Show on LT N PROCESS IS M MAKING KING SUCCESS j f OF f lOW GR GRADE DE TREATMENT with George Ceorge H. H Holt who WiO F. F tO is making a success of ot Fn of f this elt city em Klines nu Operating plant at Park CUy written a It detailed ln le account of or t the e err i new which has been treating the tie nii- nii oca topes slopes of the Ontario mine In 8 n theold aix to lo fourteen oun ounces es eser carry ue tile two IWO pounds copp copper r. r 01 oi to lo toS tois to ver er er one is 15 S ounces gol goli n nd s. s mall J percentage zinc line inc The Thc treatment consists lead d and with coal dust dusti Q the crushed ore and then in a new type nd i salt It furnace turn ce by combustion 0 ui nt t the e contained l l. The roasted ore oro is lc ned with an anId anid kid Id solution to dissolve the sliver aUver cop cop- and nd lead and ond the these e metals arc are r r. r gold void together er with scrap crap Iron and anu e product in this form torm sold to the reli re- re li roasting acting process ces Is the lie feature In InIS IS treatment nt plan Illan and mu makes maies cs possible lie fee e of ores without an any loss baa f tho the valuable metals mewls at a ver very low cost his ilita routing rousting process had It UK ita beginning connection a-connection with UIO thO research work In he University Um of Utah mines department nd- nd N. N C. C Jr VILS largely for Tor or working out of this iMa roDI m. m while making makin exp experiments with ii no he base baSIS gold Bold ores or the old Mercur nine itne After Installing a Q small test plant Mercur properties Christensen dl dlo- dlo of ills hitS Interest to lo II n. Dern nd cid a A considerable amount of or experimenter experiment experiment- V er was conducted at t the Ontario mine wore tho the present system of roasting was vas upon The he I leaching process Is Vcr very simple a 11 Button ullon being made of soluble salts from addition about ic roasted ore Ole carrying In lur Jur pounds of free tree acid The rie acid Is In supplied from the cond condensed rOl roaster ler mice the remaining being added from acid At such times limes as the ore Lilies a considerable percentage of pyrite extra acid add I Is required In conclusion f. f 1 r-HoiL r Holt Holl says The Tho roasting routing process Is not nol limited to to but may be advantageously plied to oxidizing gold old ores for lor cyanide and oxidizing and ores for tor subsequent leaching However cr it Is la our au opinion that the time st favorable or Held of ot application Is In III roasting In this class of ot sating we not only have ha the benefit benent of ot caper operating cost cOstS but in addition vo ye overcome the volatilization loss bose ilch mith In the time past has be been n a serious dUll dUll- It ty W Wt hAve test tested l out samples of ore orem m rn eight different mines mimics These vo Ye given hen us a large variety of ot ns Pus Iti In Inmany man many cases the recovery of gold Jold ver vcr and copper has bias been well above 90 r I cent Tho The Ideal combination wo we ma may is le a a. siliceous silver copper-silver ore B C to 10 per cent pyrite and arid fa- fa a- a located with respect to a salt sait sup- sup Under such auch favorable conditions the tire cost of oC milling In iii a well de designed tnt LOt will be bo less tha than n 1 I per Ier ton on on basis of tons Ions per lay dllY When When the 3 J carries gold It Is Is necessary to lo carry carrye e e a chlorine In the time leaching solutions notations und and ands is s adds a few cents to tho cost of treat treat- nt i Ores high in silica ca iron and manga- manga se readily A small percent percent- is a of limo does dOM no harm as It Is readily In the time roast A large percent percent- e C however howe Is detrimental |