Show 1 i I i j IMPROVED 1 MAD ADE fOR RECOVERY ot Of lOW CRADE ORES Metallurgists agree that th thuG there re are many lany improvements to be made mede over the 1 present pies pres 5 cut ent Ent m methods of extracting the tho values a lues from the low grade gede 01 om e es cc An th object lesson has hasen hasteen teen been en furnished b by the ei operations ra Hons in Bingham Bing Bing- ham harn where whee a low grade porphyry copper copper copper cop cop- per ore carrying values alues of less thin tn 2 I Iper per c cent nt and in itt some instances an averga aver aver- ago ga of about U 11 19 per cent el In the h red metal bt btU Y at ath rr is made to pay large p pel profits to o the e own own- er ers Two illustrations of tn th these s s' s splendid propositions are found in Utah Copper and Boston Foston Consolidated both of nt which hat havo b en placed on a substantial paying batla batis balls f for r months This has haa ben been made possible possible bl ble by Improved metod methods in segregating a 5 high percentage of the precious metals from rm a a large tonne of rock rok which in il addition to lt its all values n In tn copper some m gold silver and lead in Euf sufficient cent quantities to pay a large proportion of th the cost of mining a and ami commercialization Long bt before foro these porphyry mines wr were wre looked d upon by mining men inca as possible bread brad winners winne experiments wet were made mad with Ull A number of processes The most notable instance of this kind wet was a the Copperton plant which at a cost cst of al almost almost ci- ci most on one million dollars was s I operated rated and altered alered for months b before Core practical methods meth met met- os were worked out for or getting the best heat results As a lt of f th these se experiments plans were ere form formulated for fOl the construction construe construe- tion and commissioning of tho the mammoth reduction plant of the Utah Copper company company com com- pany at Gar ld Following this expert P I Jany ment was the one made by Metallurgist A A. A f Bettles with the tho stamps which r resulted i n in itt the construction n f of the Boston mill mi at a plant which IsId is said Id to make on one of the th-a th highest savings of all aU Yalu values s of any milt mill mi commissioned up to that time The last reduction t n plant to be hull built buu f and amid placed in operation on the the low lo grade rade copper r ores cures ore n of ef Bingham la is the th Ohio plant at I Lark Lark- lArk ark ThIs Thia n nw new w mill has haH had the usual lual number of problems to work out since e it was S started a I few weeks Reeks f ks ago aJo and added to t this hive have been e the tho exceptionally dt rn i cold d weather a conditions dl let Tet t through It I all al th th th tally taly sheets hEpt bE begin ln to toPI tow show chow w something e of the possibilities i of this PI plant which j h differs in construction t from frem the th two ti other plants chiefly on the principle of depending largely ly on the roll system tem for crushing the crude ore While this mill mm i H is still sti stew new ne and ami it I is not an easy matter matr to get set ami n account account ac cc- count of the savings the returns show how that 3 as much aa ac at 23 21 5 per Jer cent t nt copper is re recovered recovered re- re coYt covered in the concentrates concentrates' Since the first t unit has ba h been placed In try dy commission corn com m mission this hl hIgh h average of f ln A saving is being made without the tho sl slightest trouble trou ti-on- trl- trl ble bl and arid this thi shows show that improvements are me being bim made mado in II tbt methods ls of recovering ering alu values and that there Is I. I still room rom for further along this line |