Make sure to visit it. After lunch (which includes specialties from Minas Gerais, of course!), take a bus to Mina da Passagem, a mine which has high walls and, therefore, is accessible even for those who don't like tight spaces.
Después de comer (delicias mineiras, ¡por supuesto!), tome un ómnibus hasta la Mina da Passagem, de paredes altas y, por eso, puede ser accedida incluso por aquellos a quienes no les gustan los lugares apretados.