注浆固结法在残矿回收中的应用.

In response to the issue of resource depletion in an old gold mine, this study proposes 2 recovery schemes to effectively utilize shallow high-grade residual ore resources: one with reserved crown pillars and one without. The reserved crown pillar scheme includes options for 1 m and 0.5 m pillars, while the no reserved pillar scheme involves grouting consolidation with thicknesses of 5 m and 10 m. Based on the results of numerical simulations, the joint support method of partial crown pillar reservation and grouting consolidation of dry backfill materials was selected, with a reserved crown pillar thickness of 1 m and grouting consolidation thickness of 5 m. The process flow for residual ore recovery is detailed. By grouting and consolidating the existing loose backfill material in the upper voids of the trial stope, 4 500 1 ores containing 24 kg gold were successfully recovered, yielding an economic benefit of 6.619 8 million yuan. The success of this trial will continue to guide future residual ore recovery efforts in the enterprise. [ABSTRACT FROM AUTHOR]