second mining meaning in Chinese

二次回采

Fire analysis and control after second mining of a fire district
封闭火区复采防火分析与治理
Influence of second mining of coal seams on crosscut and countermeasures
煤层复采对石门的影响及对策
Application of comprehensive fire prevention and control technique in second mining of old mine
综合防灭火技术在老窑复采中的应用
Research on ground behavior regularity and control technique in second mining face of jushan coal mine
莒山煤矿复采工作面矿压显现规律与控制技术研究
The state shall encourage coal mining enterprises to carry out second mining or extract residual coal at the margins of mining areas and very thin coal seams
国家鼓励煤矿企业进行复采或者开采边角残煤和极薄煤。