The partial and the integral enthalpies of mixing of liquid Au-In-Sn-Zn quaternary alloys have been measured at 500 degrees C along five ternary sections: In0.800Sn0.100Zn0.100, In0.550Sn0.225Zn0.225, In0.100Sn0.800Zn0.100, In0.450Sn0.450Zn0.100, and In0.225Sn0.550Zn0.225. In addition, using Kohler, Muggianu and Toop geometric models, the enthalpies of mixing were calculated and compared to the experimental one. (C) 2013 Elsevier B.V. All rights reserved.