Show ers until the L L U ed from the tailings cannot help admit that the successful manner in ft A hi h the values are saved is little short of marcelous mar mari elous tuesday of this meek ft eek superintend ent eatlo L C doty of the bullion beek tine mine george vi IN hay Hae es sandOE and 0 E hulah of jy the reporter v ere show shou n through the plant by dyke V reedy aeed and carl F dietz under whose personal super vision the system has been carefully S v worked out and adjusted to meet the rf requirements of the tintic gintic ore it was mr doty s first trip through the A mill and while he was in a measure familiar with the process he expressed himself as highly pleased with the character of the work now being done being pretty well acquainted with mill work on account of his long ex t peri ence in mining in this and other states he was able to ee why this particular s stem of dry concentration is proving a success the keedy dry ore sizer and the dry dr table which in reality are the t tw 0 factors in the system were very favorably commented upon by mr doty another thing that attracted his attention was the absence of dust notwithstanding the fact that the plant was in complete operation fhe pipes fans and coverings for the machinery not only carry the dust out of the mill into what is known as the bag house but by doing so save these fugitive values below we give a complete outline of the system s stem of dry concentration as in use at the may day mill the ore from the h rece yan bia bill is w r a aoa oa gr th the oer over size being crushed to about nut coal size and this with nith the under concentrator 1 I I 1 t h ha a ire lr ry er ich the ind r ri arse the jat gates 1526 no I 1 roughing rolls and the fines from the toggle are elevated to an 8 inch toggle screen the coarse material from the hattei toggle passes through gates 1526 no 2 roughing bolls rolls the product from no I 1 R rolls is elevated to a i inch mesh toggle the coarse return ing to the no I 1 rolls the fines be ing carried to the 8 mesh toggle from which the coarse goes to no 2 rolls and the fines are ready for sizing by this method of gradual reduction the very least possible quantity tv of slimes la is produced all the ore is crush so as to pass the 8 mesh screen and arid elevated to a receive ing bin of about 4 tons capacity from which it is fed into the keedy dry ore sizer one rejection a made from the ore sizer that being on 14 mesh this product being rec re rushe d in a pair of sturtevant high sp speed e ed finishing rolls and then reenters t the he system keedy dry ore sizer a wonderful invention the keeda aeed dry dr ore sizer is a ma chine that is filling the long felt want and absolute requirement necessary to successful dry concentration it la is a remarkably simple machine requiring practically no attention has an enormous capacity capi city consumes but one horae horse power of energy under full load and speed resolves the ore into ten sizes and a fines I 1 product to an exceptional degree of accuracy the beedy reedy dry ore sizer as installed at theuay P day PV V mill being operated by ff r r je the e Cactus ili 0 ore re co 0 ii i being run at a capacity of 65 tons in 24 hours splits the ore into the following sizes and percentages V f per cent cen through son 8 on 14 10 p through 14 on 28 26 35 through 26 on 38 36 14 through 36 on 50 10 through 50 on 62 8 through 62 on 72 through 72 en 86 5 chrol gh 88 86 on 5 through 11 on 2 through on 2 bines k ines 2 total at the cactus ore company boston new york and eurela a builds these Is eedy dry ore siz e r in three siz s rai rat ging from 65 tons tonsil I 1 tons in eveia 24 hours the above table shows in a marl e d degree the very small quantity ot eifle material that is produced by gradual reduction sy system stem in itse itsek T it stands for a savins in values the accuracy of the keedy reedy sizer is borne out b by the fact that out of the product caught on any mesh practically non of it will pass through the next finer screen this chews the material to be in each case perfectly free aiom undersize and proves the remark able efficiency of the sizer the products from the sizer each pass to individual storage bins from which they are tapped separately through 2 inch pips bips directly into the hoppers of the concentrators there are two types of concentrating ma nia chinery being used at the present time one being a new form of dra dr bigg s to the hooper but an improved rit thereupon and the thid other is what is known as the button sutton dry table I 1 the aggs handle bandle the sizes on 50 62 72 and 86 mesh while te tle table handles the very coars cears 28 26 and 36 mesh and the very fine and fanes fines the rl he type of the former of these machines is quite well known while the latter is an entirely new machine and proa pro duces a marked degree ot of w 0 all those who hayak seen itt aa j the capacity of this dry table is fully three times that of the best wet table and in competitive tests has proven that cleaner products and higher sav ings are effected this table at the m may ay day mill is regularly being oper abed on the boase sizes with a capacity 0 of f 4 pounds per hour down to 2 rounds per hour on the fines finest the fhe quality of the work that this table will produce depends directly upon accurate and close sizing of the ore and in conjunction with the heedy reedy sizer makes a team the equal of h one may search long to find this process has been amply proven out on sulphide ores in quaita at warren new hampshire lampshire where the warren separating company lias has been op rating wilh with signal success for a period of years however the process at warren was somewhat some whai modified to suit thair local con editions offered induce ments for the treatment of somi complex ores which aich hae have to the pres ent time not been susceptible to an any method of treatment day mine occurs both in the galen and carbonate forms and to add to thib this complexity the carbonates them selves vary in physical structure ver very materially ranging from a beav heavy solid mass to a light porus sand structure tuie the gangue consists 0 quartz limestone and some spar the silver liver values are also in corn coin plex form part of them being assoni abed with the galena part with th carbonates arbo nates and ancl a part in the form 0 chloride a very light powder fhe ME silver in the chloride form is dis bed ted all through the rock the corn coin plex character of this ore in itsel itel necessitates close sizing so izo that dur ing ng the concentrating action on th able the specific gravity of the indi inda vidual particles may assert itself anc an thereby be brought into their propel positions ions the action of the tabu hows hous distinctly distinct Iv the various cons titu ants of the ore the galena climbing 0 the higl higi est point with the car onate line coming next then shad ing off into the iron and gangue these rhese various lines are perfectly dis anat on the table top the saving af t values effected is indeed astonish ing and satisfy ing daily the ore the concentrates concen and the tailing products are carefully sampled ana assayed up to date the avera average d re of concentration has bee been about abi 7 tons of ore into 1 ton of concentrates th tile latter running from 53 to 55 per cent lead and leaving a tailings pro duct cari canting ying but only between one half ani ant three quarters of 1 per cent lead the average lead saving up to this time has been a shade over ON er 90 per cent while the average silver saving shows itself to be about 71 per cent the silver saving may appear low as compared to claims male by many mill operators concerning their work but the complexity of the character of the silvar N lalue alue must be considered the fact that the silver is distributed all aI through the gangue would lecessi tate extremely fine crushing for tl ti e purpose of liberating it if this method were followed other losses would more than counteract the add ed saving in silver silver in this form is entirely by water it being so tine that it floats away as tailings upon inspecting the plant under its pres present nt full capicio there are wo tw features which impress themselves foremost the first being the automatic simplicity of the operation and rela ively little attention required it tak ng only four men 0 operate the mill per shift and secondly the freedom of dust throughout the plant which is astonishing all crushing and ore handling liand ling machinery is connected by means of galvanized iron suction pipes with four exhaust tans fans these tans fans collect the dust carrying it through a 22 inch pipe to a bag house where it is deposited this dust is extreme ly tine it all passing through a mesh screen and some of it is very much uh finer there is about one half to three quarters of a ton of this dust collected for every tons of ore crushed and treated it will assay erom from 10 to 14 per cent lead and from 13 to 18 bunc ounces s silver it is readily been een that the proportion is relatively very small but by the system installed install od even these otherwise fug tive values are saved so say nothing of the ng of the dust problem which has been su it a destructive nemy to dry concentration As an example it may be well to cite that visitors wearing black derby hats after spending about three hours in the mill showed no more dust upon their heir head covering than would Oldin anly ve de P eT while N wal kInt h upon acier a city street the reporter has no hesitancy in saying that dry concentrating as in operation at the may da day will even dually revolutionize mining in many sections of the west it is simply a question of adjusting the machinery to meet the requirements of the var ious kind of ore as there can be no doubt but what thia this proposition has at last been solved it is the intention of beedy reedy and dietz to eventually add another sizer and perhaps two more tables to their plant at jie he may day the two would supply three tables nicely and more than double the pres ant output of concentrates these gentlemen are not only will ing but desirous of showing anyone vho aho is interested in the system of ry concentration through the mill at any time in order that they may see i or themselves the various details he cheapness of the method of treat ng ores and the savings effected j |