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Pseudoflow
Pit Optimization Algorithm
v5.0
Pit Optimization
Pit Optimization was introduced to Deswik.CAD in
v4.2
- Function is present in Tools|Geological Models|Datamine Commands
- Accessed through the Advanced Open Pit Metals licensed functionality
Up until V5.0 has worked upon the Lerchs-Grossman
algorithm
What’s new in v5.0?
Change in algorithm used from
Lerchs-Grossman to
Pseudoflow
What’s Pseudoflow?
Alternative pit optimization algorithm – simply
faster
Provides the same resultant pit shells as Lerchs-
Grossman
Is more efficient at removing “redundant” options
and therefore reduces processing requirements
How much faster?
Lerchs-
Grossman
Pseudoflow
Variations – “Hill of Value”
Additional speed of the Pseudoflow algorithm
allows for many more iterations to be run
Allows for the generation of many options and
determination of what the key drivers are for
ultimate pit shell size
Variations - Iterations
Here we set the number of iterations to run.
Variations – X and Y Variables
Here we set the value for the X Column (in this case it
Is a random number based on a triangular distribution)
Here we set the value for the Y Column (in this case it
is a random number based on a normal distribution)
Variations - Formulae
Here you can see the
dilution is multiplied
by the X Value
Formulae edited by clicking in here
Variations – Formulae Continued
Here you can see the mining cost is multiplied by the Y Value
Variations – Results
All of the 100 iterations ultimate pit
results are written to this excel file.
Variations – Results Contd.
Multiple runs can be added here.
So you can understand sensitivities.
Results – Results Contd.
Graphic Results – Results Contd.
Deswik Software Suite v5.0: Pseudoflow pit optimization algorithm
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Deswik Software Suite v5.0: Pseudoflow pit optimization algorithm