OT-CoachRe: prior posts discussing IPT/GPR from you and mattb, and GPR's recent production report...congrats on your foresight being accurate...as was discussed in those exchanges, unforseen costs and delays incurred to remediate old workings are a fact of life in the short-term, but not necessarily a significant concern long-term.
No need to rehash that debate; but your astute analysis and cautionary foresight proved to be spot on, so I thought you deserved a little acknowledgement and credit!
Good lesson for helping to understand these companies.
Regards;