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1. Introduction The Vale Group, through the Vale-RDC Company, operated in 2010-2012 surface and drilling explorations in the search licence PR-2348, in the northwestern portion of the Katanga Copperbelt (here after KCB), in the Democratic Republic of the Congo (here after "Congo") (Figs 1, 2). This permit, nearly 20 km north-northeast of Kolwezi, includes the poorly documented Five-Klippes area that displays Roan megabreccias and was expected to possibly contain economic copper and cobalt occurrences. Exploration for Cu-Co on that area provided new geological observations, especially on the structural setting of the megabreccias. Figure 1. Geological and tectonic map of the Lufilian Arc with its I to IV structural subdivisions, the Kundelungu Foreland and the Paleo-Mesoproterozoic basement (modified after Kampunzu & Cailteux, 1999). KCB = Katanga Copperbelt; ZCB = Zambia Copperbelt; MDZ = Mwembeshi Dislocation Zone. I = External fold and thrust belt; II = Domes region; III = Synclinorial belt; IV = Katanga high; Lub = Lubumbashi; Lik = Likasi; Kol = Kolwezi. Position of Fig. 2. The Neoproterozoic Katangan rocks were intensely folded during the pan-African Lufilian orogeny and formed large thrust nappes in the central and southern parts of the KCB (Francois, 1987, 2006). Contrastingly, the outcropping Nguba and Kundelungu rocks in the northwestern part are interpreted as autochthonous Katangan, the so-called "autochthonous massif" (Francois, 1973). It is overlain by the Kolwe

Geological observations in the Five-Klippes area, northwestern Katanga Copperbelt (Democratic Republic of the Congo)