Experimental Study of the Inclined Slices Sublevel Caving Method in Xingshan Iron Mine

doi:10.12068/j.issn.1005-3026.2021.12.011

Abstract

Abstract: The orebody in Xiaoxingshan mining area of Xingshan iron mine is layered inclined thick.Originally， the sublevel caving method without sill pillar was used for mining with drift perpendicular to strike， resulting in high ore loss and dilution， serious underground pressure behavior at hanging wall side of drift， large amount of roadway support engineering， and so on.Therefore， the inclined slices sublevel caving method is proposed. Along the deepening direction， orebody is mined according to the inclined line from the hanging wall to the footwall.An induced caving drift was arranged in each orebody slices.Current sublevel ore is caved， meanwhile the orebody near the hanging wall is also induced to cave naturally， and the caved ore is mined by the recovery drift set in the footwall surrounding rock. This method conforms to the movement law of ore caving in the inclined orebody， reduces the total cost of development and cut engineering.The experimental stope has been mined since May 2019， and now two sublevels has been mined， the ore recovery rate increased from 74% to85.6%， and the dilution rate has been reduced from 18% to 15%. New method has achieved good technical and economic indexes.

Key words: inclined thick orebody; inclined slices sublevel caving method; ore mining indexes; induced caving; stope structure

CLC Number:

TD853.36

QIAO Xia-liang， REN Feng-yu， CAO Jian-li， SHI Hong-wei. Experimental Study of the Inclined Slices Sublevel Caving Method in Xingshan Iron Mine[J]. Journal of Northeastern University(Natural Science), 2021, 42(12): 1747-1752.

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