In reply to Yesteeler:
Very tough enterprise indeed my friend! I don't think you will find anything in that area, but I might be even wrong.
There probably is some potential around "Chapada dos Guimaraes" but it's just a guess to tell you the true...I would say, if it is really important for you take all your gear and be ready for opening new routes on virgin terrain (probably crappy rock).
Please let e know if you find anything! 80)