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(1) the treatment of acid mine water before pumping into streams or rivers; (2) the disposal of mine spoil wastes in carefully prepared and designed disposal sites; (3) planned and detailed mapping of the fractures in the Mamu Formation for more effective dewatering scheme and increased exploitation of the
China's proven coal reserves account for approximately 13.2% of the world's proven coal reserves, and coal mining has become the main way for China to obtain energy (Ministry of Natural Resources 2020).With the continuous investment in coal mining safety, the accident rate and the number of deaths caused by coal mining are …
An efficient dewatering scheme helps the management authority of mines in decision-making on the minimum quantity of withdrawal of groundwater from open-cast mines to avoid excessive groundwater withdrawal from the mines. Karst aquifers are characterized by a dual flow system consisting of Darcy flow and non-Darcy flow in the …
Dewatering is one of the main auxiliary tasks in open cast mining operations. In general that is done by vertical wells. However, the application of horizontal wells for dewatering …
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 …
Numerical simulation approaches have been widely applied to study mining induced subsidence, and they are potential methods to study the flooding induced uplift for abandoned mines. This paper gives an overview about different numerical approaches to simulate uplift induced by flooding abandoned underground mines, including three …
Dewatering, Fig. 1. Categories of dewatering methods for excavations. ( a) Groundwater control by pumping (Groundwater is pumped from lines or arrays of wells or sumps located in or around the excavation to lower groundwater level below the base of the excavation.) ( b) Groundwater control by exclusion (Low permeability cut-off walls are …
300 Flooded Underground Mines: Case Studies. habil:SpringerHabilWolke 06.11.2007 15:43 Seite 300. 270 m below ground level with electrical conductivities of about 3 mS cm -1. in the upper portion ...
It is, therefore, necessary to dewater the rock mass before commencing mining excavations. A proposed mine dewatering scheme to facilitate rock mass dewatering surrounding the mining excavations and a description of the slope stability analysis of the high wall using the software "SLIDE" version 5 is outlined.
This study investigates multiple types of water resources in the western mining area in China, their supply-demand balance by using the same dimension gray …
The most popu1,ar method of mine water control in underground mining is dewatering by pumps. The optimum design of mine pumping systems should be aimed to achieve effective mine dewatering together with high operational efficiency, low maintenance and overall costs. The pumping systems should be designed to deal with seasonal inflow fluc-
This study investigates multiple types of water resources in the western mining area in China, their supply-demand balance by using the same dimension gray recurrence dynamic model GM (1, 1), and ...
Therefore, the CH 4 desorption characteristics during dewatering in deep and shallow coal samples were compared. As shown in figure 6, during dewatering, the peak value and peak area of the two peaks in deep and shallow coals decrease with the decrease of water pressure. The width of the first peak is larger and the starting point of …
1 Introduction. Roadway instability has always been a major concern in deep underground coal mines where the surrounding rock strata and coal seams are weak and the in situ stresses are high. Rock falls from roof and ribs are one of the major causes of mine personnel injuries, equipment damage and production losses.
Hydrogeological studies of the Enugu coal mining area were carried out which included hydrogeochemical analyses of water samples. These analyses revealed high sulphate and iron content in the acid mine drainage water as well as high total dissolved solids' (TDS) and low pH (acidity) values. The water issues from the Ajali Sandstone formation and the …
Coal mining by PT. Tambang Bukit Tambi uses an open pit mining system where one of the factors that can affect mining is water that entering the mining area, so water control must be...
The higher the VS, the more difficult the dewatering. The dryness achieved will be low, the mechanical properties will be low and the flocculant consumption will be high. When the VS of the sludge is high, it is recommended to add a thickening stepin the process in order to achieve a better dewatering. 1.3.3. The colloidal nature of the sludge:
Groundwater increase the cost of mining operations, and dewatering can produce negative environmental impacts. In such conditions it is necessary to establish the best technologies of mining drainage, from surface and/or underground, supporting any decision with the analysis of the best available ... Such was the problems on the Berga coal mine ...
According to the annual census of coal preparation plants conducted by Coal Age [], the USA operates 286 coal preparation plants in 12 states.This number is relatively small by comparison to the worldwide fleet which is estimated to be 2,283 plants [].The capacity of the plants can range from less than 200 t/h for small operations to 6,000 t/h or more for …
Groundwater inflow to an underground mine will seriously affect its mining plan and engineering geology safety. Groundwater models are powerful tools commonly used in the mines to develop dewatering strategies. Many mines in the Kolwezi area have been present since the 1950s, and groundwater flow patterns have been significantly …
Land subsidence is a typical geological disaster that will produce many secondary disasters and negatively impact human production and life. Human engineering activities (underground mining and coal mining) are the leading causes of land subsidence. This study takes Jining, a typical land subsidence city in eastern China, as a …
Unstable walls and permeating water, however, can reduce productivity unless the dewatering solution is for water wells to be used, or directed drilling, to act as drainage. Peripheral water wells increase a mine wall's stability by controlling water seepage. This dewatering method eliminates or limits water in some mine galleries, and ...
Options available to mine management are dewatering, diversion, sealing or a combination of methods. To achieve the most effective, least cost method it is essential that the origin of the ground ...
Another reason dewatering is important in the mining industry is to reduce hauling costs. A final product is normally free of water or the water is significantly removed to allow for easier and cheaper …
PDF | In the pumping system of mines are very important factor which is considered. The purpose of a dewatering system for …
2 Geohydrology. in a reduction in the pore pressures in the pit slopes. In passive. dewatering, a sump is often excavated at the pit bottom, and. the groundwater is allowed to enter the sump ...
A fluid–solid coupled numerical simulation was carried out for the Zhaolou coal mine using Flac3D software. The results showed that: (1) when the failure depth of the floor exceeded the extension depth of the floor rock mass and the hydrostatic seepage pressure of the fractured structure surface exceeded the stress state of the fractured …
The main objectives of this study is the selection of the most optimal geotextile material (in terms of price/quality ratio) and technological scheme of dewatering of water-coal slurry …
Therefore, to explore the safety and feasibility of deep coal seam floor mining in north China coalfield, this paper takes the coal seam mining in Pingdingshan coal mine as the engineering ...
