Currently, in the development of the raw materials base of the gold mining industry, there is a tendency to reduce the quality of the initial mineral raw materials due to the depletion of reserves of rich gold-bearing ores. The article discusses the technology of extraction of refractory gold-bearing concentrates based on low-temperature leaching of pyrite concentrate. A decrease in the parameters of the autoclave oxidation of sulfide minerals, such as pyrite and arsenopyrite, leads to the incomplete extraction of gold into the solution and, consequently, its losses during subsequent cyanidation. As a possible option for a more complete extraction of gold using low-temperature oxidation technology, a method of flotation separation of elemental sulfur from leaching cakes is proposed. According to the basic process flow chart, the flotation process designed for gold extraction is carried out after autoclave oxidation, but before cyanidation. A series of experiments were carried out with varying reagent conditions and the dependence of gold losses on the extraction of elemental sulfur in the flotation tailings was established. As determining factors, pH and solid content in the initial pulp were considered. The paper justifies the separation of elemental sulfur from autoclave cake to enriched sulfur concentrate. The cake flotation modes after autoclave oxidative leaching of pyrite concentrate are investigated. The distribution of elemental sulfur and gold by flotation products makes it possible to conduct the tailings cyanidation process with acceptable indicators.
On the basis of the identity of qualitative distribution of curvature and horizontal deformations the boundary horizontal deformation value is found to assess the water conducting fracture zones height through the deformation parameter. Due to the characteristics of the process of strata movement in geological conditions of Yakovlevski rich iron ore deposit, the values of the boundary horizontal deformation and fracture zone height were found.
According to the results of geomechanical monitoring in the excavations of Yakovlevski mine distribution of zone water conducting fractures in consequence of displacement and deformation of rocks from concrete backfilling voids evaluated. The convergence of the boundary curvature and the curvature obtained from observations of strata movement to a single span istaken into consideration.
Due to the ever-increasing housing density and increased demands on outdated municipal communications, which often forces the builders to work on updating and expanding the network of underground facilities in areas where it is imperative to ensure a minimal impact on the earth's surface. The study examined possible methods for reducing time and material resources to carry out observations of the settling of the objects in the construction zone.