Assertion: room | /r/HasProperty | effective
Facets:
value: due to the fact
type: CAUSE
value: compared to strip mining
type: OTHER
value: at particularly deep depths
type: OTHER
value: more cost
type: DEGREE
Source sentences:
text: At particularly deep depths, room and pillar mining can be more cost effective compared to strip mining due to the fact that significantly less overburden needs to be removed.