Since the 80's, studies have shown that Au is mobile in supergene lateritic sur®cial conditions. They are based either on petrological, thermodynamic studies, or experimental works. In contrast, few studies have been done on the mobility of the Pt group elements (PGE). Moreover, at the present time, no study has addressed the di€erential mobility of Au, Ag and Pd from natural alloys in the supergene environment...