I think they would get the maximum profit from their investment...

I think they would get the maximum profit from their investment in MBN if they re-list, and as @ccdavid has pointed out they already waited for 1+ year (what is another 1-1.5 year and I doubt they need the money) then wait until PoN is at $7.5US/lb and COP including royalty is $4.5US/lb and get 2-4X their initial investment selling the shares to the market in at most another 2 years, and don't forget they are likely to also receive the $11M USD VAT refund from the state government which is peanuts to them but it's MBN's money in the first place and it will help cover the re-start cost.

The P/E ratio is actually much lower than I initially calculated as I used the $1+ AUD (i.e. market capital of 920M+ AUD), it's actually 112/920=.12 USD so .75/.12= 6.25 and not 1/.12= 8.3, both are extremely low given most blue chip stock have a P/E ratio of 10-30 (another advantage of waiting.....)