Figure 1: Map of geographical position of the study sites in the Urucum Massif, Corumbá, Mato Grosso do Sul, Brazil.

1. Rampa Nova, 2. Mina 5, 3. PRAD 45 C, 4. Piscinão 5. Mina Cateto, 6. PRAD 45 A, 7. Mina Escarpa, 8. Secção 10I, 9. Mina 5 N, 10. PRAD 45B, 11. Reference A, 12. Reference B, and 13. Reference C.