Journal - South African Institute of Mining and Metallurgy . demand for such aoachine is even more weighty than at Waihi,or in Western Australia are 50 per comparing costs and efficiencies of the Or, say, 4 .Id. per ton treated. At the Waihi,this means a saving of Is. .>d. per ton of slime ascompared with the Johnson presses. So conclusively successful has the coincidentintroduction of tube mills and vacuum filtersproved upon the property- and it is necessary tobear in mind that the product of the tube mill asat present dealt with includes a quantity of finesand which p
Journal - South African Institute of Mining and Metallurgy . demand for such aoachine is even more weighty than at Waihi,or in Western Australia are 50 per comparing costs and efficiencies of the Or, say, 4 .Id. per ton treated. At the Waihi,this means a saving of Is. .>d. per ton of slime ascompared with the Johnson presses. So conclusively successful has the coincidentintroduction of tube mills and vacuum filtersproved upon the property- and it is necessary tobear in mind that the product of the tube mill asat present dealt with includes a quantity of finesand which passes the spit/, and finds its way tothe slimes plant—so favourable have been theresults of lengthy experimenting and practicalwork, that the controlling heads are alreadybeginning to speak in an undertone of the practic-able extension to a far greater scope of fine grind-ing and filtering : in fact, to use the magic term,all sliming. The question is beyond thelimits of this patchy contribution ; but it isone which cannot well be judged by TWO BASKETS, Willi NINE FRAMES KA learn that there are even no grounds for con-roversy on the matter The presses will soon be:ornpletely ousted. At the Waihi mill, wherehe filters have been used for several months, 220ions of slime are put through per day by meansif two The installation cost about£4,000. Labour requirements are three men,me per shift, and the part services of a costs arc :— Three men at 8s. ...Cloths at id. per ton treatedPart services of fitterTwo vacuum pomps(17 )Power for pneumatic agitation 2d. Per <lav24s. 9s. 10s. £3 16s. 2d. Tn conclusion, it may be noted that the richconcentrates won at each mill, by vanners at theWaihi mill fiom fine and coarse sand, and byWilttey tables at the Victoria from only theheavier sand, are
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