The mine tailings of a former gold mine in Nopiming Provincial Park, Central Manitoba, Canada, was observed to be highly degraded in soil structure as well as other chemical and biological characteristics. The tailings are highly acidic (pH 3.5), contaminated with copper (2000 mg kg−1), have very low organic matter (2.3 g C kg−1), and cannot be revegetated by native species. To reclaim the mine tailings, humic substances (HSs) and lime, with or without wheat straw, were incorporated in the tailings and then incubated up to 24 weeks. After incubation, a significant increase of macroaggregates, especially 2- to 20-mm aggregates, was observed in the HS-amended tailings corresponding to the length of incubation and doses of HS. Wheat straw initiated microbial activity in the mine tailings and also showed increase of the macroaggregation. Lime was less effective than HS in the formation of the macroaggregates. The amendments increased organic carbon (OC) in the mine tailings, which remained greater th...
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Ibrahim et al. (2004) studied this question.
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