scholarly journals Theoretical Analysis of Damaged Width & Instability Mechanism of Rib Pillar in Open-Pit Highwall Mining

2019 ◽  
Vol 2019 ◽  
pp. 1-15 ◽  
Author(s):  
Rui Wang ◽  
Shuai Yan ◽  
Jianbiao Bai ◽  
Zhiguo Chang ◽  
Tianhao Zhao
Keyword(s):  
Failure Criterion ◽  
Failure Process ◽  
Economic Benefits ◽  
Open Pit ◽  
Instability Mechanism ◽  
Coal Seams ◽  
Mining Operations ◽  
Factors Affecting ◽  
Highwall Mining ◽  
Residual Coal

To improve the resources’ recovery ratio and the economic benefits of open-pit mines, the development of highwall mining is used to exploit residual coal. The design of rib pillar, formed by excavation and mining activities in intact coal seams, is crucial to the overall stability and safety of the highwall mining operations. This paper focuses on the damage caused to rib pillars by the large deformation, occurring with the application of highwall mining in an open-pit in China. A mechanical model was established to investigate the damaged width of colinear rib pillars based on Hoek–Brown and Mohr–Coulomb failure criterion. The equations for calculating the damaged width of the rib pillar were obtained, respectively, by combining the Hoek–Brown failure criterion with the Mohr–Coulomb failure criterion. The failure mechanism for the width of the rib pillar and the factors affecting the colinear rib pillar were analyzed in detail. The results show that the application of the Hoek–Brown criterion has a unique advantage in analyzing the damaged width of the colinear rib pillars, in open-pit highwall mining. The instability mechanism and failure process of the rib pillars are described in combination with the limiting equilibrium method and the ratio of the elastic zone’s width to the width of the entire rib pillar.

Rational Research of Deep Concave Open-Pit Slope Angle of Lower Part

2014 ◽  
Vol 716-717 ◽  
pp. 248-251
Author(s):  
Xiao Long Ma ◽  
Guang Zhang ◽  
Qing Guo Ren ◽  
Xiu Ling Jiang
Keyword(s):  
Slope Stability ◽  
Research Work ◽  
Slope Angle ◽  
Mineral Resources ◽  
Research Direction ◽  
Economic Benefits ◽  
Open Pit Mine ◽  
Open Pit ◽  
Future Research ◽  
Factors Affecting

With the rapid advance of industrialization,the consumption of mineral resources is increasing.For open pit mine,many of them went into deep mining.The current,widespread adoption of open pit slope angle makes deep concave mining has a huge stripping ratio.So many mines in trouble,on the premise of guarantee the deep sunken open pit slope stability increase slope toe can bring huge economic benefits,and a lot of research work has been done.This paper describes the factors affecting the stability of open-pit mine slope,the slope rock mass stress analysis,to calculate the lower steep slope economic benefits,puts forward reasonable suggestions the future research direction of the slope stability of open-pit mine.

scholarly journals Substantiation of the Technology of Efficient Transition to High Bench Stripping of Thick Coal Seams

2018 ◽  
Vol 41 ◽  
pp. 01044
Author(s):  
Viktor Fedotenko ◽  
Ekaterina Esina
Keyword(s):  
Environmental Impact ◽  
Negative Impact ◽  
Mineral Resources ◽  
Open Pit ◽  
Coal Seams ◽  
Transport Equipment ◽  
Mining Operations ◽  
Coal Deposits ◽  
Maximum Development ◽  
High Bench

One of the most promising areas of increasing the open mining efficiency with the methods reducing the negative impact on the environment is the use of high overburden benches, including those on the basis of the stripping system with overburden transport. The use of high overburden benches in the open mining of steep and steeply dipping deposits ensures the growth of the completeness the deposit's reserves mining while simultaneously increasing the safety and efficiency of open mining operations and reducing the surrounding environmental impact. The justification of the parameters and the technology of an effective transition to the high bench stripping of thick coal deposits is performed. It is proved, that the transition to high overburden benches in the period of maximum development of mining operations provides the increase in the volume of additional recoverable mineral resources by 18-23% corresponding to the increase in the depth of the open pit mine and the period of its operation. At the same time, the length of transport routes and communications is reduced to 15%, as well as the number of transport equipment and the time for the transfer of machinery and equipment.

Landslide stabilization experience in Urtui open pit mine

2021 ◽  
pp. 102-106
Author(s):  
O. A. Isyanov ◽  
◽  
D. I. Ilderov ◽  
V. I. Suprun ◽  
S. A. Radchenko ◽  
...  
Keyword(s):  
Rock Mass ◽  
Large Scale ◽  
Geological Structure ◽  
Stability Control ◽  
Open Pit Mine ◽  
Open Pit ◽  
Open Pit Mining ◽  
Coal Seams ◽  
Mining Operations ◽  
Early Access

Instability of pit wall slopes is the most critical accident in open pit mining. The risk of damages to pit walls is proportional to the height of exposed surfaces and to the time of exposure. Among many factors governing pit wall stability, the major factor is geological structure and weakening zones in rock mass. Deformation processes are initiated in host rock mass of coal seams mostly because of undercutting of weak interlayers. Alongside with local undercutting, another cause of landslides is transition of coal mining from down-dip extraction to up-dip extraction. The sequence of mining and morphology of weak interlayers also have influence on initiation and evolution of deformations. The basic component of engineering solutions on pit wall stability control is optimization of mining sequence and methods of accessing working horizons in open pit mines. Large-scale deformation of Western and Southeastern pit walls in Urtui mine could be avoided using the optimized sequence of mining operations. For example, mining advance mostly along the curve of the Urtui centroclinal fold, with early access and destress of the eastern and, first of all, western wings of the fold could make it possible to evade from up-dip mining of coal seams and, as a consequence, to solve the major geomechanical problems in the open pit mine.

scholarly journals Analysis of Environmental Costs’ Effect in Green Mining Strategy Using a System Dynamics Approach: A Case Study

2021 ◽  
Vol 2021 ◽  
pp. 1-18
Author(s):  
Amir Jafarpour ◽  
Siamak Khatami
Keyword(s):  
System Dynamics ◽  
Large Scale ◽  
Mining Operation ◽  
Open Pit ◽  
Open Pit Mining ◽  
Processing Plant ◽  
Environmental Costs ◽  
Mining Operations ◽  
Factors Affecting

Nowadays, one of the most significant problems in mining activities is the significance of analyzing environmental issues along with mining, concentration, and mineral processing operations to achieve the goals of sustainable development. Nevertheless, mine owners refuse to include environmental costs (EC) and consider them unprofitable. Due to the ever-increasing importance of environmental and social topics in recent years, there is a vital need for assessing the EC and its impact on total mining costs and implementing green strategies by the mining managers and engineers. The current study tries to model the mining cost structure by considering the causal relationships between different factors affecting open-pit mining costs to highlight the EC’s role. Furthermore, this research evaluates the effectiveness of implementing each possible mining green strategy in a large-scale copper mine using the System Dynamics (SD) approach. In this regard, seven scenarios and a combination of different environmental strategies, including mine reclamation, an environmental strategy for a condensation and processing plant, and environmental mining operations, have been considered for the SD-based economic analysis. The simultaneous use of the green mining strategies for the concentration and processing plant (Scenario 4) shows a high impact on cost reduction in the mining operation.

scholarly journals Reasonable coal pillar design and remote control mining technology for highwall residual coal resources

2019 ◽  
Vol 6 (4) ◽  
pp. 181817 ◽  
Author(s):  
Fangtian Wang ◽  
Cun Zhang
Keyword(s):  
Remote Control ◽  
Coal Pillar ◽  
Open Pit Mine ◽  
Open Pit ◽  
Recovery Ratio ◽  
Coal Resources ◽  
The Road ◽  
Highwall Mining ◽  
Geological Conditions ◽  
Residual Coal

Highwall mining (HWM) technology is an efficient method for exploiting residual coal resources in Chinese open-pit coal mines. However, on-site personnel and equipment can be damaged by the instability of the highwall mining residual coal pillars and subsidence of final end-walls. This paper considers the geological conditions of an open-pit mine in Shendong Coal Field (China) in order to prevent overlying rock fall accidents; the Mark-Bieniawski formula and the FLAC3D numerical simulation are used to analyse reasonable coal pillar widths outside and under the road, which were determined to be 1.7 m and 1.3 m, respectively. Using the EBH132 cantilever excavator for remote control mining, the field experiment shows that the recovery ratio of highwall residual coal resources was over 67%; hence, safety, efficiency and high recovery ratio of highwall mining were achieved for the residual coal resources of an open-pit mine.

scholarly journals Passive Experiments for Monitoring Mining Operations by Dragline at Kuzbass Open Pits – Estimation of Coal Losses

2020 ◽  
Vol 174 ◽  
pp. 01030
Author(s):  
Alexei Selyukov ◽  
Kirill Byrdin
Keyword(s):  
Kuznetsk Basin ◽  
Open Pit ◽  
Open Pit Mining ◽  
Coal Seams ◽  
Mining Operations ◽  
Sedimentary Deposits ◽  
Coal Deposits ◽  
Geological Conditions ◽  
Tectonic Disturbances ◽  
Dip Angle

The natural conditions for the formation of coal deposits in different regions of the globe are the same, all of them belong to reservoir sedimentary deposits and differ only in the degree of metamorphism and tectonic disturbances. In this regard, coal deposits of the Kuznetsk basin (Kuzbass, Western Siberia, Russia)) that have no analogues in nature are unique. Here are all sorts of options for the occurrence of coal seams both in terms of their thickness, dip angle, number, and the degree of disturbance by plicative and disjunctive disturbances. The article presents some results of research on ways to reduce coal losses in open pit mining during its extraction by draglines. The study was carried out on the example of deposits in Kemerovo region with coal seams in an inclined and steep formations, which allows analyzing the possibilities of applying the proposed technological solutions in the widest range of specific mining and geological conditions.

RESEARCH OF THE EFFICIENCY OF USING «GEOVIA SURPAC» AND «MINESCHED» WHEN PLANNING MINING WORKS IN IRON QUARRY

2021 ◽  
pp. 7-15
Author(s):  
Borys Sobko ◽  
◽  
Oleksiі Lozhnikov ◽  
Vladislav Tretyakov ◽  
◽  
...  
Keyword(s):  
Production Control ◽  
Economic Benefits ◽  
Mine Planning ◽  
Production Costs ◽  
Open Pit ◽  
Practical Significance ◽  
Mining Equipment ◽  
Mining Operations ◽  
Mining System ◽  
Ore Minerals

Purpose. Investigate and compare monthly mine planning method using Geovia Surpac and MineSched software. Methods. The computerized research method was used to create a scenario of mining operations in Geovia software for planning monthly operations in the open pit of LLC Eristovsky MPP. Results. It was confirmed that the new software make possible to plan the extraction of ore minerals for a certain period, with the possibility of uniform supply of the concentration plant with ore minerals of the required quality. Also, it became possible to analyze in detail the extraction of minerals from the contours of the open pit and clear production control in the working contours. Scientific novelty. The dependences of the given productivity of mining equipment on the parameters of the mining system elements were established using the MineSched software. The effectiveness of determining the quality of mining minerals is established, when planning for a longer period of time using computer programs in comparison with the old method. The economic benefits of using new software with broader functionality are determined. Practical significance. A new method of planning the ore mass extraction is proposed, which made it possible to supply minerals from the pit with average quality indicators. This contributed to a more efficient product enrichment, which in turn reduced production costs. Also by the new software it was possible to reduce the time for planning mining operations, which led to a decrease in working time to complete the task and, accordingly, reduced the cost of computing operations. Keywords: pit, geological block model, monthly mining plan, Surpac software, Minesched software, batch plan.

scholarly journals Theoretical Features of Rope Shovels and Hydraulic Backhoes Using at Open Pit Mines

2018 ◽  
Vol 41 ◽  
pp. 01003 ◽  
Author(s):  
Andrew Strelnikov ◽  
Sergey Markov ◽  
Ludger Rattmann ◽  
Dieter Weber
Keyword(s):  
Western Siberia ◽  
Open Pit ◽  
Open Pit Mining ◽  
Joint Work ◽  
Coal Seams ◽  
Mining Operations ◽  
Open Pit Mines ◽  
Advantages And Disadvantages ◽  
Technical Solutions ◽  
Open Coal

Open coal mining companies in Kuzbass (Western Siberia, Russia) constantly face challenges to increase the economic efficiency of mining operations, reduce coal losses and increase profitability. One of the ways to increase the efficiency of open pit mining is to improve the technology for the development of coal-bearing zones of quarry fields on complex structured inclined and steep deposits. At present, the projects for promising deposits have been completed, and a number of operating open pits conduct the development of coal-bearing zones along their entire width by horizontal layers. The excavating and loading equipment for overburden and mining operations in these zones is diverse: quarry rope shovels, hydraulic backhoes or their joint work. When they work together in the coal-bearing zone, the rope shovels extracts the interbeds, and the hydraulic backhoes extract the coal seams. However, such technical solutions are not sufficiently substantiated. The fact is that rope shovels and hydraulic backhoes have their advantages and disadvantages in operating.

Management and engineering solutions to improve processing stock quality and reduce resource-intensity of mining

2018 ◽  
pp. 56-68
Author(s):  
V. V. Agafonov ◽  
V. Yu. Zalyadinov ◽  
M. E. Yusupov ◽  
N. S. Bikteeva
Keyword(s):  
Development Strategy ◽  
Open Pit ◽  
Mining Operations ◽  
High Concern ◽  
General Production ◽  
Resource Intensity ◽  
Product Output ◽  
And Control ◽  
A Company

Sustainability of mining companies is of of high concern. The problem is specifically acute at companies that are monotownor monosettlement-forming. Sustainability of a mine depends in many ways on product quality and production resource-intensity. This article discusses formation of mineral quality indexes in terms of an open pit chrysotile mine. The studies took into account specific features of operation procedures implemented by each structural division of the mine. The analysis has found managerial and technological inconsistencies which affect quality and marketable product output, as well as efficiency of the mine in whole. The background for efficiency enhancement at a company is, by the authors’ opinion, consolidation of personnel subject to the single development strategy, namely: improvement of production and control efficiency, as well as use of available reserves and resources by means of better setup for production. The proposed approaches to planning mining operations and forming mineral quality allow higher quality of processing stock. In addition, a new model proposed for interaction between structural divisions of a mining company ensures improvement of general production indexes.

Current state and perspectives in automation of the open pit mining operations

2019 ◽  
Vol 8 (30) ◽  
pp. 115-123
Author(s):  
A.A. Sobolev ◽  
◽  
G.V. Sekisov ◽  
A.Yu. Cheban ◽  
N.M. Litvinova ◽  
...  
Keyword(s):  
Open Pit ◽  
Open Pit Mining ◽  
Mining Operations ◽  
Current State
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