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Show The Story of Milling and Smelting at Midvale Midyai - , - , zy , i i'I i ilY lY 'I I ' pi pi0l 0l y yr yd # d , r 0 0s s t ti te ta e a N i W 1a ' " 1 1W s r rs . 4 4t 1 + r t r a aLarge Large grinding units In the MJdvale Midvale , Utah mill of the United States Smelting Refining and Mlnln Mining ; CO/llo CO llo COllopany eo / > 4 4pany pany grind the crude ores Into pulp to free the metals Fed Into these units is ore from the . compan companmines comprnys comprnysmines 'II II ' mines and that shipped to the plant for treatment on a custom c atom basis _ Editor ( * ( Editor * . Note 1'h 1h Thu ' Thu . is i , . the . iccond .econd econd second of aler aerica a tttCT erica , ler [ . of o ( fiv fivt five . art da cleo oleo on the itory ltory story of mul mill millmg millvna . mg and melting Imeltlng emdting of lead zinc ore at atJ4 atM atU J4 M dvale dv Ie J ) JIn In early Utah mining days therewere therewere there were some outcropplngs outcroppings of o ( rich ore orebodies orebodies orebodies orebodieswhich bodies -which which - made many small smalloperations smalloperations smalloperations operations practicable and prollta proita proitable prolltable profltable ble However the picture changed changedconsiderably changedconsiderably changedconsiderably considerably with the exhaustion of ofsuch ofsuch otsuch such outcroppings outeroppings The search for fornew fornew tornew be became became became new ore bodies quite generally came the task ot of larger companies companieshaving companieshaving companieshaving having finances ifnances and organizations organizationsadequate organizationsadequate organizationsadequate adequate lor for the costly tedious and andmostly andmostly andmostly mostly disappointing work ot of ex examlnlng examining examining amlnlng amining drilling and developing developingmine developingmine developingmine mine prospectsThe prospectsThe prospects prospectsThe The United States Slates Smelting ne Re nefining Refining liefining fining and Mining company entered enteredthe enteredthe enteredthe the coal coat business through the Unit United United United ed States Fuel company at Hlawatha Hiawatha Hiawa Hlawa Hiawatha tha Utah Incorporated In 1915While 1915While 1915 While ita its Midvale Mldvale lead smelter was treating company company'and companyand ' ' and custom customores customores customores ores the United States Smelting SmeltingRefining SmeltingReftning SmeltingRefining Refining Reftning and Mining company can con cantlnued continued continued tlnued tinued wor work tor for the advancementot advancementof advancement of metallurgical practices ThIs ThIscompany Thiscompany Thiscompany company Is generally credited creditedwithleading with withleading withleading -withleading withleading - leading out in the application appllcatfon of the thebaghouse thebaghouse thebaghouse baghouse method ot of catching metal metalparticles metalparticles metalparticles particles which were formerly lostin lost lostIn lostIn In smelter tumea fumes fumesFor fumesFor tumeaFor For many years the large and andsmall andsmall andsmall small producers ot of ore In Utah and andthe andthe andthe the west who shipped to the smelt smelters smelters smelters ers received no pay tor for far the zinC zinccontent zinccontent ' content ot of the ore but were penal penalIzed penalized penalIzed Ized because ot of the inability of the thesmelters thesmelters thesmelters smelters to economically separate separatethe separatethe separatethe the zinc Tflls TJ1ls Tills company was instrumental In Instrumental Instrumental strumental In solving this vital vitalproblem vitalproblem vitalproblem problem with the result that a vast vastamount vastamount vastamount amount of Utah low grade sulphideore sulphideore sulphide sulphideore ore previously worthless became becamecommercial becamecommercial becamecommercial commercial ore Thia This w was a s accomplished aceomplfshed fint dnt Urnthrough fintthrough dntthrough through the nae u"e ue use " ot of electrostatieiep electrollatl electrostatlineo.aratlon electrostatlineoaratlon ! le . f faration aratlon aration at the Midvale Mldvale Plant alt sad iu ! > b iulater altiater blater later iater flreftelecUTtflotation ftrst.selecUnflotation selecUnflotation In 1918 the ftrst.selecUn ftrstselecUn flit . selecUn flotation plant 111 hi m the United S 84ttp 84ttpwas Statewas eI ! eIwas was built by a subsidiary unaywjoperating coml8J1 coulny coml8J1operating coulnyoperating % ! operating in an adjoining adoinng ) ( state slate d dpilot Apilot pilot plant operated opera.ted . BmscesaMly succeQuIb- succeQuIb eucceasfuIly ! - ! succeQuIbat eucceasfuIlyat at Midvale Mldvale was logically tollmrrt follDlred foliairsd 'oy oy ' by follDlredby foliairsdby the building ot of a crnBMng crushing plant plat platand plantand ilasiand and selective flotation JIotation concentrat concentrat- - - ing concentrating Mia-vatelead Mia vatelead Mldvaielead mill adjacent to tha the Mldva1 Mldvaie - & lead smelter tor for the treatmentit treatment of it the otthe ofthe itthe lead zinc sulphide orea ores 1I01t nse 1I01tcommercially nsecommercially BOHcommercially commercially valuableThe valuableThe valuable valuableThe The present Midvale Idvale dotattonmrconsists flolallon.mm flolallonmm dotattonmr flolallon.mmconsls flotation . afflconsists consls consists t9 of three separata separate strut strao straoturas truc-tures truc tures > - tures turas coarse crushing plant plaut tb the tinflotation tblIotatlon theflotation lIotatlon flotation mill Itsel Itselt itself ! and the tl thicken thickener cken- cken ckener - . er building The large flotation 1I0latlon mill millcon millcontains Billcontains con contains talns four units wita with a t01a1 total t01a1capacity totalcapacity totalcapacity capacity of o ( approximately appronmately 170q 17(11 1711 ( ; to tong tongof tonot of lead zinc sulphide ore per day I ( THE .THIRD THIRD TffiRD . 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