Show the mill the ohio at big of copper company utah BY LEROY A P PALMER ALMER W 4 W LU W W 7 fm oil U L L 00 U L 0 1 xv mal 1 j aboto bj harej the ohio copper mill at lark utah unless something quite unforeseen occurs the close of the year will see another rge ge producer helping to push bingham head ead to the point where she can proclaim herself ersela queen of the copper producing world ahen en on march the incline shaft of the ohio copper company made connections from above and below manager colin mackintosh announced that work on the big mill would be resumed at once and that the ohio should be in the producing ranks 1 in n four months time and right here let us remark that this shaft connection was one of the neatest pieces of engineering work ever done in this country starting from the or any other collar of the ohio shaft the surveyors ran their lines down a gulch up one side of a mountain and down the other down the 1400 feet dalton and lark incline into the mascotte tunnel the dalton and lark shaft was caved making it necessary to work down it in a series or of short sights instead of one continuous one the line was run for a mile in the mascotte tunnel where sights of over feet were rarely N asas iss 4 ate 7 ws attig B kf S feiks ie ria F fc h JN tnt T nt tr r 1 I A sg f arii i j s all w t ait a y s ia abbi r ia A ir ip i 07 4 AC man J i 2 main table floor ohio copper mill ph to 6 y harr possible and driving begun for the point where the foot of the incline should be at this point raising was commenced to meet the force sinking from above and when connection was made it was found that the center lines of the two portions of the shaft absolutely coincided this survey was made by frank goodman the com pany banys s engineer and checked by john bergh felix macdonald the mine superintendent had charge of the mining operations the ohio mill will be the third large one built to make a shipping product ot 0 the low g grade rade oreg ores of bingham and it will dif ferero fer from m both of the others as radically as they differ from each other this is due to the facts fact that it treats a different class of ore the values of the ohio occurring in a quartzite formation and in particles of sufficient size to make unnecessary the preliminary fine crushing essential in treating the porphyry of the boston Congoli consolidated dated and utah copper companies this mill is built at lark feet from the portal of the mascotte tunnel through which the ore will be run out in trains of thirty cars pulled by an electric motor the mill building is feet long and feet wide and the first feeling the practiced mill man has on entering is of admiration the building the work of the minneapolis steel machinery company is of the usual steel frame with a heavy corrugated iron sheathing the walls are full of windows and there are plenty of skylights in the root roof dispelling the faintest suggestion of gloom in the interior the floors are all of concrete with gutters to carry off all water a very desirable feature in a plant where it is unavoidable that water should sometimes in considerable quantities be splashed about the mill has a capacity of 2250 tons per day while the crude ore bins have stor age for tons there are two of these bins which receive the ore as dumped from the cars which are run up a 1200 foot trestle over the tops the bins are of double mels each of which sends its oversize to W a inch blake discharging to an elevator eb which dumps into the crushed ore bins the coarse crushing department is I 1 in set two units the other being identical with TD the one just described the fine crushing tt and concentrating departments are in four tur units only one of which will be described e as with one exception to be noted they de are identical there are two of the crushed t 0 ore r e bins to the complete mill each of then them do feeding two of the concentrating units byis by two automatic plunger feeders this feed el passes successively through two tromm els 11 the oversize from each going to a set of gates crushing rolls the product from N each set of rolls is elevated and dumped h into the second the second of these two has punched holes about one tenth of an inch in n I 1 diameter so that all of the feed which passes this and goes through the mill for treatment he is of comparatively small size this I 1 undersize goes to a revolving distributor in tri butor which is simply a tub three feet in lu diameter provided with a spout for of ng the ore this spout passes over six different launders and thus keeps the feed evenly distributed among the six classify classifiers ers let on the jig floor to which these launders plo run IT on the jig floor are eighteen double two tel I 1 compartment hartz jigs arranged in sa s1 sis douba rows there is a classifier classi fyer to each double 11 jig thus making three to each row and giving each double jig its own particular 1 size of feed these classify classifiers ers are of th the ei e 4 al U A L 7 rm rm le vt 6 at te slime plant ohio copper mill photo photes by bj harr harry Shi flir J J two inch plank and have flat bottoms which are cheaper to build and maintain than the hopper bottoms and afford storage room which can be used in an emergency the ore runs out of a gate in the front of the bin over a grizzly to a in blake crusher r after which it goes to two type known as the lake superior brou trou trough separator one not often seen in this coun try but very effective for the hydra hydraulic ull b classification of the coarse sizes of or ore t suitable to this treatment the jigs make e a clean concentrate in both compart compartments eat and discharge all over the tal tail board to an elevator which dumps into the chilian mill bins on the floor below there are four chilian mills to each unit H set get well above the floor on concrete piers these thes mills are seven feet in diameter of the well known Mo type manu manufactured fae by the trent engineering and machinery company of this city which also designed and furnished the blake crushers it is expected that three of the mills will do all of the grinding and a fourth has been installed merely to assure the output being kept to the maximum in case of a mill being siut s iut down for repairs the discharge from the mills goes to a launder running underneath the bin and carrying the overflow over flow from the last classifier classi fyer below the chilian floor are five table floors the first three of which are identical in equipment and purpose the launder just mentioned dividing its feed equally among them each floor has eighteen welfley tables arranged in two rows of nine each I 1 and to each two tables is a rectangular wooden box receiving its portion of the feed which it in turn discharges to the tables these boxes taper from top to bottom acting in a measure as settlers the overflow running to the slime plant which will be described later the wilfley used are a combination of the two better known models having the deck of the no 5 and the head motion of the no 3 in one unit james tables are being installed on the first floor as an experiment these tables have given good satisfaction in some of the smaller utah mills notably the red bingham and are to have a I 1 trying out at the ohio on the fourth and fifth wilfley floors are nine tables in a single row the tables on oil the fourth floor will be used to treat the from the floor above it has been found advisable in the preliminary tests not to try to make an absolutely clean product on the tables at one operation so all concentrates cincent rates from the first four floors will be retreated on the nine tables on the fifth will make only concentrates and mid bilings the with those from the fourth floor going to a centrifugal pump aich will discharge them to the elevator 1 receiving ece iving the jig to be reground a 11 the chilian chil lian mills the clean finished concentrates run to an elevator that dumps hem eni into a series of bins at the tail of the nill W A standard gauge railroad track runs long these bins inside of the building so hat the product goes direct from mill to nelter without about feet from the mill just the edth of the duplicate of the present plant aich it is planned to install is the slime lant ant so located that all feed will run to t L by gravity the building is feet f the same construct constructor on as the mill and aerated in two units one of which will be eser bed the other being identical in equipment and operation the feed is the overflow from the tanks beding the Wilf leys and the headwaters from the tables them selves the feed goes to one large distributor which feeds three others in each unit each of these in turn distributing among twenty four callow tanks there are thirty six wilfley tables in two rows of eighteen each being fed by two callow tanks the tailings from these tables are rejected and the headwaters go to a a row of eighteen cal low tanks on the floor below on which there are six buddies or round tables each of which is fed from three tanks the buddle buddie is rather a novelty in uta iasa i as a slimer it consists merely of a smooth round deck sloping from center to rim sixteen feet in diameter revolving slowly while the pulp is fed at the center and concentrated by a spray of wash water the concentrates Tates in the slime plant run to a separate building where they are elevated to bins beside a railroad track as in the concentrator the bailin tailings t s run to a gulch which affords ample dump room for years to come the water from the tailings run further down the gulch to a dam from which it is pumped back to the mill for rense the main water supply comes from the mascotte tunnel the telluride power companas comp anys lines run ran right by the plant and will be tapped for power which will be transformed at the mill from to volts mr james macfarlane president of the company and an engineer whose ability is beyond question has given some figures from which an estimate of production can be made before the crosscut cross cut from the mascotte tunnel reached the ore the assays essays from over 2000 samples showed an average of 1606 per cent copper the crosscut developed ore better than per cent so an average of 1 65 per cent or 33 pounds of copper per ton may be considered conservative the mill has a capacity of 2250 tons per p er day but as a plant which runs continuously must make its repairs on operating a time we shall assume an output of 85 per cent of the rating or say 1900 tons per day assuming a concentration of eighteen to one an extraction of eighty per cent and a smelter loss of fifteen pounds of copper to each ton of concentrates we find eighteen tons of ore producing pounds 0 of f copper this will amount to pounds per day or 17 pounds per year allowing five full days lost time not taking into consideration the original ground but allowing only for ore actually exposed the mine has tons in sight sufficient to maintain the production just estimated for a period of twenty years to to come even if not a single stroke of development were to be done which of course will not be the ease case so truly another powerful factor has arisen to aid bingham in maintaining her proud title so justly earned the old rel reliable lable |