What is another word for wall rock?
Pronunciation: [wˈɔːl ɹˈɒk] (IPA) 
Wall rock is a term used to describe the rock that forms the walls of a mine or tunnel. There are several synonyms for wall rock, including country rock, host rock, and wall stone. Country rock refers to any rock that surrounds and encloses an ore deposit, while host rock specifically refers to the rock that hosts the mineralization of the deposit. Wall stone is a more general term that can refer to any type of stone used in construction or as a barrier. Regardless of the synonym used, wall rock is an important component in underground mining and tunneling operations, providing structural support and stability for the surrounding area.
