As part of a previous project at Minera Los Frailes, Technosols were designed and formulated as a viable and sustainable alternative to the traditional closure of mining components. For a next stage, it was proposed to demonstrate the effectiveness of the main soil designed on a pilot deposit built with the generating material obtained from the waste dumps. In order to obtain comparable results in terms of both water balance and quality of recovery of the materials, a control deposit was made with the same type of material and configuration.