The high-grade ores at the Águas Claras Mine have at least a dual origin, involving hypogene and supergene processes. ..... Guild 1953;Park1959; Dorr 1964, 1965; Eichler 1968;. Cabral et al. 2003 ...... the Cauê Formation is 2,000 m thick due to folding. The ...... According to Bau and Dulski (1996), the combination of.