We operate three quarries in the mountain range that separates the towns of Markina-Xemein and Aulesti. These three quarries extract the vast majority of the marble known as "Negro Markina," as well as its gray varieties. The two main quarries (LEKOITZ and JAIME) account for more than 50% of the total existing production of Negro Markina.
In the small UGARTETXEA quarry, a very distinctive Negro Markina is extracted, which is highly recognizable in the international market for its characteristic lively white veining and unique combinations.