In a fluviokarst region, three seldom used natural tracers, SiO ₂, Na and Ba, were considered for tracking the allogenic, silicate-derived water contribution to cave streams and to final karst outflows. The concerned allogenic recharge originates in watersheds that consist of metamorphic formations intruded by magmatic rocks, for which available whole rock chemistry data indicate rather uniform contents of SiO ₂ and Na, but contrasting (up to one order of magnitude) contents of Ba. All three considered natural tracers proved to behave, along karst flowpaths, conservatively, and indicated binary mixing between allogenic and autogenic inputs. However, only the dissolved Ba concentrations enabled chemical distinction to be made between two separate karst catchments: one having allogenic inputs presumably derived mainly from the weathering of Ba-rich rocks (essentially granites), while the other had allogenic recharge originating mostly in the weathering of Ba-poor formations. In contrast, if only the sampled waters SiO ₂ and Na concentrations had been considered, it would have been virtually impossible to establish if the two karst catchments were distinct - or not - from each other. When considering each of the two karst catchments separately, the concentrations distribution of each of the three natural tracers, SiO ₂, Na and Ba, consistently indicated that between a swallet and a connected cave stream, then further between cave streams and final karst outflows, the allogenic water relative contribution gradually diminished to the benefit of autogenic water. A two-component mixing model indicates that the allogenic water fraction in the major karst outflows remained, nevertheless, always important: about 70 - 80%, with a larger percentage being recorded during a low water stage.