In this work C-12 induced reaction on Gold( 197Au) in the energy range of 59Mev to 91Mevrnhave been studied. Excitation function for four reactions of the type 197Au(12C; 3n)206At,rn197Au(12C; 4n)205At, 197Au(12C; 5n)204At and 197Au(12C; 6n)203At were studied in thesernreactions. For theoretical excitation function the computer code COMPLET have beenrnused. The theoretical results are compared with the experimental excitation functionsrnobtained from EXFOR data source,IAEA to verify signatures of pre-equilibrium decay.Thernstudy shows that at intermediate energy, carbon induced reactions on high weight nucleirnoccurs through pre-equilibrium and equilibrium(compound) nucleus stages and not onlyrnby compound nucleus formation