Abstract
When sulphidic tailings are exposed to atmospheric conditions, oxygen can flow in the material where it will be consumed by oxidation reactions. This paper presents results from a project studying the in situ oxygen diffusion and consumption in tailings. It provides measured values for the oxygen reaction rate Kr and the effective diffusion De coefficients based on oxygen consumption and diffusion tests that are performed under various conditions. Based on the test results, the Kr and De values determined in situ are compared to values obtained through simple predictive models. Results indicate that the value of these two parameters is influenced by factors such as the degree of saturation Sr and in situ porosity n. A lower Sr or a higher n may increase the oxygen flux toward the reactive tailings, which can increase the production rate of acid mine drainage (AMD).
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