Define ROM Mining Parameters
Use Define ROM Mining Parameters to generate Run-Of-Mine (ROM) grids, and automatically adjust the structure roof, structure floor and material thickness models to reflect the run-of-mine thickness.
For each horizon, you can specify the following parameters:
- Roof Loss
Thickness of coal lost from the roof of the seam (depletion). - Floor Loss
Thickness of coal lost from the floor of the seam (depletion). - Roof Gain
Thickness of waste material gained at the roof (dilution). - Floor Gain
Thickness of waste material gained at the floor (dilution). - Recovery
The recovery percent of the material remaining (after gains and losses).
The examples shown in the diagram below, refer to the entries on the second Mining Parameters panel.
ROM Grid
See Algorithm for further information concerning Run-Of-Mine grids.
Instructions
On the Grid Calc manu, point to Composite Models, and then click Define ROM Mining Parameters to display the Mining Parameters dialog box.
Enter, or select from the drop-down list, the name of the specification area.
Click OK to display the Mining Parameters panel
Horizons Box
Enter the seam names to use. It is necessary to specify mining parameters for each seam. Wildcards are accepted.
Roof Loss
Enter the roof loss value. A grid representing roof loss may be used, with the standard naming conventions enforced.
Floor Loss
Enter the floor loss value. A grid representing floor loss may be used, with the standard naming conventions enforced.
Roof Gain
Enter the roof gain value. A grid representing roof gain may be used, with the standard naming conventions enforced.
Floor Gain
Enter the floor gain value. A grid representing floor gain may be used, with the standard naming conventions enforced.
Recovery
Enter the percentage recovery. It is possible to enter a grid identifier instead of a percentage value.
Adjust Structure Grids
Select this check box to adjust the SR (structure roof) or SF (structure floor) grids where they become masked. See the diagram above. Burden models are recalculated to reflect the new structural grids.
Roof/Floor Masking
Select Move roof to floor if masked, Move floor to roof if masked or Leave as is where masked. See the diagram above.
Remove masks before saving
Select this check box to remove masks from the grids before they are saved (for mining purposes).
Losses and Gains
Accommodate losses and gains
These options raise the SF (structure floor) and lower the SR (structure roof) grids to accommodate for the new ROM thickness grids. Burden models are recalculated to reflect the new structural grids. Select one of the following:
Weight the difference. Select this option to weight the amount of thickness difference to the roof and floor. The default is a one-to-one weighting, where the roof and floor are adjusted equally. Enter values in the Roof Weight and Floor Weight fields.
Adjust by the loss value. Select this option to adjust the roof and floor by the amount of material loss only (depletion). The amount of waste gain (dilution) is not taken into account.
Use loss plus gain. Select this option to adjust the roof and floor by the combined amount of material loss (depletion) and waste gain (dilution). Unless the Recovery Factor is 100%, the material recovery factor is not accounted for and the resulting difference between SR and SF may not equal the ROM thickness.
Advanced
Remove loss from coal thickness
Select this check box to adjust the material thickness (TK) grid to reflect the ROM changes.
Push masked areas down to next
Select this check box to adjust the masked areas of the composited roof and floor grids pushing the masked (invisible) areas below the floor of the associated composited group (See diagram above). This option does not push the masked areas below other models that are not part of the same composited horizons.
Click OK.
Use the Save Grid Specifications option or select the Save Grid Specifications button 
from the Grid Calc toolbar to save the specifications.
