From the geochemical evidences, the hydrothermal precipitation is excluded due to the relatively low metal content of the studied ironstone in Cu, Pb, and Zn (Gloaguen et al., 2007). The lack of significant correlation of Fe with As, Cu, and Zn elements (Tables 3–5) may also exclude the hydrothermal influences (Lottermoser and Ashley, 1996; Ashley et al., 1998).