The Sepon mineral district stratigraphy comprises Devonian to Carboniferous-aged continental fluvial and shallow-to-deep marine sediments, deposited in a half-graben basin. The sedimentary package has been divided into nine lithology based formations. The dominant fault directions are north-west parallel to the Truongson fault system and east-west parallel to the basin-bounding faults. The copper mineralisation covers a variety of primary and secondary styles. Along the contacts of the intrusive stocks, copper skarns are developed, while outbound of the skarnfront, lower temperature silica-sulphide replacement of carbonate rocks is common. Weathering and mobilisation of the primary mineralisation has given rise to a number of secondary ore types. The Khanong copper deposit is a near-surface high-grade supergene-derived chalcocite and oxide copper resource derived from the weathering of a replacement style, semimassivesulphide body, hosted by shallow dipping, highly sheared carbonated rocks.