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Fig. 3. X-ray diffractograms showing the minerals present in Core 1 (6.4–8.2 m) from a reduced zone at the up-gradient interface to a highly cemented oxidized zone at the down-gradient interface collected 30 mo after operation. Ak, akaganeite; Ar, aragonite; C, calcite; Ca Fd, calcium feldspar; Fe, zerovalent iron; IHC, iron hydroxy carbonate; G, goethite; L, lepidocrocite; Mg, maghemite and/or magnetite; Mk, mackinawite; Q, quartz; and S, siderite.