Coal mining trends, approaches, and safety hazards: a brief …
Extremely thin coal seam group contains coal seams having thickness below 0.8 m; thin coal seam group contains coal seams having thickness between 0.8 and 1.3 m and thick seam coal group contains coal seams having thicknesses above 1.3 m (Chai 2007; Dong and Pan 2008; Wang et al. 2012). Coal is commonly extracted from the both …
Overlying strata movement with ground penetrating radar …
The ZTR12-series ground penetrating radar equipment is used to detect the ... The characteristics of these five coal seams are as follows: the 5 # coal seam is a thin coal seam with high sulfur content and ... Cheng JY, Zhu PMet al. 3-D numerical simulation and dispersion analysis of in-seam wave in underground coal mine. Chinese J …
Design and dimensioning of sublevel stoping for extraction of thin …
Konkola copper mines (KCM) is an integrated mining operation comprising of open pit and underground mines (Nchanga and Konkola copper mines) Konkola mines is aptly referred to as Konkola deep and is, situated in Chililabombwe, Zambia. The mine is currently operating at 1150mL using sublevel mining method for copper ore bodies …
Highwall Mining: Design Methodology, Safety and Suitability
miner, it can recover thin-seam coals unsuitable for underground mining operations. As a ma t- ter of fact, the hig hwall mining method combined with contour mining would be most pr e-
Mining thin sub-layer as self-protective coal seam to reduce
Mining thin sub-layer as self-protective coal seam by drills along seam and hydraulic jet is a new technology of mining protective coal seam. As the most operations of this technology are implemented in coal seam, considering the efficiency of the mining by hydraulic jet and the security of the operations, this technology is only suitable for the soft …
Surrounding rock control theory and longwall mining technology
The surrounding rock coal mining brakes the equilibrium state of in situ stress filed. The surrounding rock experience deformation, destruction, caving and stability under the coupled action of mining stress field and supporting stress field (Gao and He 2010; Ju et al. 2012).Based on the independently researched and developed longwall mining …
(PDF) A new automated, safe, environmentally sustainable, and …
The mining equipment and mine layout were drawn using Creo Parametric and AutoCAD. ... According to Ma et al. [19], the key to the success of a remote operation is mining at a stable, short-term ...
TECHNICAL REVIEW OF THIN SEAM CLEARANCE …
• A number of technologies were identified from extra low profile (XLP) mining equipment and equipment used in other industries, which could be an alternate means for thin-seam transport applications. These outcomes could form a basis for future COALTECH proposals to address thin-seam production concerns in the South African coal industry.
Longwall Mining
As the mining machine advances into the solid coal panel, the roof supports also advance keeping overburden from collapsing into the exposed face of the coal. ... resources found in underground, thin seams represent only 1.9% of total resources. Although this represents a minimal amount, some sort of thin-seam machinery may be helpful in ...
AEXQ0612-01, Continuous Miners Product Line Brochure
in any seam thickness. The range includes machines capable of operating in seams from 0.76 m (30 in) to . 4.70 m (15.4 ft). Top Performance Underground . As the result of an all-out engineering effort, this complete range of miners is on the very cutting edge of underground mining technology. As part of our complete range of Room & Pillar
Development of an Underground Automated Thin-Seam Coal …
Research into autonomous machine guidance, coupled with developments of thin-seam mining equipment, offer new opportunities for devising mining layouts suitable for …
New advances in automatic shearer cutting technology for thin …
Automatic mining technology is the ideal path and the inevitable way to improve production efficiency, reduce labour intensity and ensure safety for thin coal …
an expert system for equipment selection of thin coal seam …
In order to balance productivity and prolong the service life of coal mine, the TCS are to be mined urgently in many mining areas, such as huaibei, huainan, Zibo, Yanzhou, Xinwen, …
An innovative approach to thin coal seam mining of complex …
1. Introduction. Thin coal seams are fairly pervasive in coal measures. For example, in China, the coal reserve of thin coal seams accounts for approximately 20% of total coal resource and its distribution covers over 85% of mining areas of China [1], [2].In order to maximise the recovery rate, the extraction of thin coal seams, especially for …
Advances in coal mining technology and sustainable mining …
Thin seams 0.4–1.3 m (1.3–4.3 ft) thick—In such thin seams, generally three types of mining methods are practiced, based on types of face equipment used, especially the cutting machines: a. If the seam height is less than 1.3 m (4.3 ft) and seam inclination <5 degrees, then a combination of a shearer cutting machine, AFC, and shields.
Waste rock filling in fully mechanized coal mining for goaf
A large amount of waste rock is generated during thin seam coal mining operations underground. The waste rock material stacked on surface also adds to the environmental pollution. So it is important to reduce the amount of waste rock by exploring gainful utilization methods. This paper deals with an investigation undertaken to develop …
Optimal Selection of a Longwall Mining Method for a Thin Coal Seam
The selection of a mining method is one of the most important decisions made by mining engineers. An appropriate fully mechanized mining method is of great importance to mining design and capacity planning for thin coal seams. Therefore, the comprehensive evaluation of alternative mining methods is an important part of mining …
Present situation of fully mechanized mining technology for steeply
For this method, because of the large dip angle of coal seam and the mining-induced stress distribution that is different from those of other types of underground mining (Hosseini et al. 2013; Monjezi et al. 2011; Verma et al. 2013), significant asymmetry is exhibited in the distribution, as shown in Fig. 4 (buried depth of the working face is ...
Fully mechanized coal mining technology for thin coal seam …
In view of the present situations and existing problems of thin coal seam mining under complex geological conditions, low-profile mining equipment for fully mechanized coal …
Coal mining method with near-zero impact on the ecological
In recent years, with the strategic adjustment of coal resources, the Northwestern high-intensity mining area has become China's main coal supply base (in 2017, the coal output of Shanxi, Shaanxi, and Inner Mongolia accounted for 66.82% of the country's total) (Guo et al. 2018).Meanwhile, with the acceleration of ecosystem …
Review on Improvements to the Safety Level of Coal Mines by
However, coal mine safety accidents are still high compared with other major coal producers due to the fact that 90% of coal is mined underground. Underground coal mining means more deadly hazards due to confined space, toxic and harmful gases, mine water, machinery, surrounding rock, and other dangerous sources [6,7].
Analysis and construction of the coal and rock cutting state
Improving the intelligent level of coal machinery equipment is one of the main tasks of coal mine intelligent development 1,2,3,4,5. Shearer is the core equipment of a fully mechanized mining face.
An innovative approach to thin coal seam mining of complex …
This provides a theoretical guidance for the fully-mechanised thin coal seam mining face with hard rock parting. The implementation of pressure regulation in actual …
Optimization Production Scheduling of Underground Backfilling Mining
In the green backfilling mining of underground coal mines, gangue in a coal seam is used to replace and fill goafs. However, the gas drainage time changes in the amount of gangue output and order in the extraction sequence of stope blocks, thereby changing the production output. A multi-objective integer programming model was …
Integration of protective mining and underground backfilling for …
Mining protective coal seams is an effective approach for coal and gas outburst control, but a large amount of gangue is usually produced when mining a thin protective seam and dealing with the gangue can be a challenging task. In the paper, a novel integrated mining system by extracting two panels simultaneously was …
A Review of Intelligent Unmanned Mining Current Situation and …
Intelligent unmanned mining is a key process in coal mine production, which has direct impact on the production safety, coal output, economic benefits and social benefits of coal mine enterprises. With the rapid development and popularization of 5G+ intelligent mines and coal mine intelligent equipment in China, the intelligentization of …
Key technologies and equipment for a fully mechanized top
Thick and ultra-thick coal seams are main coal seams for high production rate and high efficiency in Chinese coal mines, which accounts for 44 % of the total minable coal reserve. A fully mechanized top-coal caving mining method is a main underground coal extraction method for ultra-thick coal seams. The coal extraction technologies for coal …
The Recent Progress China Has Made in Green Mine …
With the development of technology, the concepts of "green" and "sustainable" have gradually been popularized in all walks of life. With the continuous development of the world mining industry, the efficiency of resource development in various countries has been improved, but mining activities and production will undoubtedly bring …
Development of an Underground Automated Thin-Seam Coal Mining …
It is predicted that coal mining in Southwest ia, and the economic stability that it brings to the area, will continue to decline over the next decade unless an environmentally sound, and economically viable means can be found to extract seams of high quality coal in the thickness range of 14 to 28 inches. Research into autonomous machine guidance, …
Multi-seam mining of the deep Waterberg resources
Where the No. 5 seam is mined it is thin i.e. less than 2 m and tends to be mined by underground mining methods. Multi-seam mining has also been carried out in the Natal coalfields, but the seams are generally thin (less than 1-2 m thick) and occur at an average depth of less than 160 m.