Abstract: A portable wall section for incorporation in a mine stopping or for use as a mine permanent stopping or seal form, comprising vertically extensible panels secured in side-by-side relation, a stopping installed in a mine, a stopping system utilizing one or more of said sections, and methods of installing the stopping and form.

Abstract: A mine door system adapted for installation and a passageway in a mine, comprising a door frame adapted to be installed in the passageway and defining a doorway spaced below a ceiling of the passageway and mine doors hingedly mounted on the door frame for movement between open and closed positions. The system further comprises a top panel structure for substantially closing the space between the door frame and the ceiling of the passageway, the top panel structure being readily contractible heightwise of the passageway without loss of its structural integrity to accommodate a convergence of the ceiling and floor of the passageway without any substantial heightwise deformation of the door frame.