The top coal caving method was initiated in the 1940's.In early 1990's this mehtod had been successfully introduced to longwal coal mines of China.It assures high productin,safety and low production cost.Yanzhou Mining group Corporation Ltd.has pioneered introduction of this innovate coal mining techniuqe,and uses extensively in thick seams.Many experimental practices,regarding modified mining system,caving supports,operaiton porcesses and mining parameters,ahve bene devleoepd to make this mining mehtod much more efficient and sophisticated.
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机译：顶级煤炭崩落法于1940年代启动。1990年代早些时候，这款Mehtod已成功介绍至中国的龙瓦煤矿。虽然确保了高品质，安全和低生产成本。兖州矿业集团公司有限公司宣传介绍这一创新煤炭矿业技术，广泛应用于厚煤层。大型实验实践，关于改进的采矿系统，洞穴支撑，操作龙头和采矿参数，Ahve Bene Devleoepd使这一矿井更加高效和复杂。
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