选矿的英文：
beneficiation
vann

Mechanical picker
机械选矿机

Peope said gold could easily be picked up by washing sand from the river in a pan of water.
据说，用一个选矿锅淘洗河里的砂子就可以很容易地把金子筛选出来。

Gold has been recovered from the ores by amalgamation for a long time past.
多年来该区该类型金矿的选矿一直采用混汞法收金或原矿浮选、产品销售冶炼厂的办法。

Some of this filtering is beneficial.
这种过滤有些是有益的。

The change is beneficial in some ways but not in others.
这些变革有的方面有好处,有的方面没好处。

A stay in the country will be beneficial to his health.
乡村生活有利于他的健康。

The fall in prices will be beneficial to small business.
物价下跌将对小企业有利。

International trade is beneficial for all participants.
国际贸易对所有参加国都有好处。