露天煤矿开采 meaning in Chinese

open cast coal mining

The way of controlling blasting cost during opencast coal mining
降低露天煤矿开采爆破成本的途径与实践
Influence of ecoenvironment and the problem to be solved due to open pit excavation
露天煤矿开采对生态环境的影响及其亟待解决的问题
Study on environmental problems raised by china ' s opencut coal mine mining and prevention amp; amp; mitigation measures
我国露天煤矿开采环境问题及防治对策研究