placer mining

常見(jiàn)例句

This primitive form of placer mining is still used in some places for panning gold.
這種原始的砂礦開(kāi)采形式至今還在一些地方用來(lái)淘金。
chinafanyi.com
Mechanized placer mining, with special devices for washing and separating waste from valuable minerals, is used in productive alluvial deposits.
機(jī)械化砂礦開(kāi)采用于含礦量豐富的砂礦床．利用專門(mén)設(shè)備來(lái)淘洗、分離廢物與有用礦物。
In conducting coastal open air placer mining or shore-based well drilling to exploit seabed mineral resources, effective measures must be taken to prevent pollution to the marine environment.
露天開(kāi)采海濱砂礦和從岸上打井開(kāi)采海底礦產(chǎn)資源，必須采取有效措施，防止污染海洋環(huán)境。

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