The paper presents the analysis of studies of the enrichment of sulfide and oxidized ores in Yakutia deposits. The ore of the deposit is a mixture of primary, mixed and oxidized ores. The main useful component of the studied ore samples is gold with a content of 1.5 to 2.8 g/t, the silver content is low – 5-17 g/t. Ore minerals are represented by sulfides, among which pyrite predominates. The total sulfide content does not exceed 3-5 %. The presence in the ore of free and associated gold with a grain size from fractions of a micron to 1.5 mm. Gold is represented by nuggets in intergrowth with sulfides and also forms independent inclusions. Ores are classified as easily cyanidable. It was found that the content of amalgamable gold is 10-49, the share of cyanidable gold ranges from 66.67-91, the share of refractory gold is 9.0-33.33 %, which in absolute amount equals to 0.24-0.8 g/t. The extraction of gold in gravitation concentrate varies depending on the gold content in the ore and the yield of concentrate and for ores with a gold content of 1.5-2.8 g/t from 40 to 60 %. The direct cyanidation of all studied ore samples established the possibility of extracting gold into solution up to 86.7-92.9 %, the gold content in cyanidation cakes is 0.2-0.3 g/t. Investigations of the gravitation concentrate by the method of intensive cyanidation showed that with an initial gold content of ~ 500 g/t, up to 98.9 % is extracted into the solution. The gold content in intensive cyanide cakes will be 6-15 g/t. A set of studies carried out by the authors of the article at various institutes showed that it is advisable to process ore from the deposit using cyanidation technology with preliminary gravitational extraction of gold.
Prospects for expansion of the initial raw material base were considered. The scheme of processing of mineral raw materials of the main tailing dump of the Dzhida tungsten-molybdenum complex was developed and tested on the laboratory equipment.
The development of the fuel and energy complex of the Irkutsk region has led to the accumulation of a huge amount of ash and slag waste, which can be considered as technogenic raw materials. The development of technology for their effective processing will allow not only to obtain an economic effect, but also to reduce environmental stress in the areas adjacent to thermal power plants. The paper presents the results of the study of physical, chemical and technological characteristics of TPP wastes of the Irkutsk region and possible technologies of their complex processing.
The morphological analysis of gold from the sedimentation pond of the Dzhida tungsten-molybdenum complex was carried out. The presence of gold and its accumulations in the technogenic layer, size, shape and content, as well as the process of its formation were determined. The author proposed a technological scheme of gold extraction.
