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Overview
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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.
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Adding Product Specification
To add the optimisation rule, press the Add Product Specification button and select a type from the dropdown.
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2. Name the rule clearly.
Avoid using commas in the Product Specification rule name, otherwise you will get an error message preventing you from going past this step:
<The name of product specification (…), is invalid because it contains invalid characters>.
3. Toggle the Use Spec flag to enable or disable usage of the Product Specification rule.
4. Click the field in the Configuration column to customise the optimisation rule. Once completed, the configuration field will list all of the populated fields.
Product Specification types
Product Specifications are used to determine the best destination for material at each time step. The best destination is defined as the one yielding the highest positive cash flow, where the Cash Flow is the sum of all Rewards and Penalties.
Product Specification type | Usage |
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Cash Flow | Reward (or penalty) to send material to a destination. |
Blend Target | Penalty for failing to meet blend ratios. |
Grade Target | Penalty for failing for meet grade specs. |
Detailed description of each Product Specification type and their impact on the optimisation process see below.
Cash Flows
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Cash Flows allow the user to specify an incremental Reward or Penalty for each tonne/cubic meter/ounce of material sent to a Destination. Cash Flows help the user to have better control over the fleet allocation, prioritising more profitable movements. If two rules satisfy the same condition, then the cash flow is the sum of values in each rule. |
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Item | Description | Example | ||
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Specify Min | Limits minimum ratio of the material fed from the Source to the Destination.
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Specify Max | Limits maximum ratio of the material fed from the Source to the Destination. |   | ||
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Specify Target | Specifying target also introduces “Content Deviation Penalty” input row in the Calendar. The difference between the Actual and the Target blend is subject to this Penalty multiplier specified by the user. The Penalty is summed with the Cash Flows to determine the reward or cost of blending materials into each Destination. The higher the deviation penalty, the better the optimizer will try to meet the target, but it may not be achieved due to other cash flows and objectives. |   | ||
Show Tram Lines | Displaying additional guidance lines rows for the optimisation rule in the Calendar. Used for visual purposes only to change the color of values in the “Actuals” field, ie i.e. if it goes out of range by more than 0.0001 it goes red, less than orange, otherwise it's black. TBA |  | ||
Numerator and Denominator | Blend ratios are calculated using a Numerator and Denominator, as such the setup requires both to be populated.
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Destinations | The Destination(s) to which the blend target is applied. |  | ||
Quantity Field | The field to which the blend target is applied.
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Sources | The Source(s) for Numerator and Denominator to which the blend target is applied. | |||
View Database | Use the View Database button to open the Choose Records window, where you can graphically select and review the Sources. |  | ||
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Use the Cash Flows to prioritise hitting limits and targets over certain periods. |
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Grade Targets
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Grade targets allow the user to specify a strict grade range, and place penalty multipliers on deviation from the |
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Target. Different |
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Destinations may have different |
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Grade targets. |
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Grade Fields
Grade specifications can be set to reference any field in the database.
Type | Example Field | Application | Note |
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Insitu Fields | mining_grades_fe | Insitu Grade/Head Grade | Use these fields on Stockpiles and Crushers when targeting a head grade. |
Process Streams Fields | mining_ProcessStreams_dry_rail_SubProducts_fines_grades_fe | Fines product grade, through the "dry" plant, at the "rail" point | Use these fields to target product grades on Stockpiles. Since the software does not know what Crusher the Stockpile will feed into, the user is required to specify the Processing Stream of the quantity fields.  To configure the dry/wet, rail/ship, lump/fine process stream options, see Setup > Processing Paths. |
mining_ProcessStreams_dry_rail_grades_fe | Total (Lump + Fines) product grade, through the "dry" plant, at the "rail" point | ||
Output Fields | Output>rail_SubProducts_fines_grades_fe | Fines product grade, through the (wildcard) plant, at the "rail" point |
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Insitu Fields
Use these fields |
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Process Streams Fields
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to target product grades |
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Output Fields
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through Crushers. Since the software knows the |
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Processing Stream for each |
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Crusher, the “Output” fields act as a wildcard to automatically select the corresponding grade fields. |
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Grade Limits and Targets are explained in the table below.
Input | Description | Notes |
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Grade Lower Limit | The final weighted average grade cannot be below this value.
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Grade Limits applied to Product Specifications > StockpileGradeTarget are the weight average of the material added to the Stockpile over a Period. They are not equal to the grades of the stockpile closing balance. | ||
Grade Upper Limit | The final weighted average grade cannot be above this value.
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Grade Target | The difference between the | |
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Actual grade and the |
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Target grade is subject to a penalty multiplier specified by the user.
If Crusher A and Crusher B have different grade targets, then a single block will incur a different penalty depending on the destination. This penalty is summed with the Cash Flows to determine the reward or cost of blending materials into each destination. | ||
Content Deviation Penalties | The value of the content deviation penalty should be considered relative to other grades, and relative to the Cash Flow values.
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Notes
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