shortwall — /shawrt wawl /, adj. Mining. pertaining to a means of extracting coal when the working face is about a third the length of the longwall system and mining is done by a continuous cutter rather than by longwall machinery. [1910 15; SHORT + WALL] *… … Universalium
shortwall — /shawrt wawl /, adj. Mining. pertaining to a means of extracting coal when the working face is about a third the length of the longwall system and mining is done by a continuous cutter rather than by longwall machinery. [1910 15; SHORT + WALL] … Useful english dictionary
coal mining — Coal was very important in the economic development of Britain. It was used as fuel in the factories built during the Industrial Revolution and continued to be important until the 1980s. The main coalfields are in north east England, the north… … Universalium
Underground mining (soft rock) — refers to a group of underground mining techniques used to extract coal, oil shale and other minerals or geological materials from sedimentary ( soft ) rocks. Because deposits in sedimentary rocks are commonly layered and relatively less hard,… … Wikipedia
Coal mining — Men leaving a UK colliery at the close of a shift Surface coal mining in Wyo … Wikipedia
Underground mining methods — A drift mine is driven horizontally into coal that is exposed or accessible in a hillside. In a hydraulic mine, high pressure water jets break the coal from a steeply inclined, thick coalbed that would be difficult to mine with the usual… … Energy terms
Underground mining equipment — A coal cutting machine is used in conventional mining to undercut, top cut, or shear the coal face so that coal can be fractured easily when blasted. It cuts 9 to 13 feet into the bed. Continuous auger machine is used in mining coalbeds less… … Energy terms
Underground mine — A mine where coal is produced by tunneling into the earth to the coalbed, which is then mined with underground mining equipment such as cutting machines and continuous, longwall, and shortwall mining machines. Underground mines are classified… … Energy terms
Haveuse — Une haveuse (du wallon Xhavée : fossé, tranchée, vallée) est une machine utilisée dans des travaux souterrains afin d extraire des matériaux. Elles ont été initialement utilisée dans les mines pour réaliser un trait, une saignée mince et… … Wikipédia en Français
