This question was raised during the live session of GEOVIA CONNECT 25X: Rethink What’s Possible in Mine Planning and Design for Underground Mines. If you were unable to attend, the session is now available on demand at the link below.
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GEOVIA CONNECT 25X: Holistic Optimization for Open Pit to Underground Transition
Here's the response from @Nicolas SOTO, Services Software Expert Specialist - Dassault Systèmes:
 Nicolas SOTO
Services Software Expert Specialist
Dassault Systèmes | No, you don’t strictly need to. Many people assume they must have Whittle (or Pit Optimizer) plus the caving tools plus iSight to execute the workflow end-to-end, but that’s not required.
For the open-pit side, the workflow only needs:
1- A surface representing each tentative final pit (different pushbacks), and
2- A corresponding cash-flow profile, which can simply come from an external source such as an Excel file.
As long as you can provide those two inputs, the workflow can still be run; the open-pit production schedule itself does not have to be generated inside the optimization tool.
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