Managing the Horizon-Oriented in-Situ Leaching for the Uranium Deposits of Mongolia

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Using the well-known laws of the theory of elasticity and the basic principles of the quasi-static wave hypothesis of the mechanism of destruction of a solid medium by an explosion, methods have been developed for calculating the parameters of drilling and blasting (D&B) for raises advance using the methods of blast-hole and borehole charges. It has been established that the calculating D&B parameters is carried out in the same sequence as when drifting operation. To check the calculating D&B parameters using the new method during raise advance, a numerical simulation of changes in the stress-strain state of a rock mass under the influence of an explosion was carried out. According to the results of numerical simulation, the formation of zones of inelastic deformation in the face of a rising mine working under blast load, uniform grinding of the rock was obtained, which will avoid the release of oversized pieces after the explosion. The developed methodology was tested in the conditions of the “Yuvileina” mine of PJSC “Sukha Balka” during the raise advance of a 1420 m level using a sticked emulsion explosive (EE) Anemix P. Test explosions obtained good results in blasting the face of a raise, uniform crushing of the rock and a high coefficient of use of bore-holes has been established.

Section: Research Resultsmentioning

confidence: 99%

Raises advance using emulsion explosives

Kononenko,

Khomenko,

Kosenko

et al. 2024

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“…In addition to engineering controls, administrative measures such as job rotation, exposure time limitation, and provision of quiet areas for rest breaks can contribute to reducing workers' overall noise exposure [10,15]. Personal protective equipment (PPE) like earplugs and earmuffs plays a vital role in shielding workers from excessive noise exposure [10,16]. However, PPE should be considered a last resort after implementing engineering and administrative controls [15,17].…”

Section: Introductionmentioning

confidence: 99%

Determining the impact of noise exposure of mining enterprises’ workers

Petrenko,

Rieznik,

Shevchenko

et al. 2024

This study investigated one of the main harmful factors at work, namely the impact of noise exposure on employees. The study was conducted in several stages. At the first stage, an on-site measurement was carried out using a calibrated sound level meter and a special smartphone application in the immediate vicinity of the ore grinding mill. It was found that the noise level is not constant. At the second stage, a mathematical dependence of the noise measurement results on the mill operating time was obtained to compare the measurement accuracy of the sound level meter and the app. As a result, it was determined that the application has sufficient accuracy compared to the calibrated instrument. The third stage resulted in the calculation of the risk of hearing loss for employees from noise exposure at workplaces based on the measurements of the calibrated sound level meter. The calculations showed that the level of this risk is high. At the fourth stage, personal protective equipment was selected using the relevant guidelines from NIOSH and EU-OSHA, as well as considering the results of field measurements, the maximum permissible noise level established by state sanitary standards, and the level of hearing loss risk.

“…For large-scale modeling, the finiteelement method [35] and the Box model [36,37] were widely applied to simulate flow and transport in former mining sites in the Ruhr coal-mining area last decades. Along with this, the finite-difference method [38] was also employed to perform hydrodynamic modeling mass and heat transport in mining sites [39,40]. In the case of hydraulically separated mining sites, an analytical method can be applied [41].…”

Section: Introductionmentioning

confidence: 99%

Numerical modelling of flow and heat transport in closed mines. Case study Walsum drainage province in the Ruhr coal-mining area

Rudakov,

Inkin,

Wohnlich

et al. 2024

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High geothermal potential and multiple mine-water-based geothermal installations in Germany and other countries improve the relevance of detailed studies and modeling of promising sites. In this context, we developed a numerical model of water flow and heat transport in the Walsum mine drainage province in the west of the Ruhr coalmining area using the available data on geology, mining, water levels, pumping, and the temperatures of deep rocks and mine water. The model was validated by varying the parameters of groundwater recharge and hydraulic conductivity to achieve sufficient consistency with measured inflows and pumping rates from the central pumping facility located in the Walsum 2 shaft. The calculated mine water temperature of 30.3 ºC is close to the average of the measured temperature varied within the range of 29 – 33 ºC during the last years of mine maintenance. Using the numerical model, we evaluated the expected thermal capacity of a hypothetical open-loop circulation system and two closed-loop geothermal systems within the study area. The installation and operation of these systems would enable the generation of a thermal capacity from a few dozen kW to 1 MW sufficient for small-size to mid-size heat consumers with insignificant impact on the high thermal energy potential of the Walsum mine drainage province.