Tierra Group engineers designed La Esperanza TSF, a 2.1-km long, 35-m high, earthfill tailings dam with an HDPE lined impoundment footprint of 840,000 m2. Tierra Group  designed and provided Construction Quality Assurance (CQA) for all subsequent downstream dam stages. Stage 6 and 7 dam crest raise designs incorporated mechanically stabilized earth (MSE) methods to maintain the facility within property boundaries, and reduce construction costs. Tierra Group also developed the detailed closure design for the Esperanza TSF. 

Tierra Group serves as the Engineer of Record (EoR) for the Esperanza TSF. As the EoR, Tierra Group conducted TSF dam breach and downstream inundation analyses, developed detailed TSF water balance, reviewed monthly monitoring data, conducted annual TSF inspections, and prepared an annual monitoring report to document TSF performance and dam safety.