Energy of activation (E a ) and specific heat capacity (C p ) for mixtures of sulphide minerals that on their own do not self-heat (SH), sphalerite/pyrite, pyrite/galena, chalcopyrite/galena and sphalerite/galena, were determined using a self-heating apparatus at temperatures below 100°C in the presence of moisture. The mixtures all gave E a ranging from 22.0 to 27.8kJmol −1 , similar to the range reported for Ni- and Cu-concentrates. The E a is close to that for partial oxidation of H 2 S which adds to the contention that the partial oxidation of H 2 S contributes to SH of sulphides at low temperature. The C p values ranged from 0.152 to 1.071JK −1 g −1 as temperature rose from 50°C to 80°C, similar to the reported findings on Ni- and Cu-concentrates. The role of galvanic interaction in promoting SH is tested by examining correlations with the rest potential difference of the sulphides in the mixture.