Kinetic leached columns (KLCs) were used to simulate the weathering of pyrrhotite-rich tailings from Raglan Mine (QC, Canada) and evaluate the effects of freeze-thaw cycles and salinity on long-term trends in sulfide oxidation. This study focuses on the results of a series of oxygen consumption tests (OCTs) with additional observations from the dismantlement of the KLCs. Four treatments were evaluated in duplicate in the KLCs: (1) room-temperature and deionized water; (2) room-temperature and saline water; (3) freeze-thaw cycles and deionized water; and (4) freeze-thaw cycles and saline water. Oxygen fluxes showed no reproducible differences over the course of the study when comparing between deionized and saline water columns within each thermal regime. However, fluxes may have differed slightly at several timepoints. The room-temperature and freeze-thaw columns displayed somewhat different oxidative behaviors. Notably, all columns stabilized at similar oxygen fluxes, though the amount of time until stability differed for the two thermal regimes. Visual observations made upon dismantlement of the columns revealed extensive oxidation and cementation throughout the entire depth of the columns with no significant differences noted between the room-temperature and freeze-thaw columns. This study provides novel insights into the long-term evolution of sulfide oxidation in mine tailings weathering under conditions relevant to northern mine sites.