Define Volume Overbreak Slough (VOS)

VOS models dilution as volumes surrounding the stope, offering more flexibility for defining asymmetric or staged dilution. This can be useful for bulk mining.

This type of dilution is defined as the proportion of waste volume added relative to the stope volume.

Also see Define Equivalent Linear Overbreak Slough (ELOS).

  1. Define an MSO scenario, block model and other optional settings.

  2. Display the Dilution screen.

  3. Select the VOSDilution Type.

  4. Define the spatial context where dilution is applied using Application:

    • Geological – Applies dilution relative to geological zones (Near / Far)

    • Geometric – Uses geometric rules based on stope faces (Hangingwall / Footwall)

  5. Choose how dilution values are defined, using Dilution Source:

    • Single Value – Same dilution value applied to all stopes.

    • Model Field – Reads values from block model fields.

    Note: You cannot use the Curve Table option with the VOS Dilution Type.

  6. Complete both sets of dilution settings for the opposite aspects of the stope.

    Note: Geometric and Geological method fields are identical but relates to hangingwall/footwall and near/far aspects respectively.

    • Bottom Dilution – The amount of dilution added to the bottom portion of the wall (near the stope boundary).

    • Lower Middle Dilution – The dilution value for the lower-middle segment of the wall.

    • Upper Middle Dilution

    • Top Dilution

  7. If you selected the Model Field Dilution Source:

    • Field – Select the block model attribute containing dilution values.

    • Default Value – Define a value to be used in the absence of model data for a specific cell.

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