Class c: establish mineral exploration infrastructure.

丙级：勘查工程施工。

Class c: solid mineral exploration; geophysical exploration.

丙级：固体矿产勘查；地球物理勘查。

Class B: liquid mineral exploration; geophysical exploration.

乙级：液体矿产勘查；地球物理勘查。

Class c: solid mineral exploration; rock ore appraisal and testing.

丙级：固体矿产勘查；岩矿鉴定与岩矿测试。

Mineral exploration activity is being focused on large or giant ore deposits.

评价和区分大型矿床，一直是近年矿产勘查活动的焦点。