The mining practice of sub-level longwall face in Yima coal mine of Henan Province was introduced. These techniques could be used in coal mines with similar condition.
开采结果表明，论文中提出的对岩层结构的认识和采取的控制技术是正确的，可以在条件相似的矿区推广应用。
There are several important centers of coal production in Henan, including Pingdingshan, Yima, and Jiaozuo.
河南有多个重要的产煤中心，包括平顶山，义马和焦作。
There are several important centers of coal production in Henan, including Pingdingshan, Yima, and Jiaozuo.
河南有多个重要的产煤中心，包括平顶山，义马和焦作。
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