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vertically and one inch horizoadtelloYf <br />The tunnel has an average g <br />3%sloping down to the mine. Unfor- <br />tunately, this requires that loaded <br />ore trains must ascend to the mill <br />elevation. To reduce net power re- <br />quirements, however, some haulage <br />power is supplied from regenerative <br />braking through the traction motors <br />on empty ore trains returning to the <br />mine. <br />The rail system was designed <br />for fully automated, computer con- <br />trolledoperation. Six ore trains, con- <br />sisting of four electric locomotives <br />and 26 ore cars each, make the 1 t/z hr <br />round trip at an average speed of 25 <br />mph. Each train load will contain <br />about 600 tons of ore. <br />MiIllCancentrator <br />Upon arrival at the mill, ore cars un- <br />load automatically and continuously <br />through hinged car bottoms into a <br />54 84 in gyratory crusher. The -9 <br />in product from the crusher is trans- <br />ferred to a large storage bin by <br />means of a conveyor system. A sec- <br />ond conveyor system carries ore <br />from storage to the primary mills. <br />Again because of the physical <br />properties of the ore, semi-autog- <br />enous millinq_was selected as the <br />best method for final ore break- <br />down. Three 28 ft diameter by 14 ft <br />long semi-autogenous mills will be <br />used when the mine reaches full <br />production capacity. At present, two <br />are on stream. Two-, three- and <br />four-inch balls were charged ini- <br />tially,although subsequent make-up <br />will be in the form of four-inch balls <br />only. <br />Ore processing proceeds by the <br />conventional milling-flotation/ <br />concentration system shown in the <br />flowsheet, the product being stan- <br />dard grade 91% MoS, at 325 mesh. <br />Additional upgrading can be <br />achieved through either further mil- <br />ling and flotation or through a 16 hr, <br />185 F leach in 5%HCI to remove lead. <br />Product is packed in drums and <br />trucked 35 miles to a railhead at <br />Kremmling, Col. From there, it is <br />Flowsheet for Henderson Concentrator. Lead leach and Grade B" circuits not shown <br />i4rnx <br />34 in <br />J~usher 28timx14ft5 <br />autoyenousr' <br />F locculanl <br />hme <br />~~~• <br />~ <br />l `~ Stockpile <br />o- <br />)TPD1 <br />3 x 1935aT <br />L'Ve ore 51Or dyE' <br />- 65% - 100 Mesh teed <br /> ~ I <br /> Pump hox J <br />~ flst Reynnd <br />~ Reagents <br />gents Rougher L xentra Sodwm <br />}lotatron <br />- _ • ~ ,_,~~tnide <br />1 <br /> st Cleaner <br /> Reagents' Rf~,jyents <br /> -- + ?nd Regrind <br />COnCCnVJtf. <br /> Sodium cyanide - <br /> <br /> 2 nd Cleaner <br />r- <br /> Reayenls <br />3rdR?yrurd <br /> r Concentrate <br /> Reagents Sodum r ydnide - [ ~nr,~n <br /> <br />i 3rddeaner 4th rlnr. T~y~<,feE?•~i•~uil <br />'~ <br />i,i~ is $odEUm <br />,-yanrdc ' Re3~~r~•r~iti <br />D~'.. 1iIL r-~ <br /> Cnnciit~onrrs- ~ ~ <br /> To lertt~ e,r h ~ ~r, ~u~t ~ o <br /> i aria imi mii iim iim iiii im <br />21F~y <br />holding t inks <br />un~~'~~Itcu, <br />91`i: MoSp <br />2 ~ ?:90T <br />~~ k' a u; <br />Main flotation room <br />