亚洲国产毛片aaaaa无费看-欧美视频一-成人免费在线观看-日本无翼乌邪恶大全彩h-国产黄a三级三级三级av在线看-青青操影院-国产v亚洲v欧美v专区-无遮挡国产-午夜视频在线观看免费完整版-不卡精品-日本一二三不卡-不卡在线-亚洲高清无吗-国产在线观看99-狠狠干夜夜骑-久草97-日本人与黑人做爰视频网站-欧美少妇网-好色成人网-日美韩一区二区三区

Jinshandian Iron Ore Mine, located in Jinshandian Town, Daye City, Hubei Province, is under Wuhan Iron & Steel Group Minerals Co., Ltd. and is among the four ferrous metallurgical mines that are difficult in mining. It consists of two mining area: Zhangfushan and Yuhuasi.

Pillarless sublevel caving method is adopted. The two mining areas of Zhangfushan and Yuhuasi are integrated and the primary production capacity of mine 1.5 million t/a is extended to 3 million t/a.

Main shaft and auxiliary shaft development is adopted for the mine. The depth of the main shaft is 924 m, and it was the deepest shaft at ferrous metallurgical mines. The application of one-time construction and equipping by stages reduced the effect on mine production in the transition from one stage to another. It is the first time to use double skip hoisting at ferrous metallurgical mines and the hoisting capacity is 3.5 million t/a. The modification and expansion project was put into production in 2007 with good operation.