scholarly journals A new automated, safe, environmentally sustainable, and high extraction soft-rock underground mining method

2021 ◽  
Vol 121 (2) ◽  
Author(s):  
A.J.S. Spearing ◽  
J. Zhang ◽  
L. Ma
Keyword(s):  
Coal Mining ◽  
Longwall Mining ◽  
Underground Mining ◽  
Soft Rock ◽  
Ore Deposits ◽  
Mining Method ◽  
Environmentally Sustainable ◽  
Continuous Miner ◽  
Percentage Extraction ◽  
Environmentally Sound

SYNOPSIS Ore deposits are becoming more complex to mine as a result of the exhaustion of surface and other easily mined deposits. There is also increasing socio-political pressure to design more environmentally sound, sustainable, and safe mining practices. Wang and Ma designed a mining method for coal, similar to a modified drift and fill using a continuous miner to take sequential cuts (rooms) that are subsequently backfilled. The authors have modified the concept to make it more autonomous, safer, and less costly using highwall coal mining techniques, modified and adapted for underground applications. The method is more flexible than longwall mining and the percentage extraction would seem to be in the same range. In addition because of the backfilling, surface subsidence would not be a major issue and could be more effectively managed. Keywords: highwall mining, underground coal mining, backfilling, backfill face stability, continuous miner, safety.

scholarly journals An investigation of longwall failure using 3D numerical modelling – A case study at a copper mine

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Phu Minh Vuong Nguyen ◽  
Tomasz Olczak ◽  
Sywester Rajwa
Keyword(s):  
Numerical Modelling ◽  
Failure Modes ◽  
Longwall Mining ◽  
Underground Mining ◽  
Copper Deposit ◽  
Ore Deposits ◽  
Mining Method ◽  
Copper Mine ◽  
3D Numerical Modelling

Abstract It is well-known that the longwall mining method (with roof caving) is widely used in underground mining extraction for bedded deposits (e.g. coal) due to its numerous advantages. Generally, this method is not commonly applied for ore deposits such as copper deposit. In Poland, the longwall mining method has been tested for thin copper deposits at the Polkowice-Sieroszowice copper mine (KGHM). Various failure modes were observed during longwall operation in the 5A/1 panel. This paper aims to examine these occurred failures. To do so, an analysis has been conducted using 3D numerical modelling to investigate the failure mode and mechanism. Based on the 3D numerical modelling results with extensive in situ measurements, causes of failure are determined and practical recommendations for further copper longwall operations are presented.

Mining Project Design under Villages and Comparison Analysis of Mining Method

2013 ◽  
Vol 734-737 ◽  
pp. 768-772
Author(s):  
Gui Liu ◽  
Nai Zhong Xu ◽  
Chao Gao ◽  
Lei Li
Keyword(s):  
Coal Mining ◽  
Comprehensive Analysis ◽  
Project Design ◽  
Strip Mining ◽  
Mining Method ◽  
Comparison Analysis ◽  
Continuous Miner ◽  
Mining Project ◽  
Mining Conditions ◽  
Mining Width

In order to solve the problem of coal mining under villages of regions of Yaoqiao Mine, through comprehensive analysis, the author considers that strip mining has feasibility in realistic, meanwhile, a series of mining width and retaining width was studied for strip mining and eventually a mining project was put forward to meet the unique conditions. By comparing application conditions and range of application between continuous miner used in strip type of Wongawilli coal mining method and shortwall shearer mining method, the author analyzes the economic benefit and draws a conclusion that shortwall shearer mining method has better applicability. Those all provide a new way to mining under villages in Yaoqiao Mine and the conclusion can also be used for reference in similar mining conditions.

Hierarchical fuzzy-AHP-based multi-criteria decision making approach for selection of underground metal mining method

2021 ◽  
Vol 15 (3) ◽  
pp. 405-420
Author(s):  
Bhanu Chander Balusa ◽  
Amit Kumar Gorai
Keyword(s):  
Decision Making ◽  
Underground Mining ◽  
Fuzzy Ahp ◽  
Hanging Wall ◽  
Ore Deposits ◽  
Mining Method ◽  
Metal Mining ◽  
Extrinsic Factors ◽  
Ore Deposit ◽  
Mining Methods

In the last few decades, many underground mining methods were proposed for extractions of ores. The decision-making for selecting the most suitable mining method for a typical ore depost depnds on various intrinsic and extrinsic factors (intrinsic – dip, shape, thickness, depth, grade distribution, RMR (rock mass rating) and RSS (rock substance strength) of ore, hanging wall, footwall, and extrinsic – recovery, dilution, safety, productivity, flexibility, capital). The present study aims to develop a hierarchical Fuzzy-AHP (FAHP) model for choosing the most suitable underground mining method for an ore deposit. The structure of the proposed hierarchical FAHP model consists of five levels. The level-1 of the hierarchy defines two variables (intrinsic factors and extrinsic factors). These are further classified into quantitative or qualitative nature of variable (listed in level-2). The criteria, sub-criteria, and mining method variables are listed respectively in Level 3, Level 4, and Level 5. For each level of the hierarchy, a fuzzy pair-wise comparison matrices are developed using the corresponding levels’ listed variables. These matrices at each level are subsequently used to determine the local and global weights of each variable. The global weights are used for prioritizing the different mining methods. The proposed hierarchical FAHP model was validated by considering the field data of two different ore deposits in India. The results showed that the most appropriate mining method predicted from the decision-making model and the adopted mining method for extracting the ore deposit are same in two case studied mines.

scholarly journals Analysis of combined open-pit and underground mining method for Кuzbass coal deposits

2021 ◽  
Vol 330 ◽  
pp. 01006
Author(s):  
Valeriy Fedorin ◽  
Vyatcheslav Shakhmatov ◽  
Gleb Opruk ◽  
Yelena Kuznetsova
Keyword(s):  
Coal Mining ◽  
Underground Mining ◽  
Mining Industry ◽  
Open Pit ◽  
Mining Method ◽  
Coal Mining Industry ◽  
Advanced Technologies ◽  
Modern Development ◽  
Coal Deposits ◽  
Mining Methods

Modern development of coal mining industry in Kuzbass is carried out using advanced mining techniques. Analysis of its geological and technological conditions is performed with respect to the development of advanced technologies in related coal mining methods, developing combined (open-pit and underground) geotechnologies for complex mining of coal deposits.

scholarly journals Comparative analysis of the mine pressure at non-pillar longwall mining by roof cutting and traditional longwall mining

2019 ◽  
Vol 16 (2) ◽  
pp. 423-438 ◽  
Author(s):  
Peng Zhou ◽  
Yajun Wang ◽  
Guolong Zhu ◽  
Yubing Gao
Keyword(s):  
Pressure Distribution ◽  
Coal Mining ◽  
Longwall Mining ◽  
Mining Industry ◽  
Mine Pressure ◽  
Mining Method ◽  
Working Face ◽  
Distribution Features ◽  
Mining Pressure ◽  
The Stability

Abstract Non-pillar coal mining has been developed and implemented in the recent decades in China's coal mining industry. The non-pillar longwall mining by roof cutting without pre-excavated entry (N00 mining method) is one of the latest non-pillar mining methods and this method has the advantages of reduced roadway drivage ratio and increased resource recovery ratio. Previous studies show that the mining pressure during the working face advancing is one of the main factors that affect the stability of underground structures and the safety production. However, there is no evaluation or analysis of the mining pressure at the mining face using entry retaining with roof pre-cutting and an absence of pre-excavated tail entry. In this paper, both field monitoring and numerical simulation approaches are employed in the analysis of the mining pressure distribution characteristics within a range of the whole working face during the face advancing. The results are compared with the field data and simulation results from the traditional mining method performed in the same coal mine. Results supported the idea that the N00 mining method can generate a low-stress area for the retained entry. The stability of the working face and retained entry can be well maintained due to the mine pressure optimization. This paper can aid in the understanding of structural mechanic modeling and mine pressure distribution features, structural mechanic analysis and mine pressure distribution features of the N00 mining method.

scholarly journals Minimization of Coal Mining Machines Downtime in Coal Mining by Opened-Underground Mining Method on Simulating Model

2020 ◽  
Vol 174 ◽  
pp. 01049
Author(s):  
Igor Kuznetsov ◽  
Vasily Sinoviev ◽  
Aleksey Starodubov
Keyword(s):  
Simulation Model ◽  
Coal Mining ◽  
Stochastic Simulation ◽  
Underground Mining ◽  
Mining Method ◽  
Simulation Experiments ◽  
Deep Mining ◽  
Complex Program ◽  
Stochastic Simulation Model ◽  
Underground Method

Discrete-and-stochastic simulation model has been developed. The model displays in time and space the interaction between elements of excavating machines complex and deep mining seams complex. Program realization of the model has been created in GPSS Studio simulating modeling tool. The influence of offers for minimization of unplanned downtime of mining machines on daily volume of mined coal by opened- and-underground method has been researched in simulation experiments.

Determination of loading capacity index of a continuous miner in soft rock roadway and virtual test method

2022 ◽  
pp. 095440622110616
Author(s):  
Hong Zhang ◽  
You Chen ◽  
Zhihong Zhang ◽  
Honghong Yan
Keyword(s):  
Energy Consumption ◽  
Soft Rock ◽  
Test Method ◽  
Energy Utilization ◽  
Loading Capacity ◽  
Continuous Miner ◽  
Loading Efficiency ◽  
Wheel Loading ◽  
Soft Rock Roadway ◽  
Rock Roadway

To improve the loading efficiency and reduce energy consumption of a continuous miner in soft rock roadway, a seven-arm star wheel designed with Gaussian fitting method was proposed, and a coal loading model of the continuous miner star wheel loading mechanism was reconstructed with EDEM software. The loading capacity of the seven-arm star wheel and the three-arm star wheel of the EML340 continuous miner at different working speeds were studied respectively. The scientific and reasonable identification index was formulated and the index evaluation system of loading star wheel was established. It has been found that the performance of the loading star wheel is a collection of various identification indicators, the coal returning mass reducing the loading efficiency and increasing unnecessary energy consumption, therefore, it is difficult to identify by a single index. Loading coal and rock by the star wheel is a process that consumes energy and pays attention to output, therefore, the identification index should include two kinds of efficiency parameters and energy parameters. Rake coal torque and loading specific energy consumption have reflected the degree of energy utilization, which can be comprehensively used for preliminary design of the star wheel. The performance parameters such as loading power and loading efficiency are reliable indicators for designing and performance evaluation of the star wheel. Based on the statistical analysis of the test data, compared with the three-arm star wheel of the EML340 continuous miner, the loading efficiency of the seven-arm star wheel has been significantly improved. The loading power for coal loading has been reduced by 46%. The feasibility of the Gaussian design method of loading star wheel has been verified.

Experience in the development of innovative underground geotechnologies for mining of ore deposits

2020 ◽  
pp. 338-350
Author(s):  
I. V. Sokolov ◽  
Y. G. Antipin ◽  
N. V. Gobov ◽  
I. V. Nikitin
Keyword(s):  
Systematic Approach ◽  
Underground Mining ◽  
Mineral Resources ◽  
Environmental Safety ◽  
Ore Deposits ◽  
Operating Costs ◽  
Processing Waste ◽  
Ore Preparation ◽  
Additional Value

Based on an analysis of the design principles and practice of underground mining of ore deposits, the most significant features, trends to develop and directions to enhance of underground geotechnology in the field of opening and preparation, mining systems, filling works and ore preparation have been established. The main signs of innovation - scientific research and implementation in production in order to obtain additional value, are highlighted. Various approaches to the development of innovative underground geotechnologies are shown and a methodology for their justification is formulated based on a systematic approach implemented in the framework of the concept of integrated development of mineral resources and on the principles of economic efficiency, industrial and environmental safety, completeness of subsoil development. The experience of the IM UB RAS on the development and implementation of innovative underground geotechnologies in the design and industrial operation of a number of ore deposits is given, which significantly increased the completeness and quality of ore extraction from the subsoil, increased labor productivity in sinking and stoping works, reduced capital and operating costs for ore mining and to utilize mining and processing waste in the mined-out space.

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