scholarly journals Open-Pit Mine Dewatering Based on Water Recirculation—Case Study with Numerical Modelling

Energies ◽  
2021 ◽  
Vol 14 (15) ◽  
pp. 4576
Author(s):  
Kazimierz Różkowski ◽  
Robert Zdechlik ◽  
Wojciech Chudzik
Keyword(s):  
Numerical Modelling ◽  
Drainage System ◽  
Open Pit ◽  
Open Cast Mining ◽  
Classic Approach ◽  
Water Recirculation ◽  
Hydrodynamic Field ◽  
Open Cast ◽  
Selection Of

The layout of the dewatering system in open-cast mining must be adapted to mining assumptions and to the size of expected inflows, which, in turn, depend on natural conditions and the operation of other mines and groundwater intakes, affecting the arrangement of the hydrodynamic field. This case study analyses possible dewatering solutions related to a change in the mining drainage system: decommissioning by flooding of a depleted deposit and dewatering of a new one located in the vicinity. As part of numerical modelling, a solution was sought to minimise the environmental impact of drainage. Forecast calculations for two drainage alternatives were made. One of the solutions follows the classic approach: independent dewatering of the new excavation. The second solution assumes the recirculation of waters from dewatering of the new mine through their discharge into a closed and flooded pit located in the vicinity. The results of the forecasts for both variants point to the modification of the hydrodynamic field resulting from expected volumes of inflows and different environmental effects. The use of numerical simulations assisted the selection of the optimal dewatering solution.

scholarly journals Multi-Criteria Analysis for the Selection of the Optimal Mining Design Solution—A Case Study on Quarry “Tambura”

Energies ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 3200
Author(s):  
Branimir Farkaš ◽  
Ana Hrastov
Keyword(s):  
Decision Making ◽  
Multiple Criteria Decision Making ◽  
Open Pit ◽  
Design Solution ◽  
Mine Design ◽  
Promethee Ii ◽  
Mining Design ◽  
Quarry Mine ◽  
Selection Of

Mining design is usually evaluated with different multiple-criteria decision-making (MCDM) methods when it comes to large open pit or underground ore mines, but it is not used on quarry sites. Since Croatia is mostly mining stone, the implementation of such methods in decision making of the quarry mine design is imperative but left out. In this paper, the PROMETHEE II and AHP decision-making methods are implemented on the quarry site to find out the best final quarry design contour. By implementing the MCDM methods, the best quarry model was chosen based on 22 different criteria parameters out of three final quarry designs. The chosen model is not only financially sound but also has the least environmental impact.

scholarly journals Development of technological schemes for open-pit mining of deposits using “mobile crushing-reloading-conveyor complexes”

2020 ◽  
Vol 201 ◽  
pp. 01010
Author(s):  
Tulkin Annakulov
Keyword(s):  
Technological Scheme ◽  
Open Pit ◽  
Open Pit Mining ◽  
Transport Equipment ◽  
Cyclic Flow ◽  
Open Cast Mining ◽  
Annual Productivity ◽  
Sequential Mining ◽  
Working Out ◽  
Open Cast

This article analyses the use of cyclic-flow technology schemes with mobile crushing and reloading complexes in open cast mining. An analysis of the application of cyclic-flow technology schemes with mobile crushing and reloading complexes in open cast mining shows that the main directions of its radical improvement are the development, creation and implementation of fundamentally new mining transport equipment and technological schemes for its quarries, which include: “mobile excavators crushing and transhipment plants and conveyor systems". Technological schemes for the development of rocks with an end arrangement of mobile complexes using a single bucket excavator and conveyor transport, with an end arrangement of mobile complexes and an increased width of the working platform during conveyor transport, with an end arrangement of mobile complexes and the presence of a mobile interstage loading crane with sequential mining at three horizons, a methodology has been developed for determining the working time and annual productivity of mobile crushing and handling conveyor complexes and a new technological scheme for the development of overburden ledges using mobile crushing and handling conveyor complexes. To reduce the time for idling the complex and reduce the number of exit ledges, a new technological scheme for the development of overburden ledges with the use of mobile complexes is recommended. As a result of the calculations according to the developed method, when working out two benches with different block lengths, the dependence of the annual productivity of the complex on the block length was established.

scholarly journals First experience with Remote Sensing methods and selected sensors in the monitoring of mining areas – a case study of the Belchatow open cast mine

2018 ◽  
Vol 29 ◽  
pp. 00023
Author(s):  
Jaroslaw Wajs
Keyword(s):  
Region Of Interest ◽  
Open Pit ◽  
Mining Areas ◽  
Dumping Site ◽  
Lignite Mine ◽  
Sentinel 2A ◽  
Remote Sensing Methods ◽  
Land Changes ◽  
Open Cast

The paper presents satellite imagery from active SENTINEL-1A and passive SENTINEL-2A/2B sensors for their application in the monitoring of mining areas focused on detecting land changes. Multispectral scenes of SENTINEL-2A/2B have allowed for detecting changes in land-cover near the region of interest (ROI), i.e. the Szczercow dumping site in the Belchatow open cast lignite mine, central Poland, Europe. Scenes from SENTINEL-1A/1B satellite have also been used in the research. Processing of the SLC signal enabled creating a return intensity map in VV polarization. The obtained SAR scene was reclassified and shows a strong return signal from the dumping site and the open pit. This fact may be used in detection and monitoring of changes occurring within the analysed engineering objects.

scholarly journals Proper Selection of Blasting Charges Location in Quarries and Open Cast Mines

2006 ◽  
Vol 2 (1) ◽  
pp. 11
Author(s):  
Mostafa Ahmed Ismail
Keyword(s):  
Soft Rock ◽  
Soft Materials ◽  
Contact Layer ◽  
Physical Models ◽  
Correct Position ◽  
Soft Layer ◽  
Open Cast Mining ◽  
Strong Rock ◽  
Open Cast ◽  
Selection Of

The aim of the present study is to assess the effect of the-zone of weakness on blasting efficiency and to determine the correct position of the explosive charge in relation to the suggested soft layers intercalated inclusions of soft materials avoid the escaping of blasting product (heat, pressure) in the contact layer between soft rock and hard rock (ore). Physical models having dimensions (25x25x33cm) were made of cement and sand (1:3) to represent the strong rock deposits which are intercalated by inclusions or layer of soft material which represented by a mixture of cement and clay. The artificial rock models were tested with 5 gm, 10 gm, 15 gm, 20 gm, of gelatine dynamite with detonator No. 6.The charge of 10 gm was more suitable with respect to the distance of throw which is more important for open cast mining with respect to the dimension of working area on a bench. It has found that, the plane of weakness has less effect when the charge is concentrated on the position after the inclusion of soft layer which gave pressure on soft layer and close the possibility of escaping products.

scholarly journals The impact of equipment productivity and pushback width on the mine planning process

2020 ◽  
Vol 120 (10) ◽  
Author(s):  
A.S. Araya ◽  
M. Nehring ◽  
E.T. Vega ◽  
N.S. Miranda
Keyword(s):  
Planning Process ◽  
Mine Planning ◽  
Open Pit ◽  
Open Pit Mining ◽  
Capital Costs ◽  
Planning Processes ◽  
Equipment Utilization ◽  
The Impact ◽  
Selection Of

SYNOPSIS Conventional mine planning processes result in the selection of pushback widths that maximize equipment productivity. This paper challenges the current notion that pushback width should be set at the distance that assures maximum equipment productivity. A hypothetical case study is presented, which shows that the value of a project may increase beyond that determined by traditional planning practices. It was found that it may be better to deploy more aggressive mining strategies, which are likely to result in greater operational complexity and thus reduced equipment productivity. A higher equipment productivity, which often corresponds to wider (and therefore a lower number of) pushbacks, will also often result in later ore extraction and require higher capital costs. Keywords: open pit mining, pushback width, mine planning, schemes of exploitation, mining rate, equipment utilization.

scholarly journals Using the method of electrical imaging for obtaining the modulus of elasticity in open cast mining

2020 ◽  
Vol 192 ◽  
pp. 01030
Author(s):  
Pavel Zuev ◽  
Andrey Vedernikov ◽  
Danila Grigoriev
Keyword(s):  
Physical Properties ◽  
Elastic Waves ◽  
A Priori ◽  
Field Measurements ◽  
Open Pit ◽  
Chrysotile Asbestos ◽  
Calculation Methods ◽  
Open Cast Mining ◽  
Electrical Imaging ◽  
Open Cast

The article presents a description of the methodology for obtaining data on the physical properties of rocks that compose the sides of the open pit for technological optimization of drilling and blasting operations. The methodology is based on field measurements and calculation methods for determining the hardness of rocks at a chrysotile asbestos deposit, which is being mined by an open pit. The physical properties are obtained by comparing a priori geological data with the values of electrical resistivity and the velocities of elastic waves in the rocks. Based on these data, the values of the Young’s modulus are calculated, which characterizes the strength of the rocks composing the array.

scholarly journals Open pit mine wastewater filtration in the overburden rock debris: case study

2021 ◽  
Vol 303 ◽  
pp. 01033
Author(s):  
Eugene Makridin ◽  
Sergey Markov ◽  
Elena Murko ◽  
Ivana Ondrejmiskova
Keyword(s):  
Open Pit ◽  
Overburden Rock ◽  
Mining Enterprise ◽  
Design Documentation ◽  
Mine Wastewater ◽  
Wastewater Filtration ◽  
Treatment Facilities ◽  
Mining Regions ◽  
Selection Of

Discharge of untreated quarry water into natural water reservoirs is unacceptable for environmental reasons. This circumstance is especially relevant for coal mining regions with a high density of mining enterprises. Treatment of quarry waste water at mining enterprises is a necessary process, provided for in the design documentation. It is due to the significant pollution of quarry water by suspended solids, dissolved salts and organic substances. In addition to expensive sorbents (e.g. zeolite), overburden rocks, confined to the mined area of coal deposit, are used for construction of filtering dams. They are used to construct treatment facilities designed for the entire lifetime of the mining enterprise. Thus, their permeability and purification capacity should be maintained for decades. The movement of filtered water in such massifs is subject to the known laws of filtration. Filtering dams should provide both a free movement of water and the required level of its purification. This is achieved by selecting the appropriate geometry of filter dams (their sizes, base slopes) and the choice of overburden capable of providing the required level of purification in a long and qualitative term. The article presents the results of studies of the geometry of the filtering massif and the methodology of selection of overburden used for the construction of filtering dams.

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