Show Consumption of Cyanide According to the figures furnished in our recent staff correspondence from Mercur Utah the consumption of cyanide cya-nide at the Mercur mill Is 11 pounds to the ton of Ore onehalf a pound at the Sacramento mill and four ounces to the ton at the Sunshine mill says Mining Reporter of Denver The Mer cur mill operates on ore running from 5 to 5C per ton thfc Sunshine ores not averaging over 2 per ton The gangue materials of those ores comprise quartz lime and clay principally The ores from Home sections of the Mercur group are highly Impregnated with arsenic ar-senic making It necessary to resort to roasting before cyaniding The arsenic in these ores is in the form of realgar and orplment and Is pretty thoroughly eliminated by the roasting But the higher consumption of cyanide at this mill than at the other two named is partially due to the small quantity of arsenic remaining after the roast The presence of cinnabar in the ores Is no detriment to cyanide work but on the contrary Is a benefit as by means of it a better precipitation Is effected |