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Overview
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This step is hidden if the scheduling mode is set to Constrain to Truck in the Configuration Options step. |
When the user presses the button to run one period in the schedule, there are two passes happening behind the scenes.
In the first instance, each Agent selects a mining sequence determined by the dependencies, incentives, and constraints. No destinations are assigned.
In the second instance, an optimisation is run to determine the best destination for each ore parcel, using the Product Specifications as inputs.
The Product Specifications step allows the user to define the rules of the optimisation. Each rule becomes a new row in the Calendar; values for the rule are specified in Schedule > Calendar > Product Specifications.
Main components and functions of this step are described below.
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Cash Flows
Cash flows allow the user to specify an incremental reward or penalty for each (tonne/cube/ounce) of material sent to a destination. If two rules satisfy the same condition, then the cash flow is the sum of values in each rule.
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To enable movement between stockpiles:
Press Add Product Specification button and from its dropdown select "Stockpile Cash Flow".
Name it as "RehandleThreshold_setTo1000".
Set the units to "mining_volume".
Select the source and destination stockpile.
In the Calendar, set the cash flow to 1001.
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Be careful to only allow one-way passage of material between stockpiles. Do not incentivise the optimiser to engage in non-productive rehandle. |
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If the net grade penalty is greater than the crusher cash flow, then the crusher won't feed.
If the Fe grade penalty is greater than the Al grade penalty, then the optimiser may blow out Alumina to keep Iron on spec. This is because the penalty of dirtying Al is lower than the penalty of dirtying Fe.
Notes
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Note that setting goals and minimum varieties does not guarantee that they will be strictly adhered to. With multiple specifications in a project, the optimizer will try to achieve the greatest possible profit, which is made up of different specifications for varieties of different components, as well as cash flows. |
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