Yes, Brazil has a few really good places to find a all kinds of gemstones and gold nuggets. Not sure what you want to find yet, these areas seem interesting.
Sorry red, look for nuggets of gold or diamonds in this place there is a creek between the mountains not to see why this photo is far away, these places that you marked refer to that kind of material?
* Thank you for attention!
The red boxes must have some kind of gemstones. Then now I noticed there to be a river, it follows along just north or at the top right corners of each box. The orange boxes should be much better for gold nuggets.
Ok, checked again a little bit more, seems the 2 largest red boxes would be best for gem hunting, the 4 small boxes gold/gemstones, red circle possibly raw diamonds or most valuable type of gems.