Blending using Advanced Constraints

Introduction

A Global Mass Target Objective Function allows a single target to be controlled by Bounds or either Maximized or Minimized, in order to find an improved solution when blending. In addition, Throughput and Recovery settings are available as options for Normal Destinations. The latter are used when blending to alter the processing speed (throughput) and grade produced (recovery) for ‘Normal’ destination types within Studio OP, such as Plants, Crushers and Leach Pads.

Defining a Global Mass Target's Maximize Objective Function and associated Throughput/Recovery Settings

The general procedure for doing this is as follows.

In the Define Process Flows dialog, define a new process flow e.g. 'FULL' and add the relevant process activities in their correct order e.g. drilling, blasting then loading.
In the Destinations dialog, select a Normal destination type, click Edit.
In the Destination: <Destination Name> dialog, General tab, Processing Capacity group,
Set the capacity to e.g. Meet Exactly 750 Tonnes per 1 Hour(s).
In the Throughput/Recovery tab, tick the Throughput Settings check box.
In the By Column dropdown, select a 'tonnes per hour' data column e.g. [TPH].
Check that the Rate is by default set to 'Tonnes per 1 Hour(s)'.
Tick the Recovery Settings check box.
In an Element row e.g. AU, select the corresponding mineral processing recovery data column e.g. [AUREC], click OK.
Back in the n the Destinations dialog, click OK.
In the Constraints Targets dialog, add a new Global Mass Target e.g. 'Plant AU' and define the associated Target Details and Target Bounds parameters.

Back in the Global Mass Targets group, select the new global mass target variable, set it's Obj. Function value to [Maximize].

Note how the Target Bounds grid is disabled as it is no longer relevant.

Blending using Objective Function and Throughput/Recovery Settings

Define or modify the required settings as shown in the above section.
In the Design window, select the required block outline(s).
In the Reserves control bar, check that the listed BENCH number column only contains values corresponding to the selected block outline(s).
In the Studio OP Control toolbar, select the required period number.
Click Schedule Selected Blocks.
In the Schedule Activities dialog, select the Activity [Loading] (i.e. blending), select the Action [Schedule].
Select the Blend until reserve finished check box.
Click Blend to run the blender against the defined objective function, throughput and recovery parameters.
In the Blending Results dialog, check the listed results, click OK.
In the Schedule Activities dialog, click Done.
In the Studio OP Task Pane - Review panel, click New Graph.
In the New Graph dialog, select the Target field e.g. [Global:Plant AU], click OK.
Review the displayed graph, close the dialog.
Repeat steps 1 to 13 until the desired result is obtained, where necessary, using Undo Mining before proceeding.

	Related Topics
	Define Process Flows Destinations Targets