Pillar and breast. The name of a common mining method.
Pinch. See [Crush.]
Pitch. See [Dip.]
Plane. Any incline on which a track is laid for the purpose of lowering or hoisting coal.
Pockets. Receptacles at the lower ends of shutes, in breakers, from which coal is loaded into railway cars.
Post. A wooden prop to support the roof in bituminous mines.
Prop. A timber set at right angles to the seam, in anthracite mines, to support the roof.
Prospecting. Searching for indications of coal on the surface, and testing coal seams from the surface.
Pump way. That compartment of a shaft or slope down which the pump rods and pipes are extended.