Longwall mining definition
Longwall mining means a system of mining designed for full pillar extraction that minimizes the possibility of outburst or squeezes and allows total caving of the main roof in the pillar area.
Longwall mining means a mechanised or manual method in which long open voids (slots) left after ore extraction are left to subside and get filled with surrounding rock;
Longwall mining means a type of underground mining where coal is extracted mechanically from a coalface typically around 250-350m in length. The coalface is generally equipped with a machine, known as a “Shearer”, that cuts the coal and loads it onto an Armoured Face Conveyor (AFC) that runs the length of the coalface. The face is accessed by two parallel roadways that are used for transporting produced coal away from the face as well as materials, services and ventilation. After each pass of the shearer, the face supports are advanced and the strata behind the coalface is allowed to collapse.
Examples of Longwall mining in a sentence
Investing in and providing Longwall mining machinery and other mining machinery for for gate road ways development and extraction of longwall panels, mining coal and transport of the same to the designated transfer point on surface.