Canadian mining journal July-December 1915 . talled, with the result that(b) Sp. gr. of ore Average weight of Mfi the earlier determinations were confirmed within 2 perbuckets of 5 gal. = lb., or lb. per cent. cu. ft. pulp. Average sp. gr f pulp , A statement of operating costs at the slime plant is whence 1 cu. ft. contains lb. dry sand, appended. This plant was the pioneer of its type. It 432 THE CANADIAN MINING JOURNAL July 15. 1915 is interesting to note that the presses are now practi-cally as at first designed, and that the process, in itsessentials, is un
Canadian mining journal July-December 1915 . talled, with the result that(b) Sp. gr. of ore Average weight of Mfi the earlier determinations were confirmed within 2 perbuckets of 5 gal. = lb., or lb. per cent. cu. ft. pulp. Average sp. gr f pulp , A statement of operating costs at the slime plant is whence 1 cu. ft. contains lb. dry sand, appended. This plant was the pioneer of its type. It 432 THE CANADIAN MINING JOURNAL July 15. 1915 is interesting to note that the presses are now practi-cally as at first designed, and that the process, in itsessentials, is unchanged. Certain refinements in thepress design have been dispensed with as unnecessary;a study of the operations has made possible some sim-plification and systematization, which have made itpossible to reduce the costs each year. Low-Grade Precipitate UEAD-LIN ED VAT FILTER PRESS Higti-fTmdc Precipiftc Water andSulphuric Acid Waste ^Liquor -(Out) STEAM DRIER BRIQUETTINQ PRESS DRYING FURNACE FluxBorax-Slag SilicaCoke and Litharge i. Matte - Lead Bullion Lead Bullion Matte J CUPEL FURNACEOperation continuedwith oxuiatlou of leadand withdrawal of litharge Gold and Silver Cupel(Melted and Shipped) lotto m Litharge (groundand used for Flux) Slap PlusPynte-CokeLimestone (Shipped)t-Matte ?| BLAST FURNACE (- Lead I ulLion CUPEL FURNACE !!ag-» (Out) (By-product Run) Gold and Silver(Melted andShipped) Cupel Bottom(Returned to sub-sequent BlusfeFurnace Hun) (.-e((rround .aud used for Flux) Refining of Precipitate at Homestake. Unit Consumptions per Ton of Slime Treated. Sodium cyanide . .. lb. Zinc dust lb. Lime Hb. Hydrochloric acid .. lb., costing $ per ton kw-hr. Precipitation. The Merrill system of precipitation with zinc dustis used at all cyanide plants, as is the Merrill filterpress of triangular section. This method has beenfully discussed in the paper already cited, and thetechnique remains about as there described. It ha
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