Abstract: In order to find out the influencing factors of pipeline transportation resistance of ultra�fine tailings filling slurry in a Carlin-type gold mine and solve the problem of slurry pipeline transporta⁃ tion，the orthogonal test of full tailings + waste rock + cement filling ratio is carried out. The yield stress and viscosity of filling slurry are tested. The pipeline transportation resistance under different slurry flow rates and pipeline inner diameters is studied，and the specifications of filling pipeline are optimized.The re⁃ sults show that the concentration of tailings slurry is positively correlated with the yield stress of filling slur⁃ ry，and the viscosity increases with the increase of concentration. The pipeline resistance increases with the increase of slurry flow rate and decreases with the increase of pipeline inner diameter.According to the variation law of pipeline resistance with the inner diameter of the pipeline and flow rate，it is concluded that when the high concentration filling slurry is transported，the most reasonable filling pipe specification is ϕ125 mm. It reveals the relationship between the rheological behavior of ultra-fine tailings high concen⁃ tration filling slurry in Carlin-type gold mine and the pipeline transportation resistance，which can provide a theoretical basis for the safe transportation of slurry and equipment selection.

Key words: filling slurry, yield stress, pipeline resistance, pipeline specification