Show treats lower grade ures ores V e AAA il f W I 1 4 i az V I 1 il ra 11 9 1 X i qz x I 1 ea A M ks 0 4 A 6 A it plant at garfield during the vast past twenty years two factors have greatly changed the mining industry ot utah and the he change or ore available for the shelters smelters sm elters during the iho past twenty years tho the direct smelting smelling sm elting oxidized lead sli sil vor ver ore are was slowly depleted and changes in metallurgy wore feces flary eary As mining developed to deeper levels much complex sulphide oro are was wag developed and it wits waa necessary saty to add another complete practice in tho the treatment of this low grado grade ore this practice was selective flotation a mill to flimin ato AN the waste or gangue ganglia from the ore and sepa raio tile the metals the murray plant of the amer lean ican smelting smelling Sm elting refining ning company com was waa originally equipped with eight blast furnaces having a capacity of approximately 1600 tons per day tho the largest smelter in salt lake valley at that time today the murray plant smelts its entire tonnage through one blast furnace turna coi while this la Is du due a somewhat to improvements in practice the principal reason lies in the tact fact that the production ot of lead ores in utah is steadily declining this athla product reduction 1 on has haa been accompanied by a deci decline lne in grade and by increased mining costs coals the continuation ot of this trend will further reduce tonnages ton nages in the future the only check being further economies in ill mining milling transportation and smelting smelling sm elting during the past 60 50 years tho the utah mining industry has haa been successively ces forced to the production of lower grade ores and successively has haa faced increasing costs inherent in deeper work with no increase in tho the market value for its ita products changes in mining methods milling practice and smelting smelling sm elting practice havo have been necessary tor for survival the american Smelt smelling smelting Sm elting ingi J and refining Coin company pany well aware awara 0 of this from its past experience to la constantly endeavoring to ampro improve vo its smelting smelling sm elting practice |