placer mining

noun

🔊/ˈpleɪsə maɪnɪŋ/

🔊/ˈpleɪsər maɪnɪŋ/

[uncountable] (North American English)

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the process of getting gold or other valuable minerals, usually from a river or lake, by washing away the sand that surrounds it
- placer mining operations砂矿开采作业