Comment
Author: Admin | 2025-04-28
In the new mill to assist in recovering the iron pyrite in the ore for fluxing and other purposes, two of these machines were placed in the experimental mill and some tests made to find out what results may be expected of them. Taking an average of several tests on ore from different parts of the mine, the grading of the ‘table feed’ was as follows: 10% remained on 60 mesh, and 19% passed through 60 but remained on 120 mesh. It contained $4.50 gold, 1.8% copper, 9% iron, and 76% insoluble. The concentrate assayed $17 gold, 2.9% copper, 34% iron, and 18% insoluble; the recoveries were 33% of the gold, 13% of the copper, and 38% of the iron. No doubt, had the pulp been classified and the fine material passed over slime tables or vanners, better results would have been obtained, but the Company does not intend to use mechanical concentrators for the slime, preferring to rely on the flotation process, so it was not worth while experimenting with them.During the flotation experiments with eucalyptus oils some tailing was produced which contained a fair amount of gold, and attempts were made to recover some of this by amalgamating and cyaniding. It was found that no extraction by amalgamation was possible, nor was any extraction by cyaniding possible without either roasting or finer grinding. On unroasted tailing assaying $3 gold and 0.44% copper, after crushing to pass 120 mesh, separating the slime, and leaching the sand for 9 days,
Add Comment