[7] Translated from Zeit. f. Berg.-Hütten-und Salinenwesen, LIII (1905, p. 450).
[8] This paper is published in pp. 148-166 of this book.
[9] Abstract from Transactions of the Australasian Institute of Mining Engineers, Vol. IX, Part 1.
[10] In the course of subsequent discussion Mr. Horwood stated that the losses in roasting were 12½ per cent. in lead and probably about 5 per cent. in silver. As compared to roasting in Ropp furnaces the loss in lead was 5 to 6 per cent. greater, but the difference of loss in silver was, he thought, not appreciable. Mr. Hibbard said that the Central mine had obtained satisfactory results with masonry kilns.—Editor.
[11] Abstract of portion of a paper presented at the Mexican meeting of the American Institute of Mining Engineers, under the title “The Mechanical Feeding of Silver-Lead Blast Furnaces.” Transactions, Vol. XXXII, pp. 353-395.
[12] Abstract of a paper (“The Mechanical Feeding of Silver-Lead Blast Furnaces”) presented at the Mexican meeting of the American Institute of Mining Engineers and published in the Transactions, Vol. XXXII. For the first portion of this paper see the preceding article.
[13] Abstract of a paper in Western Chemist and Metallurgist, I, VII, Aug., 1905.
[14] Much better work is being done at present, smelting the Western zinc ores, and the residue contains about one-third of the above figure, or 7.5 per cent. of zinc oxide. The high per cent. of ZnO left in residue was mainly due to poor roasting.
[15] There was also considerable coke used of an inferior grade, made from Kansas coal.
[16] Part of the ZnO in roasted matte came from being roasted in the same furnace the zinc ore had been roasted in.