wall rock
noun Mining.
the rock forming the walls of a vein.
Origin of wall rock
An Americanism dating back to 1855–60
Words nearby wall rock
wall pass,
wall pellitory,
wall pepper,
wall plate,
wall plug,
wall rock,
wall rocket,
wall rue,
wall socket,
wall street,
wall streeter
Example sentences from the Web for wall rock
In narrow lodes, some of the wall-rock must be cut away to get room for the workmen.
Hittel on Gold Mines and Mining |John S. Hittell
British Dictionary definitions for wall rock
wall rock
noun
rock that is immediately adjacent to a mineral vein, fault, or igneous intrusion