Surface mining works only when the coal seam is near the surface. It is, however, usually more cost-effective than underground mining and requires fewer workers to produce the same quantity of coal. And the industry reports that 90% or more of the coal is recovered, a higher proportion than from underground mining.Web

Liu J (2011) Practices on fully mechanized coal mining equipment matched and mining in thin seam of Datong mining area. Coal Science and Technology 39: 40–43. Google ScholarWeb

In view of the present situations and existing problems of thin coal seam mining under complex geological conditions, low-profile mining equipment for fully …Web

more than 75 percent of all thin seam coal worldwide and that mainly from the Ukraine. In Europe the mining techniques have been developed for deep mining conditions while in the U.S.A shallower and flatter seams have allowed for room and pillar methods. The largest producers of thin seam coal are the former U.S.S.R. and theWeb

Abstract. In view of the present situations and existing problems of thin coal seam mining under complex geological conditions, low-profile mining equipment for fully …Web

Section snippets Mining conditions of No. 16 upper and No. 17 thin coal seams. The No. 16 upper and No. 17 coal seams in Yanzhou mining area, China, are both thin. The thickness of No. 16 upper coal seam varies from 0.60 to 1.60 m while the No. 17 coal seam from 0.50 to 1.39 m. They are both of complex geological conditions, widely …Web

Coal seam that is thinner than a certain value is defined as thin coal seams (TCS). It commonly occurs in China as it covers 84.2% of the mining area. This …Web

A new coal mining machine that was going to pull some 40 million tons of coal from the Appalachian coalfields by 1986 has had more than its share of start-up problems. The machine, known as the Thin Seam Miner (TSM), is a $2.7-million auger-type mining machine that is designed to bore 220 ft into new or abandoned highwalls (CA 5/82 p. 106).Web

Dorstfontein Coal Mine has some 7.0S mil. tons of bituminous coal in a thin seam resource with heights varying from 1.2 to 1.4 m. The geological setting of this colliery makes it is a more difficult mine to operate and result in many mining problems. Some mining related problems in the past four years were due toWeb

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 & PillarWeb

when compared to vast coal seams, the mining conditions of thin coal seams are more complex due to the lower thick bottom of the coal seam and significant variance in angles, folds, and faults. Bołoz [33] introduced, in detail, the common mining methods in thin coal seam underground mining and the disorders in the mining …Web

Based on a comprehen- sive study of the mined coal seam structure with a complex texture, using the example of one of the mines, it has been revealed that in the formation of operational ash content, the friable roof caving amounts to 13.0%, the seam rock interlayers – 19.2%, the coal seam natural ash content – 12.8%, and the seam …Web

:89;6258=;: When a coal seam is influenced by mining activities, gas stored inside is liberated into the underground ventilation system. Gas emissions have created serious difficulties forWeb

The analysis of thin-seam coal clearance equipment cannot be isolated from the factors set out below. • Mining method – Specific mining systems are well suited to certain mining methods. For instance, continuous mining with shuttle cars is suited to the ... decide on either an underground or opencast mining process. The undergroundWeb

b) In room and pillar mining, the recovery rate is about 40–60%. Whereas in long wall mining method, the recovery rate is as high as up to 75%. c) In thick coal seams, long wall mining method is used, whereas in thin coal seam, room and pillar method is used. It has thickness ranging from 0.75 to 4.0 m.Web

China suffers the worst coal mine disasters in the world. Lots of miners lose their lives or suffer occupational injury. Fortunately, China is developing vigorously intelligent coal mining, which is the combination of traditional coal mining and the latest technology. Mining expects to relieve or solve coal mine safety, health and intensive labor issues …Web

Of the country's total minable coal reserves, 17.4% are thin seams (less than 0.8 meters [m] thick), 37.8% are classified as medium thickness (between 0.8 m and 3.5 m), and the remaining 45% have ...Web

In the United States, an unexpected and severe increase in coal miners' lung diseases in the late 1990s prompted researchers to investigate the causes of the disease resurgence. This study aims to scrutinize the effects of various mining parameters, including coal rank, mine size, mine operation type, coal seam height, and geographical location …Web

efficient to extract thin seam coal. Drill and blast methods need reasonable heights and space and currently the equipment on the mine is too high for the thin seam areas. Drill and blasting below the parting causes it to break and separate which defeats the whole object of excluding the sandstone from the R.O.M. The eM operation wouldWeb

The new advances that several manufacturers are developing to address the integration of mining and continuous haulage systems are also investigated. That …Web

As semi-underground and semi-surface mining methods, the auger and highwall mining methods are used to extract the remaining coal reserve after the economic threshold imposed by the stripping ...Web

seams with thickness of 0.8~1.3 m are in the thin coal seam group and thickness of less than 0.8 m are in the extremely thin coal seam group (Chai, 2007; Dong and Pan, 2008). With the decreasing of coal resources with seam thickness in the middle to thick range, more and more thin coal seams will have to be mined in the future (Li et al., 2005).Web

Auger mining technology in the underground ver- sion also utilizes the method of drilling, which is used for the exploitation of thin and residual seams. Min- ing consists ofthe selective excavation of the seam Fig. 4. Auger miner: a) BryDet's BUA 600 machine; through large-diameter entries.Web

Coal mining - Underground mining: In underground coal mining, the working environment is completely enclosed by the geologic medium, which consists of the coal seam and the overlying and underlying strata. …Web

Natural condition of coal seam in Japan (1956) Working depth (Average) 334.7m (Maximum) 836m Average thickness of seam 1.71m Average thickness of coal 1.31m Output from coal face 48.281Mill. t.Web

Last Updated: 12 Nov 2023. PDF | The mining environment of thin coal seam working faces is generally harsh, the labor intensity is high, and the production …Web

Coal and rock boundary of 1.1-m thin coal seam working face Figures - available via license: Creative Commons Attribution 4.0 International Content may be subject to copyright.Web

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 …Web

Request PDF | On Jan 1, 2018, Łukasz Bołoz published Mining of thin coal seams using surface-underground methods | Find, read and cite all the research you need on …Web

Figure 2. Non-fatal day lost incident rate for small and medium/large underground coal mines for 1998-2008. [1] During 2008, an estimated 5.2 million tons of coal were produced in the U.S. from thin seams deposits with operating heights less than 1.06 m (42 inches). This represents approximately 14.5% of the total U.S. underground coal production.Web

730C-series thin-seam underground coal mining machine is presently a domestic thin-seam long-boom mining machine of advanced performances, featuring low machine …Web

More than 85% of the mines in China have thin coal seam < 1.3 m, which is mainly mined as protective layer for the lower coal seam. Due to the unsteady thickness of the thin coal seam, the mining space is narrow and small. There has been a contradiction between the capacity and the size of equipment.Web

This thesis presents a brief overview of current technologies utilized for underground coal mining in the United States. This is followed by a review of developments in highwall mining that are potentially applicable in underground mining of thin seams. Some …Web

autonomous mining machines is also presented. The new advances that several manufacturers are developing to address the integration of mining and continuous haulage systems are also investigated. That background is employed in devising a conceptual mining system for the underground mining of coal seams in the 14 to 28 inch range of …Web