IOH 0.00% 70.0¢ iron ore holdings limited

In their latest investor presentation, the BS diagram shows an...

  1. 200 Posts.
    In their latest investor presentation, the BS diagram shows an outline of 77Mt above surface. Isn't this the dry tonnes they are indicating to truck and barge and if so, is the dam necessary to allow access to the area during the wet or stop a below surface pit from flooding?

    Could they begin the above surface operation then invest/build the dam when they want to start going below surface?
 
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