Longwall method of mining renders for full face mechanization, utilizing high rated coal cutting machines and large capacity powered supports to provide safety in the working face area.

Longwall mining is the only technically proven and established method worldwide for coal extraction at greater depth. In this paper, 2D plane strain finite element models of longwall panels...

Typical longwall panel configuration showing the shearer, goaf, coal block, roof supports, AFC, conveyor belts and gate roads. The straight arrow indicates the direction of mining (Image courtesy...

Longwall mining is a form of underground coal mining where a long wall of coal is mined in a single slice (typically 0.6–6.0 m (2 ft 0 in – 19 ft 8 in) thick). The section of rock that is being mined, known as the longwall panel, is typically 3–4 km (1.9–2.5 mi) long, but can be up to 7.5 km (4.7 mi) long and 250–400 m (820–1,310 ft) wide.

LONGWALL MINING Overview In the method of secondary extraction known as longwall mining a relatively long mining face (typically in the range 100 to 300m but may be longer) is created by driving a roadway at right angles between two roadways that form the sides of the longwall block, with one rib of this new roadway forming the longwall face.

INTRODUCTION TO LONGWALL MINING AND SUBSIDENCE. 1.1. The Longwall Mining Process. Fig. 1.1, below, shows a cutaway diagram of a typical longwall mine. The main features of the mine are indicated in the key below the diagram. The longwall face is indicated by the number 8 in the diagram. 5. Coal preparation plant. 6. Coal storage bins. 7.

Longwall mining machines are about 800 feet (240 meters) in width and 5 to 10 feet (1.5 to 3 meters) tall. Longwall miners extract "panels" - rectangular blocks of coal as wide as the mining machinery and as long as 12,000 feet (3,650 meters). Massive shearers cut coal from a wall face, which falls onto a conveyor belt for removal.

Longwall mining is a fast and mechanized method of coal mining where a large “wall” of coal is mined with a high-powered cutting system and the coal is transported out of the mine through a network of conveyors. The method is a “caving” method and the surface above the “gob” or mined areas typically subside.

2012年9月4日 · Longwall mining applies to thin, bedded deposits, with uniform thickness and large horizontal extension. Typical deposits are coal seams, potash layers or conglomerates, trona, and gold reefs. Longwalls are found in nearly horizontal deposits of coal and trona, whereas in metal/nonmetal deposits, a steeper dip is tolerated.

An ignition of gas occurred when picks of a longwall shearer, striking a quartz nodule, generated an incedive spark in the presence of methane. Continued attention to the replacement of broken and damaged picks, post pick flushing sprays, and provision of ventilation sufficient to prevent accumulations of flammable gas were identified as ...