Abstract
Mayskoye gold deposit is located in Chukotka, Russia. Ore bodies are mineralized brecciation zones composed of vein-quartz, argillic altered rocks (siltstone and carbonaceous silts) with fine disseminated and veinlet gold-bearing arsenopyrite and pyrite. Two main technological types of ores were distinguished at the deposit: primary and oxide. The main reserves were represented by primary ores, which are classified as refractory. Oxide ore had a quartz-micaceous composition with minor feldspars, kaolinite and sulfides. Beside native visible and colloidal gold, other main carriers of gold in oxide ore are arsenopyrite, pyrite, minerals of scorodite group and stibnite. Tested oxide ore sample showed low recoveries, according to the existing flow sheet in the CIL plant. Cyanidation tests showed some preg-robbing effect on organic matter. Flotation of carbonatious matter with consecutive leaching of flotation tails proved to have better recoveries than direct leaching by reducing preg-robbing on carbon three times.
Highlights
Mayskoye Au deposit is located in Chaunsky region in Chukotka, Russia
The main reserves were represented by primary ores, which are classified as refractory
Oxide ore had a quartz-micaceous composition with minor feldspars, kaolinite and sulfides
Summary
The ore was formed by quartz-pyrite-arsenopyrite shear opening veins in terrigenous sequence of carbonaceous siltstone and sandy-siltstones. Major part of gold was refractory and concentrated in arsenopyrite and partially pyrite. Primary ores are treated with flotation recovering around 90% of gold with sulfide concentrate, which was shipped to Amursky POX plant for oxidation and cyanide tank leaching. Upper part of the deposit contains oxide ore, which mostly was not refractory and free leaching. The studied oxidized ore sample had low gold recovery in CIL plant, directed to gold deportment analysis and lab test work. Most of the refractory gold was represented by “invisible” gold It was contained both in the native form, and was dispersed in liberated ore minerals: pyrite, arsenopyrite, stibnite and scorodite, and their binaries with gangue. Such study in plant products was necessary to chase the issue and find optimization in reagent scheme or the flow-sheet
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