HAVING held for some months, in 1913, the position of metallurgist in charge of the flotation department at Mount Morgan, it occurred to the writer that a description of the research work that he carried out on that ore would be of interest to members of the Institute. The Mount Morgan ore is virtually a mixture of iron pyrites, copper pyrites, and gold in a quartzose gangue. There are two types of ore broken in the underground workings - smelting ore containing 40 %-50 % silica, and ore too siliceous for economical smelting. This latter type of ore was treated by flotation, an approximate analysis being - Copper..2.0 % Alumina..1.5 % Iron..10.0 % Calcium carbonate, Gold..5_x000D_
dwt alkalis, &c..3.5 % Silica..73.0 % Sulphur..10.0 % or, dividing the ore approximately into component minerals - Copper pyrites..6 % Iron pyrites..16 % Quartz calcite, &c..78 %. This analysis is only typical, and does not represent the average assay of the class of ore.