Introduction -- Geological setting -- The Santa Olalla Igneous Complex -- The Aguablanca Ni-Cu-(PGE) sulphide deposit -- Stable and radiogenic isotope studies -- Ore-forming processes -- Conclusions.This book describes the Aguablanca Ni-Cu-PGE sulfide deposit, the first, and to date only, mineralization of this type in southwestern (SW) Europe. Since its discovery in 1993, this ore deposit has attracted the attention of the resource geology community due to its unusual geodynamic context, namely an active plate margin. The book focuses on the key features of the deposit and reports on the ore-forming processes that were most important for its formation.