Speccie your last paragraph pointed to the main reason I believe...

Speccie your last paragraph pointed to the main reason I believe management did this deal.
They aren't blind to the current problems with the company's structure. They are also being ribbed by long term holders about the share price.

The Paterson capital raisings have been bad for the company. Not only have they diluted the stock but more than that, they have introduced too many day traders to CAS at the expense of long term holders.

Management know three things:

NO more low priced capital raisings. They are eroding confidence in the stock. Secondly then, bring a financial parter into the company. And thirdly, bring long term holders back to CAS. Then the share price will sort itself out.

The financial failing of Posse has seen a different strategy by management. That they MUST bring in a financial parter in for Juruena and Borborema. Or more to the point, CAS has two good deposits but no cash. When Mike Young of BCI gave half of his project away to FMG for rail and port access, he said, "50% of something, is better than 100% of nothing". We were getting to the point that we had 100% of nothing without financial help.
Incidentally, BCI went from seventeen cents to five dollars fifty, as opposed to BCI's peers who were too proud to do a deal, their SP went no where.

A top deal for me, I'm very happy, I believe management deserve a pat on the back. It's a smart, well thought out deal. This should also change the sentiment of many. I'm also expecting some further news over the next few months now that we have this cash.
Sentiment changed to buy.