This paper investigates the geotechnical behavior of uranium mill tailings from Saskatchewan, Canada.The 4% tailings were well-graded with 29% fines whereas the 5% and 6% tailings were gap-graded with 49% fines. All samples exhibited a negligible strength(0.4 k Pa) up to 60% solids, followed by a rapid increase. The 4% tailings exhibited a lower rate and amount of settlement than 5% and 6% tailings. The kidecreased from 10~(-2)to 10~(-4)m/s with a decrease in eifrom 16 to 4 and a decrease in ef from 8 to 4 such that 4% tailings showed one order of magnitude lower values than the 5% and 6%tailings. The settling potential decreased ten times(50%–5%) for 4% tailings and four times(60%–15%)for 5% and 6% tailings. The effective stress increased from 80 to 260 Pa in the settling tests. The 4%tailings were less prone to segregation when compared with 5% and 6% tailings. The average solids content after settling was 35% for 4% tailings, 40% for 5% tailings and 39% for 6% tailings with a solids content deviation of ±3%, ±8%, ±6%, respectively. All materials were essentially non-segregating at 40%initial solids. This paper investigates the geotechnical behavior of uranium mill tailings from Saskatchewan, Canada. 4% tailings were well-graded with 29% fines whereas 5% and 6% tailings were gap-graded with 49% fines. All samples exhibited a negligible strength The 4% tailings exhibited a lower rate and amount of settlement than 5% and 6% tailings. The kidecreased from 10 ~ (-2) to 10 ~ (0.4 kPa) up to 60% solids, followed by a rapid increase. -4) m / s with a decrease in eifrom 16 to 4 and a decrease in ef from 8 to 4 such that 4% tailings showed one order of magnitude lower values ​​than the 5% and 6% tailings. The settling potential decreased ten times The effective stress increase from 80 to 260 Pa in the settling tests. The 4% tailings were less prone (5% to 5%) for 4% tailings and four times (60% -15%) for 5% and 6% to segregation when compared with 5% and 6% tailings. The average solids content after settling was 35% for 4% tailings, 40% for 5% tailings and 39% for 6% tailings with a so lids content deviation of ± 3%, ± 8%, ± 6%, respectively. All materials were essentially non-segregating at 40% initial solids.