Constraints

Source file: epoch-setups-constraints.htm

Constraints allow you to guide or limit the schedules that Evolution can produce.

You can enter the screen that shows all constraints available for your setup after selecting Constraints > Overview from the setup configuration tabs. A short description is given for each constraint.

You can apply the required constraints by clicking (Add new constraint). The constraints applied to your setup will appear on the left side of your screen, as well as under the Constraints tab drop-down.

You can select a constraint to configure either by:

• Clicking on the required constraint in the Applied Constraints list.

  Or

• Selecting the required constraint from the Constraints tab drop-down.

The following buttons appear on all constraints to provide unified and simplified ways of operation:

	Enable or disable constraint Toggle button that allows you to enable or disable a constraint in your setup.
	Delete constraint Removes constraints from your setup.
	Edit constraint name Allows you to rename a constraint. Expand for information on renaming a constraint. To rename a constraint: Click the (Edit constraint name) button. The constraint name will become editable. Enter the desired constraint name and click . The new constraint name will be applied in the constraint main page and on the list of constraints applied in your setup. Note:  The default constraint name, which indicates the type of a constraint, will remain unchanged and will still be displayed in grey colour under the changed name on the Applied Constraints list.
	Overview Goes back to the Constraints Overview screen.

Constraints are classified as Hard and Soft, with the following distinctions:

• Hard constraints are mandatory for Evolution when it determines a schedule.

• Soft constraints are taken into account by Evolution when it determines a schedule, but meeting them is optional.

The following table provides a description of each constraint available in Evolution Epoch setups.

Constraint	Type	Description
Global Accumulation	Soft	Limits the maximum amount of material processed in a setup per reporting period.
Process Accumulation	Soft	Limits the maximum amount of material that can be sent to a mill per reporting period.
Region Accumulation	Soft	Limits the maximum amount of material that can be extracted from a region per reporting period.
Waste Area Accumulation	Hard	Limits the maximum amount of material that can be sent to each waste area per period.
Destination Rate	Hard	Limits the maximum rate at which material can be sent to each destination (mill, stockpile, and overflow stockpile) per period.