* Yanira Pizarro, who is currently working as the Supervisor of Third-Party Ore Purchases, is responsible for the evaluation and purchasing of external ore (both oxides and sulfides). She is also in charge of the Quality Management System for the Tres Valles project, which is up to the ISO 9001 standard.
* Her mining career has been based in companies such as Codelco, the El Salvador division, and the Los Pelambres mine. She has been working at Minera Tres Valles since 2009.
* Civil Engineer from the Universidad Técnica Federico Santa María in Valparaíso, Chile with a minor in Integrated Management Systems (emphasis in auditing).