Opencast to underground iron ore mining method

Abstract

At the end of the open-pit mining process in large metal mines, the mining model must change from open-pit mining to underground mining, but the mutual interference between the two mining models leads to poor production safety conditions and difficulties in production convergence during the transition period. To solve these technical problems of poor production safety conditions and difficulties in production convergence during the transition period, in this study, based on the case of the Dagu Mountain Mine, a new transition mode of wedge switching for collaborative mining is proposed and established, which is suitable for collaborative mining. This new mining process completely eliminates the boundary pillar and the artificial covering layer, combining the technology of the mining-induced caving method and the technology of deep mining at the bottom of the open-pit. The results show that 1) the optimization of the open-pit boundary reduces the amount of rock stripping, and 2) it achieves a stable transition of collaborative mining capacity. The study shows that the proposed method uses the technologies of the mining-induced caving method in underground mining and deep mining at the bottom of the open pit in open-pit mining, and the method then optimizes the open-pit mining in detail by comparing the advantages of open-pit mining and underground mining. This study provides true and accurate technical support for the transition from open-pit mining to underground mining.

摘要

在大型金属矿山露天开采的末期, 需要经历露天开采转地下开采的过渡时期, 但两者存在着相 互干扰的问题, 造成过渡期安全生产条件差和产能衔接困难。为了解决过渡期开采安全条件差和产量 衔接困难等技术难题。本文以大孤山矿山为例, 针对过渡期矿体条件, 提出并建立了适合协同开采的 楔形转接新型过渡模式, 其完全取消了境界矿柱以及人工形成覆盖层的工艺, 并将挂帮矿诱导冒落法 开采技术与露天底部矿量陡帮延深开采技术有机结合, 用于实际开采过程中。结果显示, 1) 露天境 界细部优化减少岩石剥离量, 2) 实现协同开采过渡期产能稳定衔接。研究表明, 该方法地下采用诱 导冒落法开采挂帮矿, 露天采用陡帮开采工艺开采坑底矿, 按露天与地下开采工艺的优势对比优化露 天延深开采的细部境界, 本研究在一定程度上为过渡期矿山露天转地下开采提供了真实准确的技术支 撑。