Assertion: cave's variety | /r/HasProperty | worked for general construction needs
Facets:
Source sentences:
text: A wide variety of stone has been worked for building and general construction needs (e.g. sand and gravel) while other minerals have been mined or quarried for the chemical industry (e.g. salt), the production of metals (e.g. copper and tin) or other uses (e.g. china clay).