Resumen: The main goal in this work is the study of Serrana Segunda ore deposit. In order to achieve this purpose, a petrographic study (with optical and electronic microscope) of rock samples collected in the mine, chemical analysis using dispersive X-ray energy and a bibliographic search of the geological context have been done Serrana Segunda is located in the Cameros Massif, an ancient Mesozoic basin created during an extensive period of rupture. The host rocks, Titonian in age, were deposited during an active early rifting stage and are mainly formed by fluvial and lacustrine sediments. This rifting stage generated a stress forces with normal faults systems and high subsidence rates with a thicker sedimentary infill (more than 6,500 meters). Later, with the Alpine orogeny, faults were reactivated as thrusts and folded structures. The very low- to low grade metamorphism that suffered the region was caused by thermal subsidence and the creation of two different hydrothermal systems, which resulted in the circulation of high-temperature fluids from lower levels through fault planes, fractures and permeable rocks. The host rocks are a mix of subarkose and feldspathic wacke with significant amounts of organic matter and high porosity that allows the circulation of fluids. Ore minerals occur as cements and replacements. Sedimentary-diagenetic fine-grained bornite, anilite and chalcocite were overprinted by a late hydrothermal mineralization made up of chalcopyrite and tennantite as the predominant mineralogy, along with minor arsenopyrite, galena and cobaltite-gerdorsffite. As products of a supergenic alteration azurite, malachite, thyrolite, chenevixite and stromeyerite were precipitated. Copper sulfides have crystallized replacing plant fragments or in areas with a high accumulation of organic matter. The mineralization occurs as stratabound to stratiform disseminations and is related with significant accumulations of organic matter along bedding, which served as an in situ reductant that would cause the precipitation of copper from an oxidized sedimentary brine. The key attributes of Serrana Segunda ore deposit allow us classified it as a Redbed-hosted copper model.