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Working Example

MiiNT allows you to group locations into Reconciliation Groups, so you can manage the inputs and outputs of like locations.

For example: All fingers of a ROM would belong to a group: ROM, all mine locations would be grouped by Pit-Bench.

The below example assumes the following:

• Survey perform pit survey at the bench level
• Survey only captures volumes of the ore stockpile, not dumps
• The weightometer on crusher is certified
• The remainder of document covers applying survey volume logic however the same process could be adopted to reconcile mass from crusher back to stockpiles

MiiNT presents Opening balance, inputs, outputs and closing balance for each recon group. You can adjust movements until each group balances:

• All the outputs from the Pit groups equal the inputs into the stockpiles.

• MiiNT displays the balance of each group based on the following:

  Opening +Inputs –Outputs=Closing

The numbers shown above are calculated volume, if the Balance has a large difference then the truck factors and densities used to calculate the movements should be reviewed and updated. If a group does not balance then it is up to user to question WHY the data does not add up and fix it.

Naturally ex-pit movements will never balance so to reconcile the pit you must enter the survey volume, this can be done at the Pit level or right down to the mine block level:

Any adjustment made to the Pit outputs will affect the inputs to relevant stockpiles:

The Stockpile inputs change when the output of Pit A is changed:

Aside from balancing data a reconciliation is a trigger to ensure data within the system is valid. It should drive users to question the data and ensure measures are put in place to improve the data.

In the below example some stockpiles have a change in balance but no movements, this means survey have said their volume has changed but no Load & haul data has been recorded:

This should not be seen as a bad thing in MiiNT as it is highlighting an issue with data collection and/or survey and should be rectified.

Stockpiles

Stockpile reconciliation is slightly more complicated than Pits because you need to ensure a stockpile balances as part of the reconciliation. Also:

• It assumes if survey values exist then those values have been entered prior to running the reconciliation.
• The opening balance of a stockpile is the Closing balance the day before the reconciliation; the closing balance is the balance on the last day of the reconciliation.
• The inputs and outputs are movements which occurred during the reconciliation dates.

Stockpile Rules

To balance stockpiles consistently the business must define Rules for balancing stockpiles. Rules such as:

• How should swell factor be handled when dealing with BCM input/outputs but LCM survey volume
  • Decide whether stockpile volume should be converted to BCM using an acceptable swell factor
• What are the known: Opening, Closing and Inputs
  • Can the inputs from the pit be adjusted?
  • Are only the outputs allowed to be adjusted?

Once the business has its rules for balancing stockpiles then you can balance the movements within MiiNT.

MiiNT allows you to adjust survey inputs and outputs.

NOTE: When adjusting survey inputs it will affect the survey pit outputs, so remember to ensure that the survey pit inputs are also modified to respect the stockpile input changes without affecting the actual survey volume.

For example if you had 100,000 removed from Pit A Bench 100, and the adjusted volume stated that 50,000 went to the Ore stockpile and 50,000 went to the dump. Looking at the dump you only had inputs and the change in volume based on the opening and closing balance was 40,000. You could change the input to the ore stockpile to be 60,000 and to the dump to be 40,000. Meaning 100,000 still came from the pit but instead of balancing as a 50:50 ration it was changed to 60:40 ratio.

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