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In this study, surface soils of the Bama Pb-Zn mine-impacted area were sampled for an area surrounding the mineral processing plant. After collecting 65 samples and analyzing them for initial Cu, Pb, Zn, and Cd metal contents, the area was zonated based on the concentration distribution using ordinary kriging in R. A single homogenous sample was prepared by mixing equal weights of each sample as being representative of the whole impacted area (S_T). Next, a synthetic model soil (S_M) was prepared according to the mean S_T texture (S_M), divided into two portions, where one portion was amended with a biochar composite (10% w/w) (S_MA), both portions were artificially contaminated with Cu, Pb, Zn, and Cd (S_MAC and S_MC). The mixed soil S_T, and the model soils S_MC and S_MAC, were subjected to soil sequential extraction procedure to determine the variations in fractionation of heavy metals …