Grego, Bandera is in legal dispute over the ownership of Cinco Minas. The courts actions by not throwing out the case have given them legal standing.
Nowhere in any of the documents does it mention SRGE as the owner - SRGE is not listed on any of the concession titles.
As a shareholder of SRGE that should be your concern. The Mexican courts will adjudicate the case with the wisdom of Solomon.
As far as BGL being a fraud - your proof is that they claim they own Cinco Minas - like I said the Courts have ruled they have legal standing to dispute the concessions. Therefore they are not a fraud according to your premise.