Scholarlink

<p>At Hindustan Zinc’s Sindesar Khurd mine an underhand mining methodology has been used to extract the lead-zinc ore from below a depth of 800&#xa0;m. The rock mass encountered during development and stoping presents challenging mining conditions due to significant strength contrasts, foliation, the presence of faults, and shear zones. For extraction of minerals, the methodology involves back filling of the stopes after they are extracted with cemented paste fill (CPF) which is composed of mill tailings. In this mill tailings, 4% and 10% cement are added as a binder for plug and bulk filling, respectively. The physcio-mechanical properties of CPF samples are determined at different binder percentage in the laboratory. Numerical modelling with FLAC3D is undertaken to evaluate the stability of the 4.8&#xa0;m x 4.8&#xa0;m drive development in CPF and of the stopes extracted below this development. The laboratory testing and numerical modelling results indicated that the CPF developed sufficient strength for development within 7 days and achieved the required strength for underhand stopping after 35 days. The roof exposure of CPF considered in the analysis, ranging from 148&#xa0;m² to 607&#xa0;m², was estimated from Cavity Monitoring Survey (CMS) data. Instrumentation including tell-tales, multi point borehole extensometers and cavity monitoring scans have been used to assess and validate the results. In essence the engineered CPF exhibits better stability and mining conditions than the rock mass it has replaced proving that underhand mining is a suitable mining methodology for extracting ore in complex and difficult geology and mining conditions.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Design and Stability Analysis of Stopes and Drives in a Paste Backfilled Underhand Mining System

  • 期刊论文

  • 发表日期：

    2026年7月2日

查看全文
  • Pradeep Kumar,
  • Rakesh Kumar,
  • Debasis Deb,
  • David Finn

摘要

At Hindustan Zinc’s Sindesar Khurd mine an underhand mining methodology has been used to extract the lead-zinc ore from below a depth of 800 m. The rock mass encountered during development and stoping presents challenging mining conditions due to significant strength contrasts, foliation, the presence of faults, and shear zones. For extraction of minerals, the methodology involves back filling of the stopes after they are extracted with cemented paste fill (CPF) which is composed of mill tailings. In this mill tailings, 4% and 10% cement are added as a binder for plug and bulk filling, respectively. The physcio-mechanical properties of CPF samples are determined at different binder percentage in the laboratory. Numerical modelling with FLAC3D is undertaken to evaluate the stability of the 4.8 m x 4.8 m drive development in CPF and of the stopes extracted below this development. The laboratory testing and numerical modelling results indicated that the CPF developed sufficient strength for development within 7 days and achieved the required strength for underhand stopping after 35 days. The roof exposure of CPF considered in the analysis, ranging from 148 m² to 607 m², was estimated from Cavity Monitoring Survey (CMS) data. Instrumentation including tell-tales, multi point borehole extensometers and cavity monitoring scans have been used to assess and validate the results. In essence the engineered CPF exhibits better stability and mining conditions than the rock mass it has replaced proving that underhand mining is a suitable mining methodology for extracting ore in complex and difficult geology and mining conditions.