wall rock

noun Mining.
the rock forming the walls of a vein.

Origin:
1855–60, Americanism

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
wall rock
 
n
rock that is immediately adjacent to a mineral vein, fault, or igneous intrusion

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Gold is present as free grains in quartz, as blebs attached to wall rock
  ribbons, and in veinlets cutting sulfide grains.
The magma was dry and viscous as it invaded the metamorphic rocks and caused
  wholesale plastic folding of the wall rock structure.
Fluid-wall rock interaction increased fluid pH, causing precipitation of
  uranium minerals.
New geochemical evidence from the wall rock-vein contact will also be explored.
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