- In the stone coal layer and the overlying black shale, there is a pyrite layer.
- The oil shales are associated with and lie on a coal layer of turfy-swampy facies.
- The widely distributed coal layer adsorbed gas is also an important potential natural gas resource.
- Wennan colliery of Xinwen Coal Mining Group is an old coalmine and is mining deep coal layer.
- The forming mechanism of the black fume from coal layer type combustion and the measures for elimination the fume kilns are discussed.
- COF direct reduction process,in which carbon-bearing pellet bed covered by a coal layer is open-flame heated, has been investigated.