. Transactions. section on center line Fig. 17.—Plan and Elevation of No. 1 Furnace. Steptoe, McGiLL, Fig. 18.—Plan and Elevation of Furnace and Smelting & Refining Co. 806 CHEMISTRY OF THE REDUCTION PROCESSES. Chemistry of the Reduction Processes in Use atAnaconda, BY FREDERICK LAIST, ANACONDA, MONT. (Cleveland Meeting, October, 1912.) The ores received at the Washoe Smelter come almost en-tirely from the mines in Bntte and contain the following min-erals : Chalcocite, Cn^S; covellite, CnS; chalcopyrite, CuFeS2(trace); bornite, CUgFeSg; enargite, Cu^AsS^;

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. Transactions. section on center line Fig. 17.—Plan and Elevation of No. 1 Furnace. Steptoe, McGiLL, Fig. 18.—Plan and Elevation of Furnace and Smelting & Refining Co. 806 CHEMISTRY OF THE REDUCTION PROCESSES. Chemistry of the Reduction Processes in Use atAnaconda, BY FREDERICK LAIST, ANACONDA, MONT. (Cleveland Meeting, October, 1912.) The ores received at the Washoe Smelter come almost en-tirely from the mines in Bntte and contain the following min-erals : Chalcocite, Cn^S; covellite, CnS; chalcopyrite, CuFeS2(trace); bornite, CUgFeSg; enargite, Cu^AsS^; malachite,CngCO^ + H.,0 (trace); pvrite, FeS.,; sphalerite, ZnS; rhodo-chrosite, MnCOg (less than 1 per cent.); rhodonite, MnSiOg(less than 1 per cent,). The country-rock of Butte is of the granite family and is aquartz-monzonite containing a little less silica than typicalgranite. It is made up of the following rock-minerals in ap-proximately the proportions indicated: Minerals. Composition. Per Cent Quartz SiO, 20 Andesine h XaAlSigOg; h CaAUSi-A 42 Orthoclase KAlSiaOg 23 Hornblende ^ Ca(MgFe)3SiA

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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries