noun
placer; placer mineral
Geology term for mineral deposits in sand or gravel, especially those containing valuable heavy minerals like gold or tin.
この川の砂鉱から金が採れる。
Gold can be extracted from the placer deposits in this river.
砂鉱には錫やチタンなどの重鉱物が含まれる。
Placer deposits contain heavy minerals such as tin and titanium.