The four distinct gabbroic rock types identified within the Raglan Hills metagabbro were derived from a heterogeneous metasomatized depleted mantle, were produced under variable melting conditions, and the intrusion was emplaced into supracrustal calcitic metacarbonate rocks at roughly 1229 Ma. The intrusion was later deformed and metamorphosed during the Shawinigan and Ottawan orogenic events. Sparse magmatic Ni-Cu sulphide occurrences were hydrothermally altered during metamorphism and locally upgraded in structurally controlled veins.