1. Angélica, R.S., 1996. Mineralogy and geochemistry of gold-bearing gossans and laterites from Igarapé Bahia and Águas Claras in Carajás, Eastern Amazon, Brazil. Unpubl PhD thesis, Federal University of Pará, Belém, Brazil, 116 pp. (in Portuguese).
2. Gold, wolframite, tourmaline-bearing lateritized gossans in the Amazon region, Brazil;Angélica;J. Geochem. Explor.,1996
3. Araújo, A.S., 1995. Multi-element geochemistry of lateritic crusts and soils from Eastern Amazon region, Brazil. Unpubl. PhD thesis, Federal University of Pará, Belém, Brazil, 241 pp. (in Portuguese).
4. Mechanism of gold transfer and deposition in a supergene environment;Benedetti;Geochim. Cosmochim. Acta,1991
5. The mobility of gold in tropical rain forest soils;Bowell;Econ. Geol.,1993