Within the Eastern Succession of the Australian Mount Isa Inlier, Monakoff is a 1 million tonne (mt) Mesoproterozoic, oxide Cu-Au deposit only 13 km from the large (167 mt) Ernest Henry mine. The two deposits share similar geochemical signatures (Ba-Cu-Au-U-Pb-Zn-As-Sb-Co-W-Mo-Mn-F-REE), suggesting commonality of origin. This signature is far more complex than those of most other Eastern Succession Cu-Au oxide systems, but it is extremely similar to the signatures of some recently discovered large Brazilian examples, such as Alemao. Monakoff ore has a barite-carbonate-fluorite-magnetite-chalcopyrite-dominated mineralogy, and contains economic quantities of Cu, Au, Co, U and Ag; the 1-2% levels of both Pb and Zn are unusually high for oxide Cu-Au deposits. However, it lacks the distinctive K-feldspar alteration halo of Ernest Henry. It occurs on the northern south-dipping limb of the Pumpkin Gully Syncline, considered to be a regional, EW-oriented, D2 fold, bounded to the north and west by Di thrust contacts. A splay of the northern thrust hosts the main Monakoff mineralisation. Naraku Batholith elements outcrop ~2 km north of Monakoff; and ore alteration records post-ore hornfels recrystallisation.