This primitive form of placer mining is still used in some places for panning gold.

这种原始的砂矿开采形式至今还在一些地方用来淘金。

youdao

I got educated on placer mining, and heard all about the controversy over the use of water cannons.

我得到的教育砂金开采，并听取了所有的争议，使用水炮。

youdao

Placer mining is based on the FACT that heavier substances can be separated from lighter ones in water.

较重的物质可在水中与较轻的物质分离，砂矿开采正是利用这个原理。

youdao

Dines likes, among others, mining concerns Placer Dome (nyse: PDG - news - people ) and Hecla Mines (nyse: HL - news - people ).

FORBES: Magazine Article

Placer Dome has joined Rio Tinto and three other mining houses to form the World Alliance for Community Health.

ECONOMIST: Companies and health