PS. Preschedule

Owned by iarmstrong
Last updated: Aug 17, 2022
5 min read

In the Preschedule step set the proportion remaining to drill, charge, or mine.

Set the ratio remaining in each activity, in each record

Screen Elements

Preschedule step screen elements are listed below.

Field

Usage

Field

Usage

Proportion Remaining

The percentage remaining in every sum field for the selected activity

Remaining

The quantity of the field selected in the Display Field dropdown list after preschedule has been applied

Total

The quantity of the field selected in the Display Field dropdown list before preschedule has been applied

Delays (days)

The number of days before the selected activity can proceed on a record.

Example: At the beginning of the plan, a blast may be halfway through pattern prep. A delay can be used to represent the remaining duration of the prep time, preventing the blast from being drilled straight away.

Legend

See the Colors Legend in the bottom left-hand corner of the Preschedule step, which helps understand the meaning of the text colors.

Preschedule data Legend

Prescheduling

See different options of prescheduling below.

Single Record Preschedule

  1. Select an activity from the Activity list.

  2. Expand the record tree to the blast or dig solid.

  3. Set the proportion (or volume) remaining.

  4. Manual Values will be displayed Bold Orange (as per Legend in the Activity panel).

Bulk Preschedule

  1. Select an activity from the Activity list.

  2. Expand the record tree to a given level.

  3. Right click > “Set Values to …” option > (amount remaining).

Preschedule options

Use the dropdown menu available through the right mouse click to:

  1. Set all values for the selected record to 1.

  2. Set all values for the selected record to 0.

  3. Set all values for the selected record to the proportion specified.

  4. Clear Proportion Values set manually.

  5. Clear Proportion Values set automatically.

  6. Clear Values set for Delays.

 

Graphical Preschedule

  1. Click Edit Graphically button.

  2. In the Reserves Shading field dropdown select “<Proportion Remaining (Activity)>” option.

  3. Select one or more blocks for prescheduling.

  4. Right click > “Specify Remaining Value for Selected Blocks” option > enter new value in a dialog > OK.

Automatic Preschedule from Surface

  1. Press Use Surface button.

  2. In the Preschedule with Surface dialog choose Surface to use for prescheduling, min/max Thresholds, Records to check and Activities to preschedule .

Clearing Preschedule Data

To clear all manual or automatic prescheduled data, right-click on an activity in the Activity panel and select “Clear Preschedule Data for <Activity>”. All the Preschedule data will be removed and records color return to standard.

Notes

Blocks set for mining as 0 remaining, will appear in graphics with 0 tonnes and 0 bcm. To remove completely use the Record Removal step.

Prescheduling does not recognise where material is spatially, just that a % of the block has been mined and the inventory of all parcels is reduced by that %. It is recommended that mining prescheduling with a depletion surface is done in Rapid Reserver which will remove material from the correct location spatially.

Error Messages

Note that each block must have values for Volume, Dry Tonnes and Wet Tonnes (or 0 for all of them), otherwise you will get an error message as below and won’t be able to proceed with your project setup.

“Block/parcel (<Reserves/…….>) must have values for volume, dry tonnes, and wet tonnes, or 0 in each.”

  • Double click on the error message to display the whole list of affected blocks/parcels.

Review the preschedule data, you may find that some blocks have volume but no tonnes, or vice versa.

  1. Check the blocks affected in Rapid Reserver:

    1. Navigate to Rapid Reserver > Designer tab > select the block from APS Preschedule error message description > check its tonnes and volume in the Reserves tab at the bottom of the screen > most likely you will see the same missing values.

    2. Some blocks can be outside of the Block Model coverage > make sure you are using Block Model Gap Filling function, where default densities (this is essential) and tonnes are assigned (enable “Fill Block Model Gaps' in the Settings step).

    3. If Block Model Gap Filling is used correctly, but the error message in APS Preschedule persists, check your Reserves mappings in the Block Model step > Reservable Model Generator.

      1. Change the volume and tonnes expressions to exclude blocks with Zero density, ie:

        1. volume = N("density") > 0 ? N("size (X)")*N("size(Y)")*N("size(Z)") : 0, or N("size (X)")*N("size(Y)")*N("size(Z)");

        2. tonnes = N("density") > 0 ? N("size (X)")*N("size(Y)")*N("size(Z)")*N("density") : 0, or N("density") > 0 ? N("size (X)")*N("size(Y)")*N("size(Z)")*N("density") : N("size (X)")*N("size(Y)")*N("size(Z)")*2.5 (density).

      2. Regenerate your Reserves Model and review the changes.

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