Assertion: placer mining | /r/HasProperty | the technique
Facets:
value: unlike hardrock mining
type: OTHER
Source sentences:
text: Placer mining is the technique by which gold that has accumulated in a placer deposit is extracted.
text: Unlike hardrock mining, which extracts veins of precious minerals from solid rock, placer mining is the practice of separating heavily eroded minerals like gold from sand or gravel.
text: Placer mining is the technique of extracting gold accumulated in a placer deposit.