Gold clusters in the Alta Floresta Gold Providence...https://www.researchgate.net/publication/299642595
If you can open the full report...
On the map ALTA has their projects on 4 of the 5 zones circled in this paper. Page 92 of the report...Pages 119-133...Look at the map too
A...Matupa/Firmino
B...Carlinda
C...Cajueiro
D...Apiacas
Thats just on the northern part of the belt