The analysis of archaeological objects requires simultaneously, non-destructive, fast, versatile, sensitive and multielemental methods. Our purpose was to help Romanian archaeologists to identify objects provenance (workshops, technologies, mines) and to explain commercial, military and political aspects. Ancient Greek silver and Dacian gold coins were studied. For silver coins, two methods were used : in air 3 MeV protons PIXE (Particle Induced X-ray Emission) at U-120 classical Cyclotron and Am-241 source based XRF (XRay Fluorescence). We obtained the coins composition and, comparing the quantities of Ag, Cu, Sn, Pb and Au, we found which are original, which are copies and which are Barbarian imitations. For gold coins, the methods used were XRF and PAA (Proton Activation Analysis). For PAA, each coin was irradiated in vacuum for 5 hrs at an incident proton energy of 11 MeV provided by a HVEC Tandem accelerator. Three groups of coins with different composition were found, corresponding to simple, complex and no monogram pieces.