The Santa Eulália Plutonic Complex is a large granitoid ring-complex exhibiting several granite facies, gabbro-diorite rocks and roof pendants from the country rocks. This lithologic variability crossed with the spatial distribution of each lithotype within the complex enables the grouping of the different magmatic rocks in: G0 group (“pink-reddish” granites in an external belt), G1 group ("greyish” granites in the inner part”) and M group (gabbro and diorite as enclaves in the eastern regions of the G0 group). All these groups host facies of interest for dimension stones due to their aesthetic value and, therefore, a systematic thematic mapping has been conducted and refined throughout the years. In this work we verify the applicability of Sentinel-2 multispectral images combined with Random Forest as a classification methodology to distinguish the different gran-itoid groups and support large-scale lithological mapping. The results show overall accurate outline of the facies, with areas corresponding to the G0 group displaying good predictions, areas representing the G1 group moderately good predictions, and areas established for the M group poor predictions, obtaining Producer’s accuracies of ~82%, ~60%, and ~30%, respectively.