Geological and mineralogical characterization of “San José” and “La Arenosa” veins, in Santa Marianita mine of Malvas parish, Zaruma district El Oro province. cna [Internet]. 2019 Dec. 20 [cited 2025 Dec. 5];13(2). Available from: https://revistas.ug.edu.ec/index.php/cna/article/view/1556