scholarly journals Criteria for the difficulty of working out coal-bearing zones of quarry fields

2019 ◽  
Vol 134 ◽  
pp. 01018
Author(s):  
Alexei Selyukov ◽  
Nuray Demirel
Keyword(s):  
Complex Structure ◽  
Uneven Distribution ◽  
Open Pit ◽  
Coal Seams ◽  
Mining Methods ◽  
Coal Reserves ◽  
Working Out

Coal-bearing zones of open pit fields are represented by formations of coal seams from inclined to steep bedding with unstable thickness, both in dip and strike with different dip angles even within the same strata, with varying rock inter-layers and strength. In addition, most coal seams have a complex structure, including rock layers inside. In most cases, there is an uneven distribution of coal seams, and, consequently, coal reserves over the area of quarry fields. In this regard, for the analysis of quarry fields, there is a need to select criteria for assessing the complexity of coal-bearing zones for the purpose of systematizing them and choosing directions for constructing technological schemes for excavation and loading operations and mining methods.

Economic and Technical Analysis of Thick Coal Seam Mining Methods

2012 ◽  
Vol 170-173 ◽  
pp. 872-875
Author(s):  
Xiang Min Zhao ◽  
Peng Yang
Keyword(s):  
Surface Mining ◽  
Economic Security ◽  
Open Pit ◽  
Open Pit Mining ◽  
Coal Seams ◽  
Operating Personnel ◽  
Thick Coal Seam ◽  
Geological Conditions ◽  
Mining Methods ◽  
Seam Mining

Common mining methods for thick coal seams or extremely thick coal seams has slice mining top coal caving mining, greater height mining, and surface mining. From the perspective of economic and technological mining method, the choice of methods should be fully taken into account the technical, economic, quality of operating personnel, equipment, geological conditions. It allows priority to open-pit mining, and then according to the thickness, coal quality, coal other factors to select the top coal caving or mining of high extraction methods which can achieve the economic, security, and efficient purposes. Conversely, if the method is poor choice, it will certainly lead to economic and time losses.

scholarly journals Technological Solutions for Processing Closed Coal Mines by Open Pit Method

2018 ◽  
Vol 41 ◽  
pp. 01041
Author(s):  
Vladimir Makarov ◽  
Péter Kovacs ◽  
Samuel Dagmar ◽  
Riccardo Paulman
Keyword(s):  
Underground Mining ◽  
Underground Mines ◽  
Residual Effects ◽  
Open Pit ◽  
Open Pit Mining ◽  
Mining Operations ◽  
Environmental Consequences ◽  
Harmful Emissions ◽  
Coal Reserves ◽  
Working Out

The main sources of environmental pollution are: pollution from the residual effects of working out of mine fields by underground method; pollution from secondary mining of mine fields by the open method. The pollution of the environment from the underground mining of mine fields is mainly due to the erosion of the surface of the ditches caused by collapse of the underground workings, spontaneous combustion of the remaining coal reserves and exit of poison gases SO2 and CO to the surface through the cracks from the lower horizons of the worked-out mine fields. This makes actual the research of technological possibilities of harmful emissions reducing when quarrying underground mines’ fields. The environment deterioration from conducting open pit mining operations in the underground mine fields is caused by the technological processes of quarrying (preparation of rock for excavation, excavation, transportation of rocks and coal, dumping), by the objects of the open pit infrastructure (industrial site, transport communications, trenches and other workings, coal storage and rock dumps). The main direction of eliminating the negative environmental consequences of underground mining is the localization or complete isolation of the underground mines influence’ on the surface.

scholarly journals On the organization of excavation and transportation equipment in the coal-bearing zones at open pit mines

2021 ◽  
Vol 315 ◽  
pp. 01017
Author(s):  
Maxim Tyulenev ◽  
Sergey Markov ◽  
Oleg Litvin ◽  
Michal Cehlár ◽  
Yaroslav Litvin
Keyword(s):  
Complex Structure ◽  
Open Pit ◽  
Coal Seams ◽  
Open Pit Mines ◽  
Joint Development ◽  
Transportation Equipment ◽  
Development Procedure ◽  
Mining Works ◽  
Dispatching Control

One of the essential issues of the benches’ development procedure is the choice of the method of seam development in the complex structure: joint development of rock and coal seams in one complex face or their separate excavation in blocks of 50-100 m in length. The decision of this question is connected with the mode of mining works, represented by the schedule of stripping and winning works. The choice of one or another method is connected with operative-dispatching control of haul trucks delivery. When rock and coal are mined together in a complex face, overburden haul trucks should be supplied for loading rock and coal haul trucks for coal in turns. It is organizationally difficult to supply haul trucks of different purposes during the shift. It is necessary to proceed from the shift (daily) planning of haul trucks supply for specific faces. In addition, it is necessary to take into account that rock and coal faces are often located on opposite sides of the quarry pit. This article studies the issue of organizing the operation of excavation and loading equipment during the mining of the coal-bearing zone of the open pit in order to reduce the loss of output of haul trucks.

Integrated estimation of strength properties of complex-structure coal seams

2019 ◽  
Vol 8 ◽  
pp. 33-41 ◽  
Author(s):  
Yu.N. Linnik ◽  
◽  
V.Yu Linnik ◽  
A.B. Zhabin ◽  
A.V. Polyakov ◽  
...  
Keyword(s):  
Complex Structure ◽  
Strength Properties ◽  
Coal Seams ◽  
Integrated Estimation

scholarly journals Substantiation of Safe Conditions During Undermining of Hydraulic Waste Disposal

2018 ◽  
Vol 41 ◽  
pp. 01007
Author(s):  
Yuriy Kutepov ◽  
Aleksandr Mironov ◽  
Maksim Sablin ◽  
Elena Borger
Keyword(s):  
Rock Mass ◽  
Waste Disposal ◽  
Coal Mine ◽  
Water Body ◽  
Water Inflow ◽  
Open Pit ◽  
Coal Seams ◽  
Geological Conditions ◽  
Mine Workings ◽  
Mine Dump

This article considers mining and geological conditions of the site “Blagodatny” of the mine named after A.D. Ruban located underneaththe old open pit coal mine and the hydraulic-mine dump. The potentially dangerous zones in the undermined rock mass have been identified based onthe conditions of formation of water inflow into mine workings. Safe depthof coal seams mining has been calculated depending on the type of water body – the hydraulic-mine dump.

scholarly journals Technological Adaptation of Internal Dumping to the Operating Mode of Open Pit when Developing Inclined and Steeply Dipping Coal Seams Strata

2021 ◽  
Vol 315 ◽  
pp. 01015
Author(s):  
Alexei Selyukov
Keyword(s):  
Surface Mining ◽  
Operating Mode ◽  
Open Pit ◽  
Surface Mines ◽  
Technological Adaptation ◽  
Coal Deposits ◽  
Mining Front ◽  
Mining Methods ◽  
Further Development ◽  
Internal Dumping

With surface mining of inclined and steeply dipping coal deposits, the so-called deeping longitudinal mining methods with a gradual deepening of mining from the surface to the final depth are widely spread, while orienting the mining front along the strike line of the seams (strata). When using such mining methods, the volumes of internal dumping are limited or completely absent; there is a peak-like increase in overburden volumes and transportation distance, the land resources disturbing proceeds at a progressive pace. In this regard, it is obvious that an important production task is to find technological solutions and methods to develop coal deposits that reduce the environmental hazard and increase resource conservation in mining by placing overburden in the mined-out space while reducing the area for external dumps and disturbing the earth's surface. If this is not foreseen at the present time, then all coal surface mines in the coming decades will be limited by their own external dumps of overburden, and their further development will be problematic.

scholarly journals Anthropogenic Vegetation in the River Valley Amalat

2019 ◽  
Vol 16 ◽  
pp. 00049
Author(s):  
Marina Tsyrenova ◽  
Evgenia Pyzhikova ◽  
Elena Vasilyeva
Keyword(s):  
Vegetation Cover ◽  
Gold Mining ◽  
Research Study ◽  
Gold Deposits ◽  
Open Pit ◽  
Current State ◽  
Disturbed Areas ◽  
Alluvial Gold ◽  
Anthropogenic Vegetation ◽  
Mining Methods

The article presents the results of a research study of anthropogenic affects of gold mining on forest landscapes in Northern Transbaikalia, Russia and processes of natural reclamation of vegetation cover of the disturbed areas. The study area is located northwest of the Maliy Amalat River, which flows along the Vitim Plateau; in the floodplains of its two tributaries the Aunik River and the Bagdarin River. It is an area where a large number of alluvial gold deposits have been discovered. Some of these deposits are currently being developed, some have already been explored, and some have been abandoned. The authors consider the current state of vegetation cover in a key area of the Amalat River basin, near villages of Malovsky and Bagdarin. The problem of natural resources development and conservation is becoming extremely important for the area under study because open-pit gold mining methods that are used here drastically change the environment and affect water, land and forest resources.

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