“…The kaolin mining at PCKBD began in 1996 with the following companies: Sumitomo Some authors consider that the Capim kaolin is typically of sedimentary origin (Krebs and Arantes, 1973;Monteiro, 1977;Coura et al, 1986;Santos and Rossetti, 2003;Rossetti and Santos, 2006;Wilson et al, 2006;Murray et al, 2007;Góes et al, 2007), while others point to weathering originating from Miocene Barreiras sediments (Hurst and Bosio, 1975;Murray and Partridge, 1981), or from cretaceous sediments of Itapecuru or Ipixuna formations (Costa, 1991;Costa and Moraes, 1992;Moraes, 1994;Moraes et al, 1994;Costa, 1997;Kotschoubey et al, 1996;Costa and Moraes, 1998;Sousa et al, 1999a,b;Kotschoubey et al, 1999;Sousa, 2000;Sousa et al, 2007b). Santos et al (2007) conducted d 18 O and d D analyzes on kaolinites originating from soft and hard (semi-flint) kaolin from Rio Capim deposits and concluded that kaolinites were not in equilibrium with modern weathering processes.…”