scholarly journals Safety, health and hazards related to using of sprayed concrete in underground mining works

2020 ◽  
Vol 305 ◽  
pp. 00067
Author(s):  
Mihaela Toderaş ◽  
Ciprian Danciu
Keyword(s):  
Material Science ◽  
Underground Mining ◽  
Innovative Technology ◽  
Application Area ◽  
Sprayed Concrete ◽  
Adequate Ventilation ◽  
Multiple Hazards ◽  
Chemical Admixtures ◽  
Mining Works ◽  
Concrete Operation

Sprayed concrete is a traditional building material, but at the same time it represents a highly innovative technology. The development of sprayed concrete includes material science and advances spraying equipment technology. The performance and characteristics of sprayed concrete depend mainly on the condition of its application, equipments, experience and competence of the crew performing the sprayed concrete operation. This paper presents some aspects regarding a sprayed concrete operation that may have multiple hazards due to the equipment, pressure value and the projection of rebound. In addition, the use of sprayed concrete in underground mining works, involve an adequate ventilation in the application area. Special attention has to be given to chemical admixtures and complementary products use in the constituent materials and finally, in the composition of sprayed concrete.

Update of the Ventilation Network Related to Livezeni Mine

Mining Revue ◽  
2021 ◽  
Vol 27 (2) ◽  
pp. 1-5
Author(s):  
Eva Biro ◽  
Sorin Mihai Radu ◽  
Doru Cioclea ◽  
Ion Gherghe
Keyword(s):  
Underground Mining ◽  
Ventilation Network ◽  
International Level ◽  
Mineral Substances ◽  
Air Flows ◽  
Mining Works ◽  
Mining Work ◽  
Over Time ◽  
Ventilation Networks

Abstract The ventilation networks are associated with the set of underground mining works used for the extraction of useful mineral substances. Over time, the ventilation networks involve a change in the structure due to either the expansion or restriction of the mining works structure. For the establishment of air flows at the level of each active mining work, specialized programs are used at international level. These programs allow the modelling and solving of complex ventilation networks. The most advanced specialized programs are those from the VENTSIM range. The paper presents the updating of the ventilation network related to Livezeni mine, with the help of the VENTSIM program.

scholarly journals Influence of structural and textural features of ores and rocks on mine dust explosion hazard during development of pyrite deposits

2020 ◽  
Vol 192 ◽  
pp. 03017
Author(s):  
Marina Rylnikova ◽  
Viktor Fedotenko ◽  
Natalia Mitishova
Keyword(s):  
Sulfur Content ◽  
Underground Mining ◽  
Environmental Safety ◽  
Ore Deposits ◽  
Dust Explosion ◽  
Explosion Hazard ◽  
Mining Operations ◽  
Mine Dust ◽  
Mining Works ◽  
Explosive Properties

In the practice of mining works, sulfide-dust explosions often occur during underground development of pyrite ore deposits: copper-zinc, lead-zinc, copper-nickel, antimony, and others. This makes it necessary to conduct researches aimed at improvement of methods for studying the explosive properties of sulfide dust and development of industrial and environmental safety requirements for mining operations. Currently, there is no generally accepted state-approved regulatory procedure for assessment of sulfide dust explosion hazards during underground mining operations in Russia. Assessment of the type and concentration of mine sulfide dust in the underground mine atmosphere is vitally important for solving this problem. In practice, ores even with a sulfur content of less than 35% can constitute a sulfide dust explosion hazard, although mine dust with a sulfur content of less than 35% does not explode in laboratory conditions. To identify the cause of this phenomenon and develop technical solutions for ensuring safety of underground mining operations, change in the sulfur content of various mine dust fractions obtained from primary disintegration of sulfides was studied.

scholarly journals Experimentation of a new type of permissible explosive under the specific conditions of the Jiu Valley mines

2021 ◽  
Vol 342 ◽  
pp. 02003
Author(s):  
Robert Laszlo ◽  
Emilian Ghicioi ◽  
Cristian Radeanu ◽  
Bogdan Garaliu Busoi ◽  
Stefan Ilici
Keyword(s):  
Underground Mining ◽  
Coal Dust ◽  
Coal Mines ◽  
Emulsion Explosives ◽  
Methane Gas ◽  
Geological Characteristics ◽  
New Type ◽  
Coal Rock ◽  
Safety Recommendations ◽  
Mining Works

At the underground mining works performed in coal, rock and mixed coal & rocks, the process applied almost exclusively is by drilling & blasting. Given that the mines in the Jiu Valley are classified as methane mines, this involves the use of explosives and means of initiation that are safe from methane gas and coal dust. To date, permissible powdered explosives have been widely used. The drilling & blasting patterns were established according to the physical - mechanical and geological characteristics of the rocks in the massif, the type and section of the mining works as well as the restrictions imposed by the methane regime of the mines. In recent years, the widespread use of emulsion explosives has led to the development of permissible types of emulsion explosives. In order to use the permissible emulsion in the coal mines in the Jiu Valley, it was necessary to test in the INSEMEX landfill the safety and functioning parameters as well as to perform underground blasts, in the specific conditions of the methane coal mines. The paper describes the underground experimental blasting works performed, as well as technical and safety recommendations for the use of this type of explosive - permissible emulsion.

scholarly journals Sublevel stoping with applying artificial hardening stowing pillars for extraction of veins in complicated geotechnical conditions

2021 ◽  
Vol 6 (4) ◽  
pp. 252-258
Author(s):  
Sh. I. Khakimov ◽  
Sh. R. Urinov
Keyword(s):  
Rock Pressure ◽  
Underground Mining ◽  
Pressure Control ◽  
Underground Mines ◽  
Advantages And Disadvantages ◽  
Combined Use ◽  
Mining Machinery ◽  
Mining Methods ◽  
Mining Works ◽  
Sublevel Stoping

In the process of underground mining of deep levels rock pressure can appear in any form, creating a serious threat to the lives of miners, disrupting the normal course of mining works and reducing the efficiency of mining production. The solution of the problem of rock pressure control becomes very urgent for underground mines developing vein deposits at a depth of more than 250 m. The aim of the study is the development and justification of mining methods to provide safe and efficient mining of deposits in complicated mining and mechanical conditions. In this paper, the factors of redistribution and dangerous concentration of stresses in the mined ore mass were identified, the methods of rock mass management in complicated geotechnical conditions were studied, and their advantages and disadvantages were revealed. It was determined that the sublevel stoping with the combined use of existing methods of rock pressure control and applying selfpropelled mining machinery is currently one of the most promising method finding widening application scope. In the context of Zarmitan gold ore zone the options of technological schemes of the sublevel stoping method were considered, providing for a combination of different methods of rock pressure control, allowing to minimize the disadvantages of one method through using the advantages of other ones. We proposed sublevel stoping options with artificial polygonal pillars and with artificial columnar pillars, which allowed to reduce ore losses in inter-stope pillars, arch pillars, and secondary dilution. In addition, artificial pillars, taking compressive/tensile stresses, prevent their concentration and create safe conditions for extraction at adjacent and underlying levels.

Deformation Characteristics of a Technological Pillar in the Chamber-Pillar Mining System/Charakterystyka Deformacyjna Filara Technologicznego W Komorowo-Filarowym Systemie Eksploatacji

2014 ◽  
Vol 59 (2) ◽  
pp. 323-335
Author(s):  
Wiesław Grzebyk ◽  
Lech Stolecki
Keyword(s):  
Underground Mining ◽  
Measurement Techniques ◽  
Measurement Data ◽  
Deformation Characteristics ◽  
Mining System ◽  
The Face ◽  
Pillar Mining ◽  
In Situ Observations ◽  
Mining Works

Abstract The article presents the suitability of the new measurement techniques for monitoring deformations of the technological pillars and fragments of the face in underground mining. The conducted observations concerned the mined pillar located in the lead of mining field G-3/4 of Rudna mine (mine belongs to KGHM Polska Miedź S.A.) in a situation of constant progress of mining works in its direction. The observations conducted underground provided results demonstrating the suitability of the applied observation techniques in this area. The obtained measurement data directly describe the volumetric changes which form the basis for assessing the stress of the rock formation. This issue is well recognised based on the tests on rock samples. Further studies should concern the transfer of these experiences to the results of in situ observations.

scholarly journals Spatial Representation of Useful Minerals Deposits

Mining Revue ◽  
2021 ◽  
Vol 27 (2) ◽  
pp. 84-92
Author(s):  
Mihai Valentin Herbei ◽  
Roxana Claudia Herbei ◽  
Larisa Ofelia Filip
Keyword(s):  
Underground Mining ◽  
Mining Industry ◽  
Earth’S Crust ◽  
Mineral Deposits ◽  
Mineral Matter ◽  
Qualitative And Quantitative ◽  
Technological Complexity ◽  
Quantitative Performance ◽  
Mining Works ◽  
Earth's Crust

Abstract Starting from the fact that in the mining industry and in general in the field of underground constructions, the topographic activity, regardless of which of its manifestations, conditions and substantiates the achievement of economic and technological objectives, implicitly resulting in the dependence between topographic precision and qualitative and quantitative performance of mining. The level at which the professional responsibility of the topographic activity, as a whole is engaged in the achievement of some proposed objectives, depends on the framework resulting from the technological complexity of the mining activity in the conditions of its restructuring and efficiency. Spatial representations of useful mineral deposits in the earth's crust, which meet the quality conditions necessary for the design of underground mining works, can be used to choose the most efficient methods of opening, preparation and exploitation of useful mineral deposits. These analyzes are the basis for the realization of underground topographic networks that have a precise connection with the topographic base at the surface. The use of stereographic projection and stereographic networks can be achieved by faithfully representing the tectonics and positioning of deposits of useful mineral matter inside the earth's crust.

scholarly journals Procedure for the prevention of musculoskeletal disorders: application in underground mining works

Duazary ◽  
2020 ◽  
Vol 17 (3) ◽  
pp. 54-69
Author(s):  
Yordán Rodríguez-Ruíz ◽  
Elizabeth Pérez-Mergarejo ◽  
Walter Alejandro Barrantes-Pastor
Keyword(s):  
Risk Assessment ◽  
Musculoskeletal Disorders ◽  
Working Conditions ◽  
Underground Mining ◽  
Hazard Identification ◽  
Work Related ◽  
Work Related Musculoskeletal Disorders ◽  
Mining Works ◽  
Mining Work

The incidence and prevalence of work-related musculoskeletal disorders is currently one of the most important challenges facing the mining sector. This paper proposes a procedure to prevent these diseases, based on the active participation of workers. The procedure was structured in four stages: hazard identification, risk assessment, proposal of improvements, and implementation and follow-up. To support the application of the procedure, a set of ergonomic methods and tools appropriate for mining work were proposed. The main results of the application of the procedure in an underground mine in Peru are shown, demonstrating its practical value, as well as its usefulness in the improvement of working conditions and in the creation of a preventive culture. The proposed procedure is expected to serve as a reference in the prevention of musculoskeletal disorders in mining works.

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