Above the industrial scene on the north wall, Rivera has placed another scene of indigenous work, this time two indigenous figures holding minerals mined from the earth. Behind them, a mountain rises up from the background out of which a number of hands protrude, also holding minerals from the earth. Together with agriculture, mining forms the second foundational pillar of the industrial process. That both of these pieces are represented by indigenous figures and motifs forms quite a striking contrast to the hyper-modernity of industrial life.
Questions of the relationship between earth and industry, between indigenous work and industrial work, and between traditions and modernity pervade the murals. The coexistence of indigenous and industrial cultures seems at first glance harmonious. The realities, however, of the status of indigenous agricultural societies were far from utopian. However much modern industrial society might have been rooted in (even dependent on) traditional practices and identities, the ruptures between "modern" and "traditional" life were profound. The period in world history between 1914 and 1945 is defined by this complex relationship.