吃奶揉捏奶头高潮视频丨黑人巨大亚洲一区二区久丨人善交video另类hd国产片丨亚洲 欧美变态 另类 综合丨一本到高清丨在线播放亚洲第一字幕丨久久婷婷五月综合97色丨久久亚洲网站丨亚洲精品无码一区二区三区久久久丨久久久久久久亚洲国产精品87丨成人性生交大片免费看中文视频丨女人十八毛片嫩草av丨新版天堂资源中文8在线丨日韩手机看片丨国产爆操视频丨超碰影院在线观看丨亚洲色图40p丨好看的黄色网址丨av日韩在线播放丨亚洲天堂一二三丨欧美大色丨都市激情自拍丨在线播放成人丨在线激情小视频丨特级无码毛片免费视频

Tongkuangyu Copper Mine, located in Yuanqu County, Shanxi Province, is a main mine of North Copper Co., Ltd., is the only mine in China with large-scale block caving method and is a completed underground mine with the largest production capacity.

Tongkuangyu Copper Project Phase II was put into commissioning in March 2011, and the mining and beneficiation capacity is 6 million t/a. Block caving method with medium-length hole jumbo and large LHD is used. It is the first time in China to arrange levels by trackless mining process. Underground belt hoisting system with the longest single section, and parallel double-incline (belt incline and ramp) + blind skip-cage shaft development system are adopted.

Tongkuangyu Copper Concentrator modification and expansion project was put into operation in September 2012, with smooth process flow and stable production. Both beneficiation capacity and product indexes meet the design requirements.