Arizona weekly enterprise., 1888-03-17

mand l therefore ceased the treatment of first class ore by the method in use, on October lst, to experiment. on a work
 ing scale for the determination of details
 for a new method, and also to further develop the new ore found ill the mine, which has opened up so favorably, and provide the new means for operating 1t
 through shaft No. 3. Tie 484004 ton
 treated; produced 150, ,295. 90 ozs. fine is bullion, showing an extraction of 96 39 per cent. of the silver contents, as based on the value of the roasted pulp, and ill
 weight, as given in the foregoing figure The average working loss was 1.70 ozs. silver per ton, of ore treated, and the average consumption of quicksilver was
 1.62 pounds per ton. When the fine ness of the bullion fell to d low figure,
 portion of an old lot of argentiferous lead bars (the product from the re- duction of rich cupel lithage some years 1 ago. was re-melted, and much of the silver run in. The recasting gave shipment of ffty-six lead bars, noted in my accompanying statement.
 In the treatment of second class con centrates i'll Mill No ?. there were worked total of 1913 51 tons, of which l 1051. 30 tons were the Vanner concen- centrationsfrom Mill No. 1, and S62. 21 tons were old ''sluice concentrates, :" the last of that material on hand. After drying the mixture of the two classes of material, 1t was passed through small
 set of Cornish rolls and screened, the
 salt used Ill chlorinating being added
 here to the amount of 3k per cent. The ore, reduced ill fineness, was then sub- l jected to roast chlorination in charges of about three tons, the average time of l roast being eight hours. The pan treat
 ment occupied from three and halt to
 i've and a half hours Frequent trials proved that nothing was gained towards l a higher percentage of chlorination by submitting the ore to longer roast than eight hours, or by adding larger per
 centage of salt. The average of the
 chlorinatfon assays obtained was All per cent. Native silver was doubtless pres
 ent at times. The prod uct was, 35, ,331 IS
 ozs. fine silver, showing an actual work
 ing loss of S. l9 ozs silver per ton, and an
 extraction of 69. 26 per cent of the silver contents. The ore would be classified
 as rebellious, and carries a large per
 centage of zinc blende, 1t being the
 chief argentiferous element present. 1 The average consumption of quicksilver
 was 1.46 lbs per ton of ore treated, and
 the average fneness of the bullion was
 800. As the production of second-class
 concentrations, in Mil No. l, averages scant four tons per day, 1 temporarily
 suspended this treatment Nov. 1st, to
 permit an accumulation of the mater ial
 for steady run to the full ca pacity of
 the roasting furnaces. as matter of
 economy. During the last three months
 of the year, l have utilized all the spare
 pan capacity of the mill, in the treat
 ment of old, 'white tailingso by rapid
 raw amalgamation, the low value of the
 material not permitting roast-chlorln-
 alton. As these sands have been weather- ing for some seven years, they have ur-
 dergone considerable decomposition.
 The total amount treated was 3875. 34
 tons, of an average value of F ozs silver
 per ton. It was found that the use of
 copper sulphate did not materially assis!
 anna lgama ton, so that chemicals were
 dispensed with. The amount of salt
 used in the pans was onc-half per cent,
 and the time of pan treatment was re-
 duced from three and a half hours to two
 and two and half hours. The product
 was 27. .35O. 49 ozs fine silver, the bullion
 bars assaying .658 fine, average. The
 average working loss was f. 23 ozs silver
 per ton, Beverage tailing assays f. B. ozs.
 showing an extraction of 625 per cent
 Summarizing, the total amount of ore
 treated in Mill No. was 10, 628. 89 tons
 wito production of 214, 1S2. 92 ozs fine
 silver.
 The fuel consumed at the mill was 727O cords of wood, of which 5070 cords were for steam. There are now 65.
 cords on hand on the mill yard. I vii
 here mentor that to effect an economy Il
 steam fuel at the mills, vertical com pound condensing engine has recently
 been built for us by Messrs. Fraser and
 Chalmers of Chicago, H., of 175 H. P.
 and the work of preparing the foundation , for 1t IS now in progress. It Is expected , that it will be in operation about the
 middle of February, when the use o } four high pressure non -condenslng en
 zines will be dispensed with, and d con | seouent large economy Ill fuel effected. To experiment. on the treatmemt of tht f 25O level ore by lixlviation, two teaching l and two precipitating vats, with ad 3 iuncts, were advantageou set up, anC , about fifty tons of ore have been leachec 7 --much of 1t being the most highly GU , priferous ore to be obtained. The op eration has been satisfactory, and gen v eral method of treatment determined a Considering the large ore body now ex- n posed on the 119 and 250 levels, and it | general character, have felt justified il ) proceeding with the preliminary work o 7 resetting the old hxiviating plant, ant e arranging for such additional appliances : as will handle forty tons of ore per day e Towards the close of the present month | I shall hope to have over half the plan e in readiness, and with the opportunitie @ of the three systems of metallurgica 0 treatment, I shall anticipate a large l. output of fine silver than at any tim Z heretofore The entire milling plant wi |, be in operation on the different classes ( s material we have at hand, and any nota # able variation in the character of the or a in the upper levels, will suggest tn l. mode of procedure. As We have ol 1 hand in the old lixiviatipg plant, sufiicier a material with which to construct abou a seven-tenths of the new plant, the cos e of introducing it will be small:
 h Our water works, about three mile Il from Pinal, were further improved dur l. ing the year. A new timbered we'll W; e sunk to tie bed rock, and timbere IT drifts run along the bottom each wa