MAO-MFO Settings: Optimization

To access this dialog:

Using the Optimization control bar, select Allocation & Flow | Settings... and select the Optimization tab.

MFO requires only mining rate limits in addition to MAO parameters.

Field Details:

The following fields are located on the Optimization tab:

MAO: Optimize material allocation for Scheduler OES: select this option to run MAO.

MFO: Optimize mine flow for Scheduler OES: select this option to run MFO. When you select this option, the Set maximum mining rates... option becomes available (see below).

Set maximum mining rates...: you can set an upper limit on mining rate (total rock mass mined in a year). If the Maximum Rate is not defined MFO runs twice the Scheduler rate: optionally, you can vary the limit over time. The Mining Rates limits can include:

only material from the mine(s),
material from the mine(s) and reclaimed from stockpiles, or
material from the mine(s), reclaimed from stockpiles, and from external sources.

The lower limit on mining rate is the mining rate as defined by the Scheduler. MFO can only increase this rate.

FMS: Schedule Pushbacks and optimize material allocation: select this option to run FMS.

Select files: in this section, select one of three options:

NPVS Pushbacks starting at default Topography: this option instructs the scheduler to use the NPVS-generated pushbacks and is the default setting.
Other pit sequences and/or Topographies: after selecting this option click Define to open the Input Files for Flexible Material Scheduler dialog where you can select the input files.

The dialogs are different for single mine and multimine projects. For the latter, you select the files for each mine; you can also exclude any particular mine from scheduling.

In any period, FMS mines either nothing or the lesser of the user defined value and the whole pushback content.
Another MMS generated pit sequence (Multimine only):after selecting this option click Define to open the Input Files for Flexible Material Scheduler dialog where you can select NPVS-generated multimine input files other than the default topography and/or the pushback file.

Schedule until: the following schedule stop conditions can be set:

As long as solutions are found: FMS will continue the solution process until it fails to find a feasible solution (meaning schedule that satisfies all the targets).: this is the default setting.
Select period: FMS will continue until the indicated period unless it fails to find a solution at an earlier period.

Mining rate control: Unless you set minimum mining rate, FMS may come up with a zero solution (do nothing) at periods when the revenue is negative; for example, when there is no ore to mine before mining some waste.

Set minimum mining rate to: set a minimum tonnage for all periods using this option.
Set variable minimum and/or maximum rates: this option allows for changing the rates over time and for setting the maximum as well as minimum rates. After selecting this option click Define to open the Mining Rates Limits dialog where you can set the rates to either tonnage coming from the mine, from the mine and reclaimed from stockpiles or from the mine, external sources and reclaimed from stockpiles.

Adjust control parameters: click to display the Flexible Material Scheduler Control Parameters dialog. This is used to control several aspects of the MIP formulation and its resolution depending on the selected options.

Define constraints by pushback...: this button opens the Flexible Material Scheduler Pushback Control Parameters dialog.

	Related Topics
	MFO Essentials MFO Quick Start FMS Essentials FMS Quick Start FMS Pushback Control Parameters

JMN 20065_01_EN