Assertion: gas's quantity | /r/HasProperty | removed
Facets:
value: in order to access the ore
type: PURPOSE
Source sentences:
text: As a result, the quantity of material that must be removed in order to access the ore may be very large.
text: Underground mines have relatively small surface disturbance and the quantity of material that must be removed to access the ore is considerably less than in the case of an open pit mine.