In-situ leaching of molybdenum and uranium by percarbonate and chloride-hypochlorite solutions

In-situ leaching of molybdenum and uranium is becoming an increasingly common process. The features of the material composition of ores, leading to a decrease in their filtration properties, were considered. Activation leaching with leaching solutions that have undergone electrophotochemical activation before contact with the ore mass were studied. Activation preparation of leaching solutions promotes the synthesis of clustered water molecules with collectivized protons and hydroxyl ions, as well as active forms of oxygen and hydrogen. Cell leaching of molybdenum from mature tailings of the Shakhtaminsk deposit was studied experimentally. After pre-oxidation with an active carbonate solution, a model borehole leaching was carried out with a chloride-hypochlorite solution. Molybdenum extraction on resin a was 85 % in 30 days. Experiments on the percolation leaching of uranium from the ores of the Uchkuduk and Sugraly deposits confirmed the potential possibility of a significant increase in the extraction of uranium by electrophotoactivated percarbonate solutions relative to aqueous solutions of sodium and ammonium carbonate. When leaching with carbonate solutions without an additional oxidizing agent, the extraction of uranium from the Sugraly deposit ore sample was 52 and 59 % (sodium carbonate and ammonium carbonate). The use of hydrogen peroxide as an oxidizing agent made it possible to achieve 87-88 % extraction into pregnant solutions in 21 days without pre-oxidation. The performed studies confirm the processing capability of extracting uranium and molybdenum by percolation leaching in columns and borehole leaching

Prediction method developement of stress fields and of safety measures at launching of complex-structure shock-dangerous deposits

There the study objects are the stress fields of complex-structure shock-dangerous deposits, the rock massif of Khingan tin-ore deposit. The activity criterion of tectonic break has been developed; the assessment principle of stressed condition has been suggested, the distribution mechanisms of stresses in the structure-heterogeneous rock massif have been brought out, the insights about the mechanical processes in the rock massif of complex geological-tectonic structure has been refined. The geodynamical districting of Khingan deposit has been performed; the geodynamical simulator has been developed, and the prediction charts of stressed condition of shock-dangerous deposit horizons have been worked out; the recommendations about the effective and safe performance of mining have been developed and have been realized. "The Tentative directions for the safe performance of mining at the Khingan deposit, which is susceptible to the mine Shocks" have been worked out and have been put into the operationAvailable from VNTIC / VNTIC - Scientific & Technical Information Centre of RussiaSIGLERURussian Federatio

Assessment of the geomechanical state of the rock mass in the Streltsovsk ore field region according to high-precision deformation measurements

The paper presents a measuring set – a single-component laser strainmeter – for geodynamic monitoring within the Streltsovsk ore field. The results of experimental studies with the participation of a laser strainmeter (deformograph) are presented and the influence of external factors on the state of the massif has been estimated. The influence of distant earthquakes on the state of the mountain massif has been estimated. The features of the deformation field behavior during preparation and implementation of a rock burst have been noted. Characteristics of rock burst precursors in the low-frequency measurement region have been given

The research of remote earthquakes impact on the intensity of geomechanical processes in burst-hazardous rock massif

Brief summary of works on the detection of pendulum waves intensifying geomechanical processes in rock massif, with the application of high-sensitivity laser measurements, is represented in the article. Peculiarities and technical characteristics of laser deformograph applied as part of comprehensive geodynamic monitoring system in the area of “Streltsovskoe” ore field have been taken into consideration. The results of experimental research for the evaluation of remote earthquakes impact on the condition of rock massif of “Streltsovskoe” ore field, registration of remote earthquakes and their forerunners are given

The research of remote earthquakes impact on the intensity of geomechanical processes in burst-hazardous rock massif

Brief summary of works on the detection of pendulum waves intensifying geomechanical processes in rock massif, with the application of high-sensitivity laser measurements, is represented in the article. Peculiarities and technical characteristics of laser deformograph applied as part of comprehensive geodynamic monitoring system in the area of “Streltsovskoe” ore field have been taken into consideration. The results of experimental research for the evaluation of remote earthquakes impact on the condition of rock massif of “Streltsovskoe” ore field, registration of remote earthquakes and their forerunners are given

Structural and geomechanical models of gold deposits in the Amur region (Russia)

A large number of gold deposits are concentrated in the Russian part of the Amur river basin. Gold units are characterized by various formation conditions, and, due to this, by a variety of structural factors, as well as stability of rock masses. Structural features, qualities and properties of ore-bearing rocks determine the specifics of choosing mining systems for the units. Geological and geomechanical data obtained in the course of exploration and exploitation of objects allowed us to identify groups of deposits with similar genetic conditions and form common features of their development through the development of appropriate models. There are five major groups of gold deposits. They are represented by deposits formed in epiplatform conditions of young volcanism, in intrusive-tectonic and intrusive-dome structures of Cretaceous age, in metamorphic domes, as well as in tectonic wedges. The selected groups of deposits are localized in masses with different rock stability. In accordance with these features, we developed structural and geomechanical models of gold deposits in the Amur region. The models are used for correcting the methodology of studying deposits and justifying rational methods of their development

Improvement of technical and methodical means of local control burst- hazard of rock mass

At a number of ore deposits of the Far East and the Kola Peninsula dangerous for mining impacts, measurements of acoustic emission parameters have been carried out and new data have been obtained on the specific features of the manifestation of dangerous forms of rock pressure in various sections of the mine field. A method for measuring the local control device “Prognoz L” has been developed and additional criteria for the impact hazard of an array of rocks from a number of deposits developed by the underground method have been substantiated

The assessment of the impact of natural and anthropogenic factors on the current stressstrain state of rock massif of burst-hazardous ore deposits in the East of Russia

This paper does a case study of endogenous deposits located in the zone of influence of convergent (converging, colliding) boundaries of tectonic plates in the zone of the continent-ocean transition, where there is increased present seismic and geodynamic activity, covers the issues of the ratio of natural and anthropogenic components of the stress-strain state (SSS) in rock massifs. It has been shown that, despite the confinement of the studied deposits to a single rock structure, as well as the proximity of their common neotectonic position, the SSS of the rock massifs containing them varies significantly. Based on a comprehensive analysis of geological and geophysical data with the use of space data about the Earth (GRACE mission data for calculation of stress fields and radar images of the Earth's surface), the kinematics of the process of modern deformation of the upper part of the Earth's crust within the studied area is specified. It is established that the peculiarity of the region is the pronounced contribution of the natural component to the general present SSS of rock massifs of impactthreatening deposits. On a real example, the possibility of a predictive assessment of SSS has been shown, which is important at the stages of designing and conducting underground mining operations in severe mining-geological and burst -hazardous conditions

Assessment and control of geodynamical risks under the conditions of a rock-bump hazardous complex deposit

Research has been carried out to study the peculiarities of rockbump hazards and induced seismic manifestations at the Nikolaevskoe deposit, and their close correlation with the tectonic structure of the rock massif has been established. In order to strengthen control over the rock-bump hazard in the TN-3 high-angle fault, in 2019 the observation network was expanded and continuous seismoacoustic monitoring of the rock mass at the deep levels of Nikolaevskoe deposit was organized. Monitoring data is verified by local geoacoustic method using the portable device “Prognoz L”. The results of the monitoring revealed major acoustically active zone with the main amount of seismic and acoustic events recorded during the last 5 years and occurring dynamic rock pressure manifestations. Nikolaevskoe deposit was the site of execution of the industrial experiment on regional discharge of a potentially rock-bump hazardous section of a shock blasting massif

The assessment of the impact of natural and anthropogenic factors on the current stressstrain state of rock massif of burst-hazardous ore deposits in the East of Russia

This paper does a case study of endogenous deposits located in the zone of influence of convergent (converging, colliding) boundaries of tectonic plates in the zone of the continent-ocean transition, where there is increased present seismic and geodynamic activity, covers the issues of the ratio of natural and anthropogenic components of the stress-strain state (SSS) in rock massifs. It has been shown that, despite the confinement of the studied deposits to a single rock structure, as well as the proximity of their common neotectonic position, the SSS of the rock massifs containing them varies significantly. Based on a comprehensive analysis of geological and geophysical data with the use of space data about the Earth (GRACE mission data for calculation of stress fields and radar images of the Earth's surface), the kinematics of the process of modern deformation of the upper part of the Earth's crust within the studied area is specified. It is established that the peculiarity of the region is the pronounced contribution of the natural component to the general present SSS of rock massifs of impactthreatening deposits. On a real example, the possibility of a predictive assessment of SSS has been shown, which is important at the stages of designing and conducting underground mining operations in severe mining-geological and burst -hazardous conditions