Fixed Cut-Offs

Source file: strategy-setups-process-cutoffs.htm

The Fixed Cut-Offs tab is used to define the target cut-off grade per primary element per period. If values of zero are provided for every period, Evolution will perform cut-off grade optimisation. This means that the Evolution will choose the optimal cut-off grade for each period. Otherwise the provided values will be used.

The Force Process Ranking checkbox, when selected, forces the following to take place:

  1. Calculating the overall breakeven cut-off for all processes.

  2. Ordering the processes by their breakeven cut-off.

  3. Enforcing the rankings by Evolution.

To make it clear, let us go through a worked example. Suppose the Force Process Ranking checkbox is selected. Consider the following list of processes: Mill A, Mill B and Mill C. Evolution will now calculate the overall breakeven cut-off for each process. Suppose the values calculated are as follows:

  • Mill A — 0.8

  • Mill B — 0.65

  • Mill C — 0.4

Because the behaviour has been enforced by checking the checkbox, Evolution will ensure that Mill A will always have a cut-off greater than Mill B and Mill C, and Mill B will always have a cut-off greater than Mill C.