Abstract:For the complex situation of geological conditions in Laixi Gold Mine, the security situation is serious if using the existing mining method, so there is a research on the classified tailings backfill technology. Backfill can limit the surface subsidence and achieve the mode of no-waste-discharged at the same time. It can improve ore recovery and reduce ore dilution. This experiment used classified tailings in Laixi Gold Mine as the aggregate and material C as the cementing. The test was made for three factors which is influencing the strength of filling, such as slurry concentration, cement sand ratio and age. According to the uniaxial compressive strength test block data, the result reveals that these three factors and the filling body strength were positively correlated. Based on the compressive strength of the filling, a suitable filling mixing proportion for Laixi Gold Mine is determined, and the result can provide useful basis for the parameters selection of mining and filling processes.