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Iron XANES. A) IKMHSS normalized XANES from the shallow pit (0–55 cm) and deeper core (to 180cm) from mine tailings (fits calculated from first-derivative fits shown in dashed lines), B) IKMHSS first derivative sample spectra (fits shown in dashed lines), and C) Fe first-derivative XANES of reference minerals used in XANES linear combination fits. The Fe XANES show a gradual transition from ferric oxide to ferrous sulfide phases from the surface to deep tailings.
