rss_2.0Mining Revue FeedSciendo RSS Feed for Mining Revue Revue Feed and Achievements Regarding the Increase of the Open Pits’ Economic Efficiency<abstract> <title style='display:none'>Abstract</title> <p>Starting from the remark that in the 20<sup>th</sup> and early 21<sup>st</sup> century open pits have experienced an unprecedented expansion, the paper analyzes the current and future concerns related to the open pits of useful mineral substances and highlights with concrete data and notable achievements all the activities carried out in an open pit, finally presenting the technical-economic indicators obtained in Romanian open pits.</p> </abstract>ARTICLEtrue on the Mobility and Toxicity of Heavy Metals from Balomir Tailings Dump – Uricani Jiu Valley<abstract> <title style='display:none'>Abstract</title> <p>Coal mining is a vital industrial activity but often associated with negative environmental effects, including the accumulation of waste containing heavy metals in tailings dump. These heavy metals, such as lead, chromium, copper, zinc, cadmium, mercury, and others, pose significant risks to the environment and human health. The mobility of these heavy metals is a major concern, as they can be released into soil and water during rain or erosion processes, contaminating water sources and affecting aquatic and terrestrial life. These metals can be taken over by plants and eventually end up in the trophic chain, including in humans. The toxicity of heavy metals is well known, with these substances having harmful effects on human health. In this paper, the main ways of transferring heavy metals into environmental components and their spatial distribution from sterile holes to water and soil environment components. As a case study, the sterile Balomir hole, an inactive hole for about 9 years resulting from the exploitation of the hule from the Uricani mine located in the Jiu Valley.</p> </abstract>ARTICLEtrue Aspects of the New Economy in Valea Jiului Carboniferous Basin<abstract> <title style='display:none'>Abstract</title> <p>The new economy of Valea Jiului Carboniferous Basin changes the economic profile of the six localities with urban status in Hunedoara County: Petroșani, Vulcan, Lupeni, Petrila, Uricani and Aninoasa. The changes in the new economic landscape occurred in a relatively short period of time (about 33 years) and created educational, social and political imbalances. The new economy proposes the reintegration of a significant part of the population by abandoning extractive operations, reducing the secondary sector of the economy and focusing on the tertiary sector, the service sector. The business environment in the Valea Jiului coalfield is going through a new stage, which began with the restructuring that began in 1990. It is influenced positively or negatively by technological advances, European Union policies, local, national and international political events and the evolution of demand and supply. Technology and strategic innovators have the opportunity to quickly enter competitive markets and replace or assimilate local players.</p> </abstract>ARTICLEtrue of Hydrography Elements Using Image Interpretation and Processing Techniques<abstract> <title style='display:none'>Abstract</title> <p>Determining the geometric elements required for the probabilistic calculation of flood bands for watercourses within a hydrographical basin can be achieved by extracting information from remote sensing digital recordings. Given the increasing frequency of extreme hydrological phenomena, the use of data obtained through aerial remote sensing offers the advantage of rapidly determining the geometric characteristics needed to generate profiles for the probabilistic calculation of flood bands for all watercourses within a hydrographical basin.</p> </abstract>ARTICLEtrue for Synchronizing Equipment Used in Cartographic Data Collection<abstract> <title style='display:none'>Abstract</title> <p>Technologies for collecting cartographic data using mobile platforms equipped with various types of equipment involve the integration and synchronization of the equipment to ensure that the spatial positioning of the collected data is as precise as possible. This article aims to analyse the possibilities for synchronizing data from a mobile terrestrial laser scanning system with images from a classic digital camera integrated into the system.</p> </abstract>ARTICLEtrue the Accuracy of Drone Measurements on Hydrotechnical Works<abstract> <title style='display:none'>Abstract</title> <p>Topographic measurements made with the drone is an alternative way for creating 3D models, point clouds, etc., but they should be considered correct placement of ground control points to complete the required works precisely. To meet these needs to have a sub millimeter precision in this publication we will treat such as positioning, verification and comparison precisions achieved by attaching ground control points to the point cloud. These ground control points are measured with two different devices, namely the robotic total station and two dual-frequency GPS receivers used in base &amp; rover mode. Errors made on ground control points can influence the whole cloud of points and we will demonstrate the extent to which this occurs.</p> </abstract>ARTICLEtrue on the Identification of Inactive Mining Sites with the Potential for Soil Contamination in the Jiu Valley – Case Study Balomir Tailings Dump<abstract> <title style='display:none'>Abstract</title> <p>Jiu Valley is in an extensive transition process from an area rich in coal deposits to an area with 0 Carbon emissions. Coal mining was carried out in 14 mining perimeters arranged along the Jiu Valley. At the same time, the extraction of the useful mineral substance resulted in waste material that was stored in tailings dumps. Out of the total of 49 landfills, 25 have been greened, 15 are inactive and 9 are active. The total area occupied by them is approximately 210 ha, arranged near mining operations, in the valleys of some streams and even in the vicinity of human settlements. The paper aims to identify the potential for soil contamination due to inactive tailings dumps.</p> </abstract>ARTICLEtrue and Evaluation of Coal Mine Ventilation Management<abstract> <title style='display:none'>Abstract</title> <p>The main scientific and practical results of the study and assessment of ventilation control in coal mines using the decomposition method based on data from the analysis of aerodynamic parameters of air distribution are presented. This will lead to increased safety and reduced accident rates in mining operations at coal mines. Methods of decomposition, statistical dynamics, set theory, fundamental laws of mining aerodynamics, and discrete mathematics are described. The studies were carried out based on the experimental data of the authors using various mathematical and statistical methods. A universal technique is proposed that can be used in mine workings for analysis, assessment of ventilation processes and associated aerodynamic factors, as well as optimization of the air distribution control system under various operating modes. A methodology and application software developed on its basis have been compiled. Automated geographic information systems such as GIS K-MINE® (Krivoy Rog, Ukraine) and VENTSIM are recommended. This system has been approved by regulatory authorities in Ukraine and is utilized by specialists from industry institutes, State Mining Supervision authorities, mines, and others. They are adapted for coal mines, ensuring increased safety and efficiency of work. This will ensure increased safety, labor protection, and reduced accident rates in coal mining operations.</p> </abstract>ARTICLEtrue Gold of the Dacians<abstract> <title style='display:none'>Abstract</title> <p>The Dacians hoarded about 200 tons of gold and 400 tons of silver, before the Roman conquest of 105/106 AD. The exploitation of gold and silver by the Dacians is attested by the multitude of artifacts discovered in the territory inhabited by them. The work presents the most important treasures of gold and silver of the Dacians, but also the evaluation of the spoils of war taken by the Romans after the defeat of the Dacians.</p> </abstract>ARTICLEtrue Perspectives in the Educational System at the Level of the Valea Jiului Carboniferous Basin, in the Context of the New Economy<abstract> <title style='display:none'>Abstract</title> <p>The research of the reality in the territory of Valea Jiului Carboniferous Basin focuses both on the peculiarities of social ideas regarding the position of education and learning in the value system of individuals in society, as well as on the psychological principles for strengthening values in socially unstable conditions. The conclusions reached in the process of determining the degree of integration of self-confidence in the value system of the adolescent personality, showed that the development of self-confidence at a high level influences the infusion of values and the formation of one’s own system. Changes in the subject’s attitude and tendency to ensure uniformity and consistency of information, attitude and behaviour can be observed.</p> </abstract>ARTICLEtrue Optimization of Occupational Risk Assessment in Romania: Case Study for the Activities Carried Out Within a Hydrotechnical Construction<abstract> <title style='display:none'>Abstract</title> <p>After 18 years since the legislative changes in the field of safety and health at work introduced the obligation to assess occupational risks at all workplaces, we note that the indigenous method of the National Research and Development Institute for Labor Protection in Bucharest was quasi-generalized in applicability. Starting from this practical reality, this paper aims to offer a more synthetic and pragmatic version of the application of the method for more complex jobs/activities, in which several socio-professional categories of workers are involved, by structural optimization of the procedure for the implementation of the specific stages and tools, in order to increase the effectiveness of the assessment of occupational injury and illness risks. This finality is achieved through a case study applied to a construction activity carried out within an important hydro-technical project. The main advantages of the approach proposed by the authors are summarized.</p> </abstract>ARTICLEtrue of Suddenly Changing Loads by Drive Means of the Driving Mechanism of the Scraper Conveyor<abstract> <title style='display:none'>Abstract</title> <p>An electromechanical method is proposed to avoid peak dynamic loads in a steady state, the condition of smooth start and emergency stop, as well as correction of the scraper conveyor productivity depending on the load flow level of the blasting combine, which will increase the reliability and reduce the energy and metal consumption of the transport link of the mining complex.</p> </abstract>ARTICLEtrue Cleaning of Internal Surfaces of Bunkers Without the Presence of Operating Personnel Inside the Bunker<abstract> <title style='display:none'>Abstract</title> <p>Bunkers are an integral part of the infrastructure of enterprises in various industries processing bulk materials. Corrosion processes and the formation of dust deposits on the internal surfaces of bunkers are irreversible and often lead to disruptions in the technological process and equipment performance parameters, and in some cases, to accidents. The stability and continuity of technological processes for processing bulk materials largely depend on the cleanliness of the internal surfaces of bunkers. Even the best technical characteristics of technological equipment only indicate the technical capabili-ties of the operation of technological lines. Their reliable and effective operation can be ensured by proper maintenance of the condition of internal surfaces and cleaning from corrosion and deposits. Increased dustiness, poor visibility, and confined spaces significantly complicate the conditions for performing work by service personnel inside bunkers. The enclosed space inside bunkers is a very dangerous place not intended for the work of service personnel. In order to avoid endangering ser-vice personnel and prevent people from entering the bunker, methods are proposed to easily, quickly, and, most importantly, safely clean the surfaces inside the bunkers.</p> </abstract>ARTICLEtrue of Gold in Antiquity<abstract> <title style='display:none'>Abstract</title> <p>The work presents a history of the exploitation and processing of alluvial gold in Antiquity by the first civilizations of mankind. But those who developed and perfected this technology were the Romans, in Hispania and Britannia, where they mined gold both outcrops and underground. The technology they used was so advanced that it remained unchanged for more than a millennium.</p> </abstract>ARTICLEtrue to the Analysis of Mining Equipment Fatigue Through the Dirlik Method and Spectral Analysis<abstract> <title style='display:none'>Abstract</title> <p>The paper analyses the phenomenon of mining machinery fatigue, focusing on the Bucket Wheel Stacker-Reclaimer KsS 5600/3800x40 machine. To evaluate fatigue cycles under variable and non-periodic force conditions specific to this type of machine, Dirlik method and spectral analysis are applied. Dirlik method provides an innovative approach to stress spectrum analysis, taking into account the complex distribution of stress amplitudes during coal stacking operations and their deposition on the conveyor belt. Spectral analysis provides detailed insight into the frequency distribution in the dynamic response of Bucket Wheel Stacker-Reclaimer. This analysis allows the identification of the dominant frequencies associated with the charging and discharging cycles. The results obtained have significant implications for the optimisation of operations and the effective management of fatigue within this specific equipment.</p> </abstract>ARTICLEtrue the Risk of Terrorist Attacks Against Technical Infrastructures Intended for the Storage of Explosives For Civil Uses<abstract> <title style='display:none'>Abstract</title> <p>The paper presents the results of the theoretical and practical research on the development of the infrastructure for assessing the risk of terrorist attacks associated with undesirable events such as major accidents that can occur at explosives storehouses. The scientific research was carried out within the framework of Project PN 16 43 02 15 - CORE Program titled “Researches regarding the increase of security degree in the technical infrastructures for storing explosives for civil uses”. The use of the DIRE version 1.0 software package specialized in the field of risk assessment of terrorist attacks on explosives storehouses has provided the necessary premises for an objective and highly accurate assessment of this type of risk in the technical infrastructure and the quantification of the degree of damage to the human component and on-site or neighbouring targets, as well as to the area in their proximity.</p> </abstract>ARTICLEtrue Verification of Calculation Formulas for Hydraulic Characteristics of Ash Suspension Removal<abstract> <title style='display:none'>Abstract</title> <p>The article presents a comprehensive analysis of the hydraulic characteristics of ash suspensions, in particular the removal of ash from the Dnieper Hydroelectric Station. The importance of this research is justified by the relevance of understanding hydrodynamic processes in suspensions, which is crucial for the efficiency of mineral resource processing. The study focuses on the investigation of the physico-chemical properties of suspensions, which is fundamental for the development and optimization of technological processes. The main goal of the article is to determine the discrepancies between theoretical calculations and experimental data in the context of the hydraulic characteristics of ash suspensions. Focusing on this issue, the research aims to make an important contribution to the accuracy of prediction and calculation of the behavior of suspensions, which has important practical applications. The research methodology includes a series of experiments to measure various hydraulic parameters of the suspension, including suspension density, solid phase weight content, and porosity. The experiments are based on a detailed analysis of ash samples collected from the Dnieper Hydroelectric Station. It is established that theoretical formulas for determining hydraulic characteristics are well confirmed experimentally. The difference is due to the accuracy of measuring the density of the solid phase and errors in measuring weight and volume; it is sufficiently small and does not have a fundamental character.</p> </abstract>ARTICLEtrue the Dynamics of Carbon Dioxide Dispersion in Closed Spaces<abstract> <title style='display:none'>Abstract</title> <p>Human society is in full development. Proportionately, the industrial activity continuously develops and diversifies. Various technological processes also bring with them specific risks such as the one generated by the presence of carbon dioxide in closed premises. The effect of this gas on the human body is destructive and can reach situations incompatible with life. Preventive measures presuppose a good knowledge of how this gas disperses. This paper details the experimentation carried out to identify how carbon dioxide disperses.</p> </abstract>ARTICLEtrue Simulation of Methane Ignition in Enclosed Spaces<abstract> <title style='display:none'>Abstract</title> <p>In the research on gas explosions, the emphasis has been and continues to be primarily on physical experiments conducted on various scaled-down models. Building models at actual size is often a resource-intensive task in terms of materials, time, and human resources. The rapid advancement of computational techniques has allowed, among other things, the transfer of gas explosion research into the virtual environment. For validating computerized simulations of this kind, physical experiments and specialized literature are still considered fundamental. However, one of the challenges posed by the virtualization process is the limitation of conducting simulations in fully or partially enclosed spaces, under initially imposed conditions, without the possibility of dynamically modifying these conditions based on the development of overpressures generated by the virtual explosion. This paper details a computerized experiment where the boundary conditions were successfully transformed into predefined pressure threshold surfaces, transitioning from rigid surfaces to surfaces capable of releasing the overpressures developed in fully or partially enclosed spaces. This approach aligns the results of these simulations with the real dynamic effects of gas explosion events.</p> </abstract>ARTICLEtrue Simulation of Carbon Dioxide Dispersion Dynamics in Closed Spaces<abstract> <title style='display:none'>Abstract</title> <p>Carbon dioxide is a suffocating gas resulting either from industrial activities from combustion or explosion. There may also be carbon dioxide deposits under pressure, quartered in porous geological formations. This gas can show slow or violent releases with accumulation at ground level. Carbon dioxide is a gas that is both toxic and asphyxiating. This gas can accumulate in closed spaces and when it exceeds the concentration of 12% vol. it becomes lethal. For the protection of working personnel, it is necessary to identify and apply the most effective preventive measures. This requires an understanding of carbon dioxide’s behaviour during the build-up phase. The research gives a CFD analysis for determining the dynamics of carbon dioxide dispersion in a confined enclosure.</p> </abstract>ARTICLEtrue