment as already described clea cdean after each lot of ore has been run a thorough of tile the mill is made by means of brooms scrapers scrapers and com c are pressed air so that all parts of the mill and equipment th freed from the ore of one lot and same is all colle collected acted it i of lot lo 10 overhead bin and reloaded into the car before a new ore is started through ethe the mill great pains are tadd this cleanup so OS SU as to 01 avoid accidental salting so of quo one lot so of ore by eal leavings from any L AT other A 6 8 ingersoll rand compressor furnishes im air which si is piped to ol ilu all parts so of the ogi mill ill for 0 cleaning the use so of a shaping 0 pan feeder p for receiving the sample ale from each cutter pul and discharging it 41 into the adji next set so of silo rolls together iz with the use so of belt conveyors 1 rather than LI pia bucket 40 elevators for boj handling ulal 0 the sample combine to oi give dall a steady MOU flow so of well mixed zuo ore through knoup each cutter thus 16 7 1 4 A 1 interior view iaia ions aisle with sampling knits in it III all on ito one noor air water power and lisett binem are mt 4 seen itaf 0 conducing to 01 accuracy so of zi i results z the sizes so of 10 ore sl as shown on the MOU flow sheet under 1 each set lag of 10 rolls are the maximum allowed JOS for ore 0 of 1 ordinary value put and LID characteristics sz for aj high grade apul special ores ill the rails c are da set ps up to oi give smaller sizes all so of the cutters kiino S iu diu are D designed pu to 01 take a 20 sample uie 8 cutter makes ot 40 cuts per minute the ill 6 cutter 42 sinz ts per iod minute and the 5 cutters V VV 44 cuts per iod minute zal percentage figures shown above each conveyor show the percentage so of the OT original zio ore stream LD carried on at conveyor plant jatal jutal gj differs sj ij from tuo earlier faipea types adal S this alq eld plant au differs s IS luois from luo the olp earlier types of 10 sampling smili ills in U that III all so of the taj crushing units m om are o on one general iuga ir floor vel al that lr q belt conveyors are used gasn instead so of bucket iona ID ele oral pue and in ul the use so of a new mou type so of s sampling ILI machine signed by the companas comp anys engineers sive of 10 ul an office cutting pur and bucking i rooms on LIO buo ouo 0 con 3 pulou a blacksmith shop on the other the mill proper flonoi of JO a 13 story building 22 feet wide by feet t feet from ain floor level to 01 ceiling the beam SI ls acted SO of reinforced 1 bojum fa concrete columns and alake mat alth ck curtain walls and large steel 13 sash which I 1 an 1 t nsnan unusually e light mill 0 this p Z earlier i signs had been followed for 10 a 1 mill so of and P y lt would have abeen necessary to oi build a tall pup and p pu VP nry stron and p expensive building ui in order io dp to 04 support the sa nt nation iba from the heavy XA crushing rolls or else saz a 1 points 1 would daub had to 01 be elevated ILI at one duo or 10 more V y means so of bucket elevators on a hp all e u argement ji an gement adopted each crushing unit ian 4 rests catl to the X I paa concrete foundation carried directly around p so Os that in part gjud ot 10 there ST is OU no vibration ui any am the 3 plant ul in spite so of zill the large ground noia pu area covered this u mill itu IT sull has cost ou no more glou than al ul the al vertical type mill would have cost a for lo 10 handling sample ore aio it 11 st is believed that belt conveyors have a great advantage over bucket elevators or 10 long crooked chutes because z they can z be cleaned readily and present z OU no pockets nor inaccessible places where bilm z ore might lodge the use of jo belt conveyors as ordinarily XII installed would not be permissible ui in a good sampling bui mill because of jo the gill spill ij from wo the belts it 41 was siam adi recognized p iby zip the management manthe 1 lu at the OLD start that it 41 would be q imperative to 0 provide oid OPA an efficient means to 01 prevent lp all spill ij from wo either wet or jo dry 01 10 e this has been accomplished UT in the new mau mill by using a u special arrangement so of thin rubber skirts on every hopper that feeds a conveyor belt by installing a rotating fabre fibre or 10 steel wire brush on the underside so of the head puza pulley so of each conveyor and by using skirt boards coq sp throughout 10 the qa whole uzl length so of each so of the conveyors carrying sample to 0 which are ac tacked canvas strips dragging lightly on the top dol surface ins ej eains of jo the belts near the edges original TUU features in uz new machines the ill ore aio cs sampling machines or io cutters su as shown ui in the accompanying photograph used ui in this sup mill were de I 1 W t r p at OJO alundu jagta aa naama 11 pt lill jal inlo 0 j 0 1 pal 0 aa jall 10 lipaj jami laul 1 0 JO jill 11 1 I 1 ta W I 1 u 0 JO laj I 1 jo iliam baull 11 japa request so of wil the tutu management jut ut in tile an signed pulis by the engineers it at features and stiv avoid IJU all defects Q pooh good the to 01 preserve za 0 incidental to 01 most so of attempt 41 jitu in inherent jua III 0 or either az 1313 detailed discussion and disadvantages without III going into 1 a 1 the atit previous designs cutter to 01 I 1 mra PIS strictly correct said that a Is it I 1 may be sample from a falling stream of ore must have the following characteristics 1 the sample opening with its knife edges must cut entirely across the stream of ore at frequent regular za intervals of time 2 it should move in a straight line or at least in one plane 3 it must move at a uniform velocity while cutting across the ore stream 4 it should have a reciprocating motion that is it should pass forward and back across the stream so that the return trip will compensate for any selective action on the forward trip and for mechanical reasons the cutter should take up I 1 little head room it should have steep sloping chutes and no places where wet ore will stick its knife edges should not wear into curved lines and should be easily renewable it should be so designed that ore st to any part of the reject openings and compartments can never drop into the sample its wearing parts should be renewable and the entire machine should be rugged and long lived the utah ore sampling companas Comp anys cutter fulfills all of these conditions A carriage mounted on roller bearing wheels and carrying a sample opening moves back and forth in a straight line it is actuated by a cam driven by bevel gears running at constant speed so that the sample opening travels at a uniform velocity while any part of it i is s under the ore stream I 1 patents for this machine have been applied for methods of handling cars crushing etc for handling cars of ore there is a straight railroad track I 1 parallel to the west side of the mill with a down grade i in it the direction of travel ore cars are placed upon this track beyond the south end of the mill by the switching locomotive and are rolled down one at a time as needed to the receiving hopper after being unloaded the car is rolled forward about feet farther down the track onto the track scales where it is under the chute from the reloading bin ready to receive the same carload of ore on account of this arrangement of bins the straight track and the down grade in the direction of travel no switch engine is needed from the time the cars are first delivered until they are ready for shipment with the exception of the pan conveyor and jaw crusher which are in a pit below the general floor level and the ilie reloading bin in a tower above all other equipment is on the main floor level A narrow basement 7 feet below the main maill floor runs the entire length of the mill and gives access to the hoppers under the rolls and the lower ends of the belt conveyors the reject conveyor also runs through this basement all main and basement floors are made of concrete laid directly on the ground all of |