WRD's and TSF's will remain on the mine site long after mining has ceased.  The structures will be stabilised as part of the closure plan, however there will remain a risk, albeit a reduced risk, of structural failure forever (as long as the structures remain).  The mining operator will be required to demonstrate the long-term structural stability of key infrastructure.  The risk profile will be site specific.

The frequency for assessment will be dependent on the risk profile.  In most instances the risk post closure will be reduced because the facility will be more stabilised and less dynamic (as material is no longer being placed) and therefore a reduction in monitoring frequency is expected to be justifiable.