Changes in soil cover in Nechí, Antioquia: An approach to the environmental impact of mining, 1986-2010 by Gómez-Rodríguez, Michael Ezequiel, Molina-Pérez, Francisco José, Agudelo-Echavarría, Diana María, Cañón-Barriga, Julio Eduardo, Vélez-Macías, Fabio de Jesús