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Uniform conditioning (UC) method has been historically applied to estimate recoverable resources on a sedimentary uranium deposit in Niger, currently mined. Uniform conditioning method is implemented on panel grid, which cell size is based on exploration and development drillhole spacing, usually scarce, that’s why proportions must be calculated to correctly approximate tonnages of, for example, ore, mined quantities in a given period of time etc. As sub block model cannot be used with uniform conditioning, an alternative of the intersection method would be to locate the uniform conditioning (LUC) results on the selective mining unit (SMU), however this creates artifacts in their continuity. This paper proposes another method, being to perform uniform conditioning directly on the SMU, so that monthly and annual depletions would be possible on the SMU scale, without going through proportion calculation. Whatever the cut-off grade considered, the results are comparable between uniform conditioning performed on the panel grid and on the SMU one, with differences being below 5%. When comparing the LUC results with the UC on panel grid ones, results are also very close, with differences around 1% in terms of metal, tonnage and grade. When the SMU are selected by the mineralized envelope, the LUC results and UC on the SMU grid differ between –2 and 5%. Artifacts showing pattern linked with the SMU ordering can be seen on the LUC results displayed on cross sections, which is not the case for UC on the SMU grid. To fully validate the UC on SMU grid method, it would be necessary to perform reconciliations between production results and UC on SMU grid results and determine a method to fix the threshold on the ore proportions.

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Uniform Conditioning Applied to the Selective Mining Unit as an Alternative to Localized Uniform Conditioning

  • 会议论文

  • 发表日期：

    2025年

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  • M. C. Febvey,
  • J. Rivoirard,
  • Z. Jannel

摘要

Uniform conditioning (UC) method has been historically applied to estimate recoverable resources on a sedimentary uranium deposit in Niger, currently mined. Uniform conditioning method is implemented on panel grid, which cell size is based on exploration and development drillhole spacing, usually scarce, that’s why proportions must be calculated to correctly approximate tonnages of, for example, ore, mined quantities in a given period of time etc. As sub block model cannot be used with uniform conditioning, an alternative of the intersection method would be to locate the uniform conditioning (LUC) results on the selective mining unit (SMU), however this creates artifacts in their continuity. This paper proposes another method, being to perform uniform conditioning directly on the SMU, so that monthly and annual depletions would be possible on the SMU scale, without going through proportion calculation. Whatever the cut-off grade considered, the results are comparable between uniform conditioning performed on the panel grid and on the SMU one, with differences being below 5%. When comparing the LUC results with the UC on panel grid ones, results are also very close, with differences around 1% in terms of metal, tonnage and grade. When the SMU are selected by the mineralized envelope, the LUC results and UC on the SMU grid differ between –2 and 5%. Artifacts showing pattern linked with the SMU ordering can be seen on the LUC results displayed on cross sections, which is not the case for UC on the SMU grid. To fully validate the UC on SMU grid method, it would be necessary to perform reconciliations between production results and UC on SMU grid results and determine a method to fix the threshold on the ore proportions.