here we go, page-15

actually

According to their quarterly they had just shy of $46m at the end of Sept

$46m is roughly how much their original 33% share of $140m of the SL Rail/Port refurbishment costs (disregarding the latest 200m+ estimate).

It would cost ~$21m to buy the whole 10% at an average of 0.45c

I'm not going to speculate on the MCC $80m but the fact is CFE doesn't have that $80m right now and therefore cannot spend an $80m they don't have.

The Mayoko sale still hasn't passed the red tape so effectively the $47m cash from that sale doesn't exist yet.

Whether they buy back a portion 'right now' would be highly dependant on when they actually had to pay the refurbishment costs. Otherwise you'll have to wait for the other sources of cash to kick in