Because Lead swings up doesn't make it a new ball game. The financiers would have to believe that Lead is going to have a sustained period where the price was above the DFS inputs. Keep in mind the time to build and the risks to getting into production. Takes time.
They won't be persuaded by natural price swings and in particular given the life of the mine is much shorter than they'd typically prefer. If management managed to drill successfully and extend the LOM substantially and prices enter a secular bull run that will last for a decade, then they'd be more inclined to lean in.
Those two questions alone need to be answered before there can be relative certainty those inputs can be confidently used in an investment thesis. At the moment they remain unanswered.
The above before talking about finance terms, which is likely to be high given the sticky inflation issues. Governments get rid of debt using inflation = higher interest rates.
(20min delay)