(a) Tectono-metamorphic map of the Central Iberian Zone displaying spatial relationship between Sn-W occurrences and Variscan granitoids. CZ: Cantabrian Zone; WALZ: West Asturian-Leonese Zone; GTMZ: Galicia Tràs-os-Montes Zone; CIZ: Central Iberian Zone; OMZ: Ossa-Morena Zone and SPZ: South Portuguese Zone (Julivert et al., 1972). (b) Geological map of the Panasqueira district showing the lateral extent of the non-outcropping granite intrusion and the mineralized vein system (modified from Launay, 2019). Projected lat./lon. coordinates, ETRS89 TM6.