Estimation of mining width for a platinum mine

2020 ◽  
pp. 149-154
Author(s):  
B. Shi ◽  
L.M. Bloom ◽  
U.A. Mueller
Keyword(s):  
Mining Width

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.

Analysis on Ground Subsidence in Underground Mining

2011 ◽  
Vol 383-390 ◽  
pp. 2201-2205
Author(s):  
Xin Xi Liu ◽  
Xue Zhi Wang
Keyword(s):  
Underground Mining ◽  
Ground Deformation ◽  
Coal Pillar ◽  
Mining Area ◽  
Ground Subsidence ◽  
Recovery Coefficient ◽  
Mining Width ◽  
Movement And Deformation ◽  
Relationship Of ◽  
The Relationship

Analysis on the characters of ground subsidence of Yangjiaping mining area, with same excavation depth and recovery coefficient, the numerical simulations to nonlinear large deformation using finite-difference method(FLAC) are achieved on the different strip extraction schemes that adopted different mining and reservation width. The result indicates that the subsidence values and horizontal deformation increases with the increasing of the strip extraction width on condition of the same recovery rate. Based on probability density function (PDF) method, the relationship of the coal pillar width, the mining width and ground deformation is acquired, which is some useful reference for using the strip extraction method to control the surface movement and deformation.

scholarly journals Fractal evolution of a crack network in overburden rock rtratum

2000 ◽  
Vol 5 (1) ◽  
pp. 47-52 ◽  
Author(s):  
Guangming Yu ◽  
Heping Xie ◽  
Jianfeng Zhoa ◽  
Lun Yang
Keyword(s):  
Spatial Distribution ◽  
Fractal Dimension ◽  
Fundamental Problem ◽  
Quantitative Description ◽  
Surface Subsidence ◽  
Physical Models ◽  
Overburden Rock ◽  
Crack Network ◽  
Rock Stratum ◽  
Mining Width

A quantitative description for the spatial distribution and the evolution of a crack network in mining rock stratum is one of the most difficult and fundamental problem in the subject of surface subsidence. In this paper, the physical models are employed to simulate the spatial distribution of a crack network. By using the fractal geometry, the self-similarity of spatial distribution of crack network is discovered. As a result, the conception of fractal crack network is proposed. Furthermore, the evolution of a crack network with the increasing of mining width is investigated. It is shown that (1) the spatial distribution of a crack network displays the fractal behavior, so, the fractal dimension can be used to describe quantitatively the evolution of the crack network, (2) the fractal dimension of the crack network increases with increasing of mining width, (3) the surface subsidence increases with the increasing of fractal dimension of crack network.

scholarly journals Substantiating rational schedule to load trucks using draglines while mining a pit of Motronivskyi MPP

2021 ◽  
pp. 23-28
Author(s):  
B.Yu Sobko ◽  
O.V Lozhnikov ◽  
M.O Chebanov ◽  
V.A Kardash
Keyword(s):  
Feasibility Analysis ◽  
Dump Truck ◽  
Development Cost ◽  
Graphical Modeling ◽  
Development System ◽  
Truck Loading ◽  
Rational Procedure ◽  
Mining Width ◽  
Concentration Degree ◽  
Selection Of

Purpose. To substantiate a rational schedule for the combined dragline-truck operation taking into consideration a coefficient of mining in the context of the pit. Methodology. Mathematical and graphical modeling was involved while determining a coefficient of mining concentration in the pit as well as feasibility analysis to select a rational procedure scheme for dragline operation. Findings. Recommendations for the selection of rational dragline operation, while truck loading in the context of Motronivsko-Annivskyi pit, have been developed taking into consideration mining concentration degree in the pit. It has been determined that bottom dragline unloading into a truck, located in the central part of bench mining width, as well as the dragline position at 0.5 A distance from the bench crest, is the most efficient plan of action for the conditions. Technological scheme to develop Motronivsko-Annivskyi pit has been proposed. Originality. Dependence of the mining concentration in the pit upon the parameters of development system elements according to different technological schemes has been derived. The dependence helps estimate development cost for overburden rocks using draglines with direct unloading into trucks. Practical value. Technological schemes for the combined dragline dump truck operation have been developed. Their use makes it possible to cut the prime cost of overburden activities. Implementation of the proposed solutions helps cut stripping cost by UAH 79.65 million a year if annual overburden volume is Qrozkryvu - Qstripping = 13.5 million m3/year.

Analysis of Influence Characteristics on Slope Stability of Underground Mining in Slope Outer Zone

2012 ◽  
Vol 524-527 ◽  
pp. 255-260 ◽  
Author(s):  
Shi Guo Sun ◽  
Hong Yang ◽  
Zhan Bin Zhang ◽  
Tian Wen Zhang ◽  
Chun Sheng Wang
Keyword(s):  
Slope Stability ◽  
Space Dimension ◽  
Underground Mining ◽  
Outer Region ◽  
Outer Zone ◽  
Stability Coefficient ◽  
Mining Depth ◽  
Geometric Size ◽  
Mining Width ◽  
Mining Slope

Under the action of surface-underground unite mining, Slope stability is related to underground mining location and mining space dimension, This paper studies the underground mining of slope outer region on slope stability influence characteristic; With the increase of mining width stability coefficient increases, when mining width reach a certain value stability coefficient tends to constant; With the increase of mining depth stability coefficient increases, when mining depth reaching a certain value stability coefficient began to decrease; this show that the underground mining has a direct effect on slope stability, its size needs a combination of their relative spatial position relation and mining geometric size to determine.

Numerical Analysis of the Recovery Rate Influence with Stowing Roadway Mining in Daizhuang Shengjian Coal Mine

2012 ◽  
Vol 577 ◽  
pp. 177-182 ◽  
Author(s):  
Chun Sheng Li ◽  
Jian Hao Yu ◽  
Yong Ye An ◽  
An Qi Li
Keyword(s):  
Coal Mine ◽  
Recovery Rate ◽  
Coal Pillar ◽  
Horizontal Stress ◽  
Calculation Model ◽  
Recovery Ratio ◽  
Coal Recovery ◽  
Coal Wall ◽  
Mining Width ◽  
The Impact

Daizhuang Shengjian Coal Mine has dense village above the ground. Through analyzing the process of stowing roadway mining, the author establishes a numerical calculation model about the influence of recovery rate on the mining with stowing roadway. Under the condition of fixed mining width, simulating the impact of different coal pillar width on horizontal stress of coal wall, vertical stress of coal pillar and roadway roof, at the end, according to the result of the simulation, the ratio of extraction to reservation and coal recovery ratio can be determined

The shift step optimization of belt conveyor in self-advancing semi-continuous mining technology based on SIMIO

2017 ◽  
Vol 14 (4) ◽  
pp. 324-328
Author(s):  
Xinwang Li ◽  
Li Li ◽  
Huayong Lv ◽  
Tianqiang Guan
Keyword(s):  
Computer Simulation ◽  
Open Pit ◽  
Computer Simulation Model ◽  
Belt Conveyor ◽  
Modeling Framework ◽  
Mining Technology ◽  
Content Type ◽  
Continuous Mining ◽  
Mining Width ◽  
Operational Modes

Purpose This paper aims to develop a computer simulation processing method to simulate the mining operation of self-advancing semi-continuous mining technology and optimize the shift step of belt conveyor by using simulation modeling framework based on intelligent objects (SIMIO). The method would effectively solve the challenge of field testing such large-scale equipment. Design/methodology/approach The four operational modes of self-advancing semi-continuous mining technology at single bench had been illustrated. The operational system of this technology was analyzed and broken down to single units. By analyzing the time constitution of one operation cycle, the theoretical optimization model of shift step can be established and the optimization criteria is the time utilization ratio being maximum. Once the simulation flow was determined, a three-dimensional (3D) computer simulation model of this mining technology was developed by adapting the SIMIO simulating software to the theoretical model. The models were run to investigate the outputs from different operational modes using geological and mining data from East open-pit mine. Findings The result of these simulations showed that the four-mining-width one-shift (FMWOS) is at maximum production capacity during all operation modes. If transfer equipment is necessary, then this mode can adapt, but system will become more complex. There are minor differences between two-mining-width one-shift and three-mining-width one-shift. If transfer equipment is not necessary, then the two-mining-width one-shift can adapt during actual production. Originality/value The simulation results show that the proposed method can achieve the optimal shift step of a belt conveyor and effectively reduce the time loss caused by the coordination of multiple pieces of equipment while simultaneously improving operational efficiency.

Analysis of Separation and Dislocation Characteristics of Layered Roof in the Mined-Out Areas

2012 ◽  
Vol 256-259 ◽  
pp. 75-80
Author(s):  
Shu Ren Wang ◽  
Zhong Qiu Wang
Keyword(s):  
Coal Seam ◽  
Lateral Pressure ◽  
Slow Growth ◽  
Gradual Increase ◽  
Shape Variation ◽  
Maximum Value ◽  
Mining Width ◽  
Dip Angle ◽  
Maximum Separation ◽  
Flat Arch

The computational model based on the shallow mined-out areas was built by using FLAC3D, and the separation and dislocation characteristics of the layered roof in the mined-out areas were analyzed under different conditions. The results showed that the maximum value of the layered roof separation increased with the increase of the mining width, and that value decreased with the increase of lateral pressure and the cohesion between layers. The separation curves of the layered roof showed the shape variation from the symmetry flat arch to the asymmetric steeple arch and then to the linear form, the maximum separation value of the layered roof exhibited a three-stage tendency of a gradual increase, a steep reduction and a slight change, and the maximum dislocation value of the layered roof presented a two-stage tendency of firstly slow growth and then rapid growth with the increase of the dip angle of coal seam.

scholarly journals Surface and New Building Deformation Analysis of Deep Well Strip Mining

2020 ◽  
Vol 2020 ◽  
pp. 1-14
Author(s):  
Yuanzhong Luan ◽  
Yue Dong ◽  
Yanhe Ma ◽  
Liyuan Weng
Keyword(s):  
Surface Deformation ◽  
Simulation Method ◽  
Deformation Monitoring ◽  
Deformation Analysis ◽  
Measuring Instruments ◽  
Strip Mining ◽  
Deep Well ◽  
Mining Depth ◽  
Mining Width ◽  
New Buildings

Aiming at the problem of surface movement and long-term stability of a work plane of deep well strip mining in Shandong Province, an observation station is set up on the surface of strip mining, and the surface deformation value during strip mining is measured with advanced measuring instruments; on the stable surface of the old mining area, the surface deformation monitoring work is also carried out for new buildings. In addition, the FLAC3D simulation method is used to determine the subsidence factor of different mining depth, mining width, mining length, and mining thickness, and the mathematical model between the subsidence factor and mining depth, mining width, mining length, and mining thickness is established. After the surface of the old goaf is basically stable after strip mining, the high-rise buildings are built. By changing the size of the new buildings and the amount of the load imposed on the surface, the surface deformation is simulated and calculated, and the relationship between the different load positions, load sizes, loading building sizes, and the surface activated deformation is obtained. The measured value of the surface deformation confirms that the load of the new buildings can induce the activation of the old goaf and make the surface generate secondary deformation, but the activated deformation makes the new building within the range of 1, so the new building is safe.

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