placer

详细解释:n. 砂矿, 砂矿开采地, 放置者, 得名次者

英语解释：

名词 placer:

an alluvial deposit that contains particles of some valuable mineral

例句：

A place where a placer deposit is washed to extract its mineral content.砂矿开采地一个用来清洗出有用矿物的砂矿开采地