Our DUQUESA-URKULU quarry exploits a specific limestone vein, oriented North-South, on which small artisanal operations have historically been located. This ornamental rock has been highly valued since ancient times for its strength and compactness and has traditionally been used throughout the region for both construction and the production of elements related to rural sports. Formally exploited since the 1930s, this quarry exclusively produces the well-known Gris Duquesa and Gris Deba marbles, as well as their pink and dark gray varieties.