Mining method and apparatus
OwnerKlaus Spies, Harry J. Fitzgeraldinventors
Life of this patent
Estimating the term…
Abstract
A method of single-entry mining of coal and analogous minerals is disclosed, which permits substantially 100% extraction of the coal or other mineral in a seam. All operations are carried out under hydraulic steel roof supports adjacent the mine face; farther back the roof is supported by non-yielding cast-in-situ pillars of quick-setting concrete rather than coal pillars or other supports. Mining machinery for these purposes is also disclosed.
Claims7
A method of removing coal from an underground coal panel, comprising the steps of advancing a head gate along one side of the panel and retreating a tail gate along the other side of the panel, while removing coal from a mine face which extends from one to the other of said sides;
- and setting a plurality of rows of non-yielding roof-support posts of quick-binding concrete along said gates during the advancement and retreat thereof, respectively, and before supported strata above the mine roof can begin to subside.
Dependencies are inferred from the claim text.