thick seam meaning in Chinese

厚层
厚煤层
原矿层

Gas control in outburst thick seam face with caving mining
高突厚煤层放顶煤工作面瓦斯治理
Experiences of fully mechanized longwall top caving mining in thick seam
厚煤层综采放顶煤开采经验
Practices on fully mechanized coal caving in deep inclined thick seam
综放工作面布置顶煤巷道的探讨
Analysis of longwall top coal caving in thick seams with parting band
含夹矸厚煤层综放开采技术分析
Fire prevention and control of extra - inflammable thick seam with caving mining
极易燃厚煤层放顶煤火灾防治

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