塞紫金矿下部矿带自然崩落法采场空场崩落协同法拉底技术研究

Research on the collaborative faraday technology for open pit caving in the natural caving method of the lower mining belt of Saizijin Mine

塞紫金矿下部矿带为厚大斑岩型铜矿体,埋藏标高-500~-2000m,设计采用自然崩落法回采,-780m中段为拉底层,矿山目前正在回采上部矿带的主矿体和UZ-2矿体,下部矿带正在基建过程中,由于下部矿带投产后,除北部少数区域矿体回采不会对上部矿体造成影响,其余绝大部分区域均会影响上部UZ-2矿体的回采。因此,在UZ-2矿体和下部矿带同时生产区间,拟采用空场法的方式对下部矿带自然崩落法回采的-780m拉底层进行局部回采,在保证下部矿带拉底进度及矿山整体生产能力的同时,避免对UZ-2矿体回采的影响。研究根据矿山基建进度计划及-780m拉底层矿量确定了空场法拉底首采区域,对自然崩落法采场空场崩落协同嗣后拉底工艺进行了对比分析,对采场结构参数进行了分析计算的同时推荐了矿柱崩落方式,对关键工程及空场法嗣后拉底生产能力进行了论述,对自然崩落法回采的矿体预先采用空场法嗣后拉底回采后续存在的问题及研究方向进行了探讨。

The lower mining belt of Saizijin Mine is a thick porphyry copper deposit buried at elevations ranging from-500 m to-2000 m.The mining method adopted is block caving,with the-780 m level being the undercut stage.Currently,the mine is in the process of extracting the main ore body of the upper zone and the UZ-2 ore body,while the lower zone is under development.Upon the commencement of production in the lower zone,except for a few areas in the northern part that won’t impact the upper zone,the majority of the areas will affect the extraction of the UZ-2 ore body.To address this,during simultaneous production from the UZ-2 ore body and the lower zone,a method using open stope is proposed to locally mine the-780 m undercut of the lower zone while ensuring progress in the lower zone’s undercutting and the overall mine production capacity,without affecting the UZ-2 ore body extraction.The study defines the initial extraction area for the void mining method based on the mining development schedule and the ore quantity at the-780 m undercut.Comparative analyses of the undercutting process using the void mining method after initial extraction are conducted.Analysis and calculations of excavation structural parameters are performed,and a recommended ore column collapse mode is proposed.Discussion revolves around key engineering aspects and the production capacity of the open stoping with subsequent undercutting after initial extraction.The study also delves into potential issues and research directions related to the application of the void mining method after initial extraction using natural caving mining methods.