scholarly journals CLASSSFICATION OF COAL RESERVES AT THE TYAGLIV AND LYUBELYA FIELDS OF THE SOUTH-WESTERN COAL-BEARING REGION OF THE LVIV-VOLYN BASIN BASED ON THE MAIN NATURAL INDICATORS

2021 ◽  
pp. 53-69
Author(s):  
I.O. Kostyk ◽  
I.V. Buchynska ◽  
A.V. Poberezhsky

A geological-statistic analysis of commercial resources and the predictive coal-bearing potential of the fields of the South-Western coal region, the principal promising part of the Lviv-Volyn Coal Basin, has been carried out. Based on the detailed analysis and systematization of data from prospecting and exploratory-assessment works regarding the depth of occurrence and the thickness of coal seams, ash content, sulphur content and grade composition of coal, resources of the Tyagliv and Lyubelya fields has been re-evaluated. These characteristics have been studied by discrete intervals. Re-evaluation of resources and their classification were carried out for every coal seam, the mine field, the field, and the coal-bearing region on the whole. In total, the analysis was performed for 24 coal seams. By the depth of occurrence of coal seams the majority of coal reserves at the Tyagliv and Lyubelya fields belong to the group of 600-900 m. The majority of predictive resources of coal within the Lyubelya field (6.6%) falls to the group of 900-1200 m. According to the thickness of coal seams, the most of the balance and overbalance reserves at the Tyagliv field is attributed to the groups of 0.61-0.80; 0.81-1.00 m, and at the Lyubelya field to the groups of 0.81-1.00; 1.01-1.20; 1,21-1.50 and over 1.5 m. Within the Lyubelya field, the predictive resources of coal are contained in the group of 0.81-1.00 m. According to the value of ash content, 50 % of balance and overbalance reserves of coal at the Tyagliv field are related to the groups of the medium-ash and ash coal. At the Lyubelya field, the most of coal reserves (66.4%) also corresponds to the group of medium-ash coal, and predictive resources — to the groups of medium-ash (43.1%) and ash (53.1%) coal. According to the content of the mass fraction of sulphur, at the Tyagliv field the balance and overbalance reserves of high-sulphur coal prevail, with the amount of sulphur, low-sulphur and medium-sulphur coal being at the equal ratios. At the Lyubelya field, high-sulphur and low-sulphur coal prevail almost at the equal ratios. Regarding predictive resources, the group of high-sulphur coal prevails within the field. The coal seams within the Tyagliv and Lyubelya fields differ from analogous ones in the industrial part of the basin by the higher thickness and the area of distribution. The depth of occurrence of the seams increases for 15-300 m. Coal in the fields of the South-Western coal region has higher quality and the least ash content. According to brand composition of coal, the technologic groups of gas coal, gas-fat coal and fat coal (according to the Ukrainian classification) prevail at the Tyagliv field. It is proved that gas coal is suitable for coking. At the Lyubelya field, fat, coke-fat and coke coal prevail. Сoke coal comprises almost a half of the reserves. In the region, reserves and resources of coal are estimated to be over two billion tons, which exceeds in two times the residual reserves of the commercial part of the basin. The analysis of the raw material base of the Tyagliv and Lyubelya fields, estimation of reserves and evaluation of coal resources have a great importance for developing and working-out of the feasibility study for their commercial development.

2016 ◽  
Vol 50 (1) ◽  
pp. 13-17
Author(s):  
Shahid Jamil Sameeni ◽  
Zafar Mahmood

  Detailed geological mapping was carried out in Dandli of the Kotli district where Middle Cambrian to Late Miocene rocks are exposed. The coal bearing Patala Formation of the Upper Paleocene epoch is well exposed on both limbs of the doubly plunging Tattapani-Karela anticline and also on the eastern plunge of the doubly plunging Devigarh-Palana anticline. These anticlines are considered as the continuation of the Riasi anticline in Jammu, India. Structurally, the Kotli area lies to the south east of the Hazara-Kashmir Syntaxis. The 73.2 m thick Patala Formation contains two coal seams. The exposed thickness of individual seam ranges from 1 m to 1.2 m and in the underground, it reaches upto 4 m at some places. The coal from the Dandli area has medium volatiles and low moisture with generally low ash content and good fixed carbon. Sulphur content varies from 0.51 to 3.17% and occurs in the form of pyrite nodules. The chemical analyses reveal that the coal is bituminous to semi-anthracite variety.


2021 ◽  
Vol 330 ◽  
pp. 01003
Author(s):  
Ludmila Kuznetsova ◽  
Boris Anfyorov

Coal reserves suitable, in prospect, for underground mining by means of robot-based system of roof coal release are situated in Bachatskey, Yerunakovskey, Kemerovskey, Leninskey, Prokopyevsk-Kiselyevskey and Tom’-Usinskey geological-economic regions of Kuzbass, in the coal seams with the thickness of more than 5 meters and the depth of 600 meters and total about 3 billion tons.


2019 ◽  
Vol 134 ◽  
pp. 01018
Author(s):  
Alexei Selyukov ◽  
Nuray Demirel

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.


2018 ◽  
Vol 41 ◽  
pp. 01002
Author(s):  
Svetlana Kostyuk ◽  
Nikolay Bedarev ◽  
Oleg Lyubimov ◽  
Nikolay Kovalyov

At the present time the problem to search for variants for the development of steep thick coal seams is highly interest. Here there are, for example, variants for managing the workings’ roof by caving or laying the worked out space. The authors proposed a number of methods for it, which are protected by patents. The permissible span of the roof exposure is estimated as a function of the type of the immediate roof of the mine, its thickness, bulk density and tensile strength, and the height of the underlevel is also determined. The technical result is provided by the presence of the protective inter-horizon strips and inter-sectional pillars, by the order of working out the excavation site and by the value of the step of the binding of the worked out space. The above solutions are acceptable for the Prokopyevsk-Kiselevsk coal region in Kuzbass.


2020 ◽  
Vol 2020 ◽  
pp. 1-12
Author(s):  
Anying Yuan ◽  
Hao Hu ◽  
Qiupeng Yuan

At the present time, it is considered to be of major significance to study the gas emission law and stability controls of coal bodies in deeply buried high-gas coal seams. For this reason, in view of the specific problems of gas emissions caused by unstable rib spalling in coal mine walls, comprehensive research methods were adopted in this study, in order to conduct an in-depth examination of micropore structure parameters, gas desorption, diffusion laws, and coal stability levels. The results showed that the development degree of the pores above the micropores, as well as the small pores in soft coal seams, was better than those observed in hard coal seams. In addition, the gas outburst phenomenon was found to have more easily formed in the soft coal seams. The coal body of the No. 6 coal seam in the Xieqiao Coal Mine not only provided the conditions for gas adsorption but also provided dominant channels for gas diffusion and migration. The abnormal gas emissions of the No. 6 coal seam were jointly caused by the relatively developed pores above the small holes in the coal body, rib spalling of coal mine walls, and so on. The research results also revealed the evolution law of mechanical characteristics of the No. 6 coal seam under different water content conditions. It was found that the strength levels of the No. 6 coal seam first increased and then decreased with the increase in water content, and the water content level at the maximum strength of the coal seam was determined to be 7.09%. This study put forward a method which combined the water injection technology of long-term static pressure water injections in deep coal mining holes and real-time dynamic pressure water injections in shallower holes. Field experiments were successfully carried out.


2014 ◽  
Vol 1030-1032 ◽  
pp. 1309-1313
Author(s):  
Ze Hong Cui ◽  
Bin Ren ◽  
Zhao Hui Xia ◽  
Ming Zhang ◽  
Wei Ding ◽  
...  

Based on the analysis of coring, logging and experimental data, fine evaluation on Fort Copper Coal Measures (FCCM) of Early Permian Blackwater Group in north Bowen Basin of Australia has been done. FCCM is a potential coal measure. Eight coal seams exist in FCCM. Laterally, they develop steadily. Seams of FCCM characterize interbedding with partings, high ash content, high gas content and mediate-low permeability. The content of partings, which are groups of siltstone, mudstone and tuff, ranges from 15% to 55%. The cumulative thickness of pure coal ranges from 40 to 60 m. The ash content ranges from 20% to 70%, averaging 45%. Coal seams gas content is as high as 7% to 15%, benefitting from the dense rock block effect on the top and bottom, as well as the interplayers. The permeability ranges from 0.1 to 10 mD laterally. Parameters above show FCCM has good developing potential. Western slope of Nebo syncline is suggested as the favorable area, considering its good developing factors such as shallow buried depth of coal seams, relatively high permeability and effective gas preserve environment. Meanwhile, gas in partings can be considered in collaborative development strategy. Developing gas along with ash will be the focus of future development evaluation.


2011 ◽  
Vol 57 (2) ◽  
pp. 47-56
Author(s):  
Josef Chovanec ◽  
Petr Urban ◽  
Ivo Pěgřímek ◽  
Vitězslav Košnovský

Abstract The question of mining under the main haulage level as a way by which in some cases coal reserves can be effectively extracted is still discussed. The paper introduces advantages and disadvantages of this method. It presents examples of the bedding of a seam in a limited depth under level, for example 50 m, when the opening by the under level mining method is obviously more advantageous. Special attention is given to risks of ventilation short circuit which are higher in this method compared to classical opening. The paper also gives a brief economical reflection allowing to determine the efficiency of under level mining.


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