"His investigation was opposed by powerful mining interests, in particular the powerful Count of San Mateo Valaparaíso and his allies.Faced with the supporters of the Count in Zacatecas and among the "oidores" of the Audiencia of Guadalajara (as well as the support of one previous viceroy, Archbishop Juan Antonio de Vizarrón y Eguiarreta), Echávarri was unable to accomplish much.