Castellanos-Barliza and León-Peláez 2023 investigated the recovery of physical-chemical and biological properties of Technosols in a chronosequence of drylands (over 7,10 and 21 years) in the El Cerrejón coal mine in Colombia. Their results showed significant improvements in soil properties, especially near the surface, with notable increases in soil N content and P solution after 7 years. Enhanced vegetation development over time contributed to higher soil organic matter, indicating successful rehabilitation and positive impacts of the restoration strategy in degraded mine spoils.