Define Destination Parameters

To access this screen:

  • Display the Haulage Destinations screen and next to From pit to the entry point and within, click Edit.

Choose the haulage settings associated with each rock type for a given destination. In essence, this defines the constraints of the destination with regards to how and when material is accepted to the destination and how travel is performed between the exit bench, pit exit and haulage destination. You also use this screen to define if and how travel is undertaken within the destination itself (for example, it may increase over time due to increased distance or decreased haulage capability.

Note: The screen title includes the target destination name in place of "Destination", for example, "Define MILL Parameters".

To define haulage and other parameters for a destination:

  1. Display the Define Destination Parameters screen.

  2. Review the Available rock type(s) and Accepted rock type(s) (material types deliverable to this destination). These rock types were defined during economic model import.

  3. Define the Storage Limitations for the destination.

    Note: Storage capacity refers to accumulated tonnage over the mine life.

    • Unlimited storage capacity: – Select [Unlimited storage capacity] for destinations such as crusher or mill.

    • Storage capacity limited to – Select [Storage capacity limited to] for destinations such as waste dumps or leach pads.

    • Accepts material after period – Enter 0 if the material is accepted from the first period, otherwise the material will only be accepted after the selected period (ex. if period 4 is selected, material will only be accepted from period 5 and on)

      Note: The scheduler needs the time to be defined prior to optimization but time depends on schedule resulting from optimization. Therefore, there will be differences between trucks hours per period desired and resulting from scheduling.

  4. Define the Exit Bench and travel between Pit Exit and Haulage Destination settings.

    • For Multimine MAO only Select a mine name – Not used in Studio NPVS+.

    • Exit bench – The bench at which the trucks exit the pit on the way to this destination. The bench count starts at zero at the top of the block model and increases downward. You can enter the bench directly or double click on an elevation in the Bench elevation reference box.

    • Time from Pit to destination (min) – The average time trucks travel from pit exit to destination entry. EFH distance from pit to destination (min) is calculated automatically and displayed below.

    • Time from destination to Pit – The average time trucks travel from destination entry to pit exit. EFH distance is also calculated automatically.

  5. Under Set parameters by pushback and bench, click Open Spreadsheet if you need to set up pushback and/or bench-specific haulage destination parameters. Displays the Define Haulage Destination Parameters screen.

  6. Configure Travel within Haulage Destination:

    • No travel within Haulage Destination is selected when trucks do not travel additional distance when delivering new material to destinations such as crushers.

    • Travel within Haulage Destination increases in time is selected when trucks travel additional distance when delivering new material to destinations such as waste dumps progressing away from the pit.

    • Travel within Haulage Destination decreases in time is selected when trucks travel reduced distance when delivering new material to destinations such as waste dumps progressing towards the pit.

      The calculation assumes the additional distance traveled within a destination is proportional to the additional amount of material delivered to the destination by a coefficient called Haulage Factor (HF). In other words:

      Add Distance = Add Material * HF

      • You can Calculate Haulage Factor from example data. HF can be defined using example data or directly. Assuming the truck travels an extra 1.2 min from destination entry to dumping location and extra 1.1 min from dumping location to destination entry for placing additional 2,500,000t on the destination. If the Reference speed is set to 30km/h the HF is calculated as:

        That means haulage trucks will travel additional 0.46 m for placing additional 1000t on the destination.

      • Alternatively, HF can be also entered directly as meters per 1000t (Enter Haulage Factor directly (m/1000tonnes))

  7. Click OK.

  8. Define other Scheduler settings and calculate a new schedule.

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