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<br /> <br />• 2. Sorting Circuit for Approximately -2, +1 inch ore <br />A. Mechanical Equipment <br />Feeders <br />Two vibratory feeders similar to Syntron Model F-45E; one feeder trough is <br />fitted with grizzly bars for the removal of rock chips and the second is <br />equipped with corrugations. The voltage required by the feeders is 440 V <br />60 cycles. <br />Sorter <br />One Radiometric Sorter consisting of a mechanical self-supporting structure <br />for the support of the sorter components. The sorter is equipped with six <br />channels capable of discriminating between radiometric ore and the non-ore <br />bearing waste rock. <br />Ore from the vibratory feeders is conveyed through the sorter on a nominally <br />36 inch wide nylon woven belting with polyurethane cover top and bottom and <br />travelling at about 200 feet per minute. <br />The return portion of this belt is equipped with belt cleaning facilities <br />supplied by Ore Sorters, Ltd., and is connected to a water line. <br />• The washings from the belt are discharged below the sorter into a washings <br />conduit. (Figure 3.1-1) <br />The conveyor belt is driven by a 3 h.p. 440 volt 3 phase motor throu~3h a <br />suitable gear reduction mechanism. <br />Each channel of the sorter is equipped with three blast valves for the <br />deflection of selected rocks. <br />B. Electronic Equipment <br />Gaimna Ray Detector <br />Each channel is equipped with one per channel, 2 inch diameter by 1 'nch thick <br />NaI(TI) crystal optically coupled to a photomultiplier tube of a typf~ similar <br />to the "Integral Line" type 'S' supplied by the Harshaw Chemical ComF~any. The <br />scintillation detectors are housed in a removable drawer within the main lower <br />lead container of the sorter. <br />The pre-amplifier, amplifier and gamma energy discriminator for each channel <br />necessary for acquiring ganma ray counts are also part of the gamma ray <br />detector system. <br /> <br />1 -5 <br />