I assume that once the board has ok'd the BFS it will be released to the market.
Your comment - "A good BFS will surely drive short term SP growth, but really a project's NPV doesn't change because of short term concerns" sums it up very well. The ups and down of the market will affect the sp short term.
My understanding on the Super Tax is that it has zero effect on DML. In fact I think that DML will benefit from it, due to many resource sector investors looking outside of Australia.
Overall any movements in the sp short-term may provide an opportunity to add. Long term the story has not changed, if anything it is improving.
DML Price at posting:
67.4¢ Sentiment: LT Buy Disclosure: Held