Preliminary Research on Shaft Closure Technology in Transition Period from Open-pit to Underground Mining at Miaogou Iron Ore Mine
Based on the current infrastructure construction status of the open-pit-to-underground mining project of Miaogou Iron Mine of HBIS Group Mining Co.,Ltd.,in order to ensure the safe,fast and efficient completion of the overall project,after the smooth completion of the temporary construction at 240 m horizontal level of the main shaft,the equipment and facilities of the main shaft above the ground surface such as the headframe are dismantled,and the existing hoisting facilities of the main shaft are retained before the temporary closure of the shaft.In order to better solve the problem of simultaneous construction of underground infrastructure and main shaft tower on the ground surface at Miaogou Iron Ore Mine,this shaft closure technology with double-deck shaft cover has been researched,and by this technology the tensioning of shaft guide wire ropes,the suspension of steel wire ropes,the coiling of surplus steel wire ropes,and the closure and protection of the shaft are all achieved,which better guarantees the steady advancement of the open-pit to underground mining project of Miaogou Iron Mine.
transitioning from open-pit to undergroundtemporary constructionshaft closuresimultaneous construction
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