─────────┬──────┬───────┬─────────┬─────────┬─────────┬─────────┐ │BLAST │ TONS │PER CENT.│PER CENT.│PER CENT.│PER CENT.│ │OUNCES│ PER │ PB. ON │ COKE ON │ SLAG ON │ S ON │ │ │ F.D. │ CHARGE │ CHARGE │ CHARGE │ CHARGE │ ─────────┼──────┼───────┼─────────┼─────────┼─────────┼─────────┤ Feb. │ 21 │ 42.5 │ 9.0 │ 12.0 │ 30.0 │ 3.7 │ March │ 21 │ 44.8 │ 9.7 │ 13.5 │ 37.0 │ 4.0 │ April │ 21 │ 43.7 │ 9.0 │ 13.5 │ 35.0 │ 4.3 │ May │ 21 │ 49.4 │ 10.0 │ 13.5 │ 30.0 │ 3.5 │ July │ 17 │ 41.0 │ 9.8 │ 12.5 │ 34.0 │ 3.8 │ August │ 18 │ 47.0 │ 9.3 │ 13.0 │ 32.0 │ 3.7 │ Sept.[17]│ 15 │ 51.0 │ 7.3 │ 13.0 │ 30.0 │ 2.8 │ ─────────┼──────┼───────┼─────────┼─────────┼─────────┼─────────┤ Average │ │ 45.6 │ 9.1 │ 13.0 │ 32.6 │ 3.7 │ ─────────┴──────┴───────┴─────────┴─────────┴─────────┴─────────┘ ────────┬────────┬─────────────────────┐ │ MATTE │ SAVING │ │PRODUCED│ AG AU PB │ ────────┼────────┼──────┬───────┬──────┤ Feb. │ 8.0} │ 84.4 │ 83.0 │ 90.3 │ March │ 9.0} │ │ │ │ April │ 10.0 │ 97.9 │ 70.5 │ 96.6 │ May │ 6.5 │ 95.6 │ 109.5 │ 88.8 │ July │ 6.0 │ 97.9 │ 90.0 │ 92.9 │ August │ 6.3 │ 86.2 │ 107.5 │ 87.6 │ Sept. │ 4.6 │ 92.9 │ 94.0 │ 95.6 │ ────────┼────────┼──────┼───────┼──────┤ Average │ 7.2 │ 90.8 │ 92.4 │ 92.0 │ ────────┴────────┴──────┴───────┴──────┘ I believe that, in smelting residues high in zinc oxide, better metallurgical results would be obtained by using a dry silicious ore in connection with a high-grade galena ore, provided the residue be low in sulphur. This was confirmed to a certain degree in actual practice, as the furnace worked very well upon increasing the percentage of Cripple Creek ore on the charge. This would also seem to indicate that alumina had no bad effect on a zinky slag. ZINC OXIDE IN SLAGS BY W. MAYNARD HUTCHINGS (December 24, 1903) From time to time, in various articles and letters on metallurgical subjects in the _Engineering and Mining Journal_, the question of the removal of zinc oxide in slags is referred to, and the question is raised as to the form in which it is contained in the slags. I gather that opinion is divided as to whether zinc oxide enters into the slags as a combined silicate, or whether it is simply carried into them in a state of mechanical mixture.