<abstract xmlns="http://www.w3.org/1999/xhtml">
The national policies, in agreement with the European ones, in the energy sector, more specifically regarding the elimination of fossil fuels from the energy mix, also mean the elimination by the year 2035 of production capacities based on lignite and its replacement with natural gas or renewable sources. In this context, the lignite open pits in the Oltenia mining basin are to be closed, or at best put into conservation. Regardless of which option is chosen, one of the most important obligations of the mining operator is related to the ecological reconstruction of the mining perimeters. Thus, in the present paper, we have proposed to analyze the technical condition of Jilț North internal waste dump to ensure that the absolutely necessary stability conditions are met, before starting any type of actual ecological reconstruction works. For this purpose, the stability analyzes performed for the designed geometry of the dump at the end of productive activities are presented and a series of recommendations are made: to ensure the physical conditions necessary in the ecological reconstruction stage; regarding the choice of the type of ecological reconstruction; respectively the choice of species to ensure the success of the ecological reconstruction effort.
</abstract>

Analysis of the Stability State of Jilț North Internal Dump in the Perspective of its Ecological Reconstruction

<abstract xmlns="http://www.w3.org/1999/xhtml">
In the field of mining, one of the exploitation methods that is still the most used in rock salt, potassium, and magnesium salt deposits is the method with the room and abandoned pillar. The salt mining method with rooms and pillars represents a unique spatial system for which the establishment of an optimal correlation between the parameters of the room, pillar, and rock massif is required in any given situation. Thus, the dimensioning of the most requested element in the system is followed, and depending on its parameters, the other parameters of the system are established. Considering the exploitation method with rooms and pillars, the pillars are certainly the elements that are subjected to the greatest loads. In the situation where the deep exploitation of salt is done with square pillars, the evaluation of the optimal parameters of the elements of the exploitation system requires: establishing the loads that appear in the surrounding salt massif (the natural stress state); the qualitative-quantitative determination of the way of distribution of the secondary stress state in the pillars; evaluating the bearing capacity of the pillars; and establishing their geometric elements. Solving this problem can be achieved by different methods: based on the theory of limit equilibrium, taking into account the effective stress in the pillars; methods of the mechanics of the continuous system based on the analytical models for evaluating the secondary stress and deformation state of pillars and floors; and numerical methods combined with the results and measurements from the laboratory and in situ tests. A methodology based on the pillar–room–salt massif interaction principle was proposed for the analytically achievable stability exploitation system of rock salt by the dry method as the depth increased. Applying this method, the secondary stress-deformation state in the pillar can be established by taking into account the rheological behaviour of the salt, changing the pillar shape, and the extraction technology. The presented algorithm can be extended in the field of exploitation, where the room and pillar exploitation methods are used.
</abstract>

The Interaction Principle in the Assessment of Pillars’ Secondary Stress-Deformation State

<abstract xmlns="http://www.w3.org/1999/xhtml">
The long-term response and stability of underground mining works are crucial for ensuring the safety of workers, preventing costly accidents, and maintaining efficient operations. This is primarily due to the critical role these structures play in various industries, including mining, construction, and transportation. Understanding the long-term response and stability of such structures is an important factor for ensuring their durability and safety. Additionally, advancements in technology and engineering practices have allowed for more accurate assessments and predictions of long-term behaviour, leading to improved design and maintenance strategies. By examining the creep and relaxation behaviour, scientists can gain insights into the mechanical properties and stability of rocks under different conditions. The time-dependent experiments involve subjecting the rocks to varying rates of loading or deformation to understand their behaviour under different conditions. These methods provide valuable insights into the time-dependent properties of rocks, allowing researchers to better understand their response to various geological processes and engineering applications. This study was carried out in order to determine the rheological characteristics of the rock salt from Slanic Prahova mine, horizon XIV, and to analyse the local stability and the general stability of the resistance structures. The results of the experimentally determined rheological characteristics showed that the analysed salt has a pronounced tendency to creep, being able to be classified in creep category 5, which is a pronounced creep. The values obtained for the dilatancy threshold confirm the fact that salt is a material system that exhibits dilatancy.
</abstract>

Rheological Characteristics of the Rock Salt from Slanic Prahova, Horizon XIV Below Level of 200m

<abstract xmlns="http://www.w3.org/1999/xhtml">
Industrial recovery is a very important issue and a useful way to replace the degraded land, industrial objectives and to reuse the abandoned sites. It’s important to use a model of including the abandoned industrial territories in the local economic circuit and to integrate these constructions and landforms in the urban network.
This paper wants to highlight the economic potential of aquatic ecosystems developed on degraded lands, using a rapid method of impact assessment and to show that nature has the ability to recover in a new shape useful for human society.
</abstract>

Urban Recovery Potential of the Aquatic Ecosystems Developed on the Degraded Land by Mining Activities in the West Part of Petrosani Depression

<abstract xmlns="http://www.w3.org/1999/xhtml">
The paper presents the direct and indirect mechanism of action of different types of microorganisms in the process of chemical-bacterial solubilization of sulfuric minerals. The discovery of some bacteria that favor the dissolution of metals, increasing the speed of the process up to 500,000 times, proved to be able to improve the parameters of hydrometallurgy and create new possibilities for its application in the recovery of useful elements from different minerals and waste. The mechanism of the chemical-bacterial mineral solubilization process does not proceed according to a unitary mechanism, but corresponds to different mechanisms depending on the nature of the metal, the nature of the ore, the microorganisms and the physical-mechanical conditions in which the bacterial culture acts.
</abstract>

The Study of the Biotechnology of Sulfur Minerals

<abstract xmlns="http://www.w3.org/1999/xhtml">
Indicators of: pH, temperature, conductivity, filtered residue at 105°C, suspended matter, ammonium, chemical oxygen consumption-CCOCr, chlorides, biochemical oxygen consumption - CBO5, sulfates, extractable substances with organic solvents, petroleum products, total iron, calcium, magnesium, sulfides and hydrogen sulfide. The excesses recorded in the sulfate and ammonium indicators in the phreatic waters within the unit premises and in the area of the slag and ash deposits are mainly due to natural causes and to a small extent to anthropogenic action. In accordance with the specialized literature, but also with the studies and research carried out, it is found that the exceedances recorded in the Oltenia area of the specified indicators are due to:- for ammonium (NH4+) - the primary conditions in the Pliocene basin for the formation of aquifer sand deposits; - for sulfates (SO42-) - washing by underground waters of lignite layers in which sulfides frequently appear, especially in the form of pyrite.
</abstract>

Research on Water Quality Indicators at the Rovinari Power Plant

<abstract xmlns="http://www.w3.org/1999/xhtml">
The geodetic points that form the national geodetic network cover large areas, and the accuracy of their determination is a function of the distances between them. In mining areas, a local geodetic network superior in precision to the national geodetic network is required. However, it is necessary to include the geodetic points that form the local network in the national geodetic network. The present work represents the methodology for solving the mentioned purpose.
</abstract>

Inclusion of the Local Geodetic Network in the National Geodetic Network

<abstract xmlns="http://www.w3.org/1999/xhtml">
Noticing the increase in attention given by legislation and national practice to the assessment of occupational health and safety risks of a chemical nature, the article summarizes and explains the results of the research carried out from this perspective in a waste water treatment/purification station. By resorting to a well-established method, especially on the European level, the risks for the safety and health of workers (from the perspective of inhalation and skin risks), fire-explosion risks and environmental risks were evaluated. Based on the results obtained, a preliminary, but extremely necessary and useful, diagnosis of the magnitude of these specific risks was made and - on this basis - prevention/protection measures were proposed which, once implemented, can lead to the minimization of the risk levels associated with the identified hazards specific to the three analysed vectors. Beyond the concrete results of an applied nature, the growth of which the synthesis is systematized can serve as a good practice guide for numerous practitioners in the field of safety and health at work in Romania, in order to increase the efficiency of chemical risk assessments and - implicitly - the effectiveness of mitigation measures for this risk so widespread in industrial activities, processes and operations.
</abstract>

Assessment of Chemical Health Risks, Fire - Explosion Risks and Environmental Impact at Cluj Wastewater Treatment Station within Someș S.A. Water Company

<abstract xmlns="http://www.w3.org/1999/xhtml">
Corrosion is accountable for numerous malfunctions and leakages in gas pipelines. In instances of external corrosion, due to the internal pressure within the pipes, stress concentrations can occur around the corroded areas. These, in the presence of cavities or cracks resulting from corrosion, may amplify the risk of pipeline failure. Consequently, as the wall thickness diminishes due to corrosion, the pipeline’s ability to withstand internal pressure declines. In the case of corrosion, the pressure at which a corroded pipe might collapse is significantly lower than that of an uncorroded one. Finite element modeling of corroded pipes with a defect is conducted using the Abaqus software, taking into account the mechanical effects of internal pressure on the gas pipeline structure. Abaqus facilitates the simulation of internal pressure and predicts the behavior of the pipe under pressure conditions.
</abstract>

Behavior of Corroded Aboveground Pipes Subjected to Internal Pressure

AHEAD OF PRINT

Volume 30 (2024): Issue 1 (March 2024)

Volume 29 (2023): Issue 4 (December 2023)

Volume 29 (2023): Issue 3 (September 2023)

Volume 29 (2023): Issue 2 (June 2023)

Volume 29 (2023): Issue 1 (March 2023)

Volume 28 (2022): Issue 4 (December 2022)

Volume 28 (2022): Issue 3 (September 2022)

Volume 28 (2022): Issue 2 (June 2022)

Volume 28 (2022): Issue 1 (March 2022)

Volume 27 (2021): Issue 4 (December 2021)

Volume 27 (2021): Issue 3 (September 2021)

Volume 27 (2021): Issue 2 (June 2021)

Volume 27 (2021): Issue 1 (March 2021)

Mining Revue

 Revista Minelor/Mining Revue (MinRv), ISSN-L 1220-2053/ISSN 2247-8590, is an official journal of the University of Petrosani, Romania, published quarterly both printed and online.  It is an international open-access, peer-reviewed journal focusing on the development and exchange of scientific and technical aspects (novelties) in the broad field of mining sciences.  We welcome contributions (research papers, reports and reviews) presenting original theoretical, experimental studies and computer simulation and modelling, including but not limited to, the following topics:   Underground/Open Pit Mining (mining technologies, stability of underground mining workings, blasting, ventilation, tunnelling);  Mining mechanization, mining transport, deep hole drilling;  Rock mechanics and geotechnical engineering;  Geology and mine surveying;  Hydrogeology (hydrogeology of surface and underground mining, mine water, dewatering and rebound);  Environmental impact assessment;  Mine waste management;  Raw materials extraction, utilization and processing;  Mine closure and site reclamation;  Occupational health and safety;  Mine planning and design;  Mining process control and optimization;  Reliability, maintenance and overall performance of mining systems;  Risk assessment and management in mining and mineral engineering.   The editors will consider papers on other topics related to mining and environmental issues.  All published research articles in this journal have undergone rigorous peer review, based on initial editor screening and review by independent experts.  The journal is intended for academic scientists, industry and applied researchers, and policy and decision makers.  All necessary information about publishing in Revista minelor – Mining Revue can be found on our website. In addition, the available archive of the journal from 2021 in open access as well as the previous volumes (older than 2021) can also be found on the website of the UNIVERSITY OF PETROȘANI, at www.upet.ro/revistaminelor/eng.php   Archiving  Sciendo archives the contents of this journal in Portico - digital long-term preservation service of scholarly books, journals and collections.  Plagiarism Policy  The editorial board is participating in a growing community of Similarity Check System's users in order to ensure that the content published is original and trustworthy. Similarity Check is a medium that allows for comprehensive manuscripts screening, aimed to eliminate plagiarism and provide a high standard and quality peer-review process. 