Abstract: This study used metakaolin as the primary binder and copper tailings as a replacement aggregate to prepare geopolymer concrete specimens, incorporating different moduli of alkali activators (NaOH and sodium silicate) and predesigned mix proportions. Performance tests were conducted to evaluate the mechanical and workability properties, including splitting tensile strength, flexural strength, and setting time. The effects of four additives-RJF, KZ, XPJ, and HHY-were also investigated. Results showed that the optimal mix significantly improved tensile strength and shortened setting time. RJF and KZ enhanced strength and mixture stability, while XPJ and HHY slightly reduced strength but notably improved surface finish. This research provides a reference for the resource utilization of tailings and the practical application of geopolymer concrete.