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The electronic properties of single phase type-I clathrate compounds, Ba 8 Au 6 (Si or Ge) 40 and Ba 8 Ge 46Ϫx have been investigated. The crystal structure, electrical resistivities, magnetic susceptibilities, the density of states at the Fermi level, and the band gap ͑where applicable͒ were determined. Ba 8 Au 6 Si 40 and Ba 8 Au 6 Ge 40 show a metallic behavior whereas Ba 8 Ge 46Ϫx is semiconducting. On a basis of this work, a first evidence is presented of the existence of type-I mixed-clathrates containing both silicon and germanium.