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.
A. Abutment - In coal mining, (1) the weight of the rocks above a narrow roadway is transferred to the solid coal along the sides, which act as abutments of the arch of strata spanning the roadway; and (2) the weight of the rocks over a longwall face is transferred to the front abutment, that is, the solid coal ahead of the face and the back ...
Since initially earning ownership of the Barruecopardo Tungsten Project, Ormonde has successfully defined, designed, permitted and funded, – and is now managing the development and bringing into production of what is one of the world's premier undeveloped tungsten mining projects outside of China.
Method used depends greatly on the mineral's location Mining allows for the extraction of minerals from the Earth. There are many materials that can be mined. The location of the mineral and its proximity to the surface typically determines the type of mining that is used.