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 t 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.
维普
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