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Copper-mine tailings contain considerable amounts of copper (Cu) that may be extracted biologically or by organic ligands and may then become available to plants. A laboratory incubation experiment was conducted to assess the effect of a commercial garden growth substratum (GGS) containing natural mycorrhizae (Glomus intraradices) and peat moss in combination with lemon peel waste (LPW) on the evolution of labile Cu pool with time in a slightly alkaline Cu-mine tailing containing calcite. There were eight treatments combining four rates (0, 12.4, 50 and 100 g GGS kg -1 tailings) and two rates (0 and 100 g LPW kg -1 tailings). The amendments were thoroughly mixed with air-dry tailings in plastic bags. Distilled water was added to maintain the substrate at field capacity throughout the 8-week incubation period. The amounts of labile Cu in tailings increased with incubation time. Extractable Cu fractions as labile Cu (DTPA, Mehlich-3) were significantly increased after adding GSS and LPW. The smallest amount of labile Cu was found in the unamended tailings and the highest amount in the GGS-amended tailings.

Solubility and Lability of Copper in a Copper-Mine Tailings Treated with Two Organic Amendments