Abstract: A form for making a permanent mine stopping of pourable and hardenable material such as concrete. The form comprises two sets of elongate extension panels, each set including a plurality of panels which may be erected to extend vertically in side-by-side relation from the floor to the roof of a passageway in a mine. When erect, the two sets of panels form two generally vertical walls spaced from one another to define a space to be filled with a pourable and hardenable material to form the stopping. Each panel comprises a pair of elongate sheet metal members having a telescoping sliding fit with one another to permit adjustable extension of the panel to fit the height of the passageway. Tie bars hold the walls of the form in spaced, generally parallel relation prior to, during and immediately after filling of the space between the walls with the pourable and hardenable material.