Tierra Group performed geotechnical investigation, water balance, and the Phase 2 heap leach pad (HLP) optimization design at Agnico Eagle’s La India Mine in Sonora State Mexico. Tierra Group provided Construction Quality Assurance (CQA) during initial construction and expansion of the Phase 2 HLP. Tierra Group also conducted an evaluation of current soil cover to aid in prevention of rock acid generation.

Tierra Group provided engineering design services related to Phase 2 HLF and associated ponds and water management structures. The Phase 2 expansion optimized the HLP and provided approximately 37.6 Mt of additional capacity. Tierra Group provided CQA during initial construction and expansion and evaluated current soil cover to prevent acid rock generation.

Tierra Group also provided construction observation, sampling and field testing, and GCL and geomembrane installation. A geo-electrical study was implemented to detect leaks in the geomembrane after drain gravel (over-liner) placement.

Tierra Group provided engineering design services related to Phase 3 HLF and associated ponds and water management structures. In addition, Tierra Group conducted a geotechnical investigation consisting of borehole drilling, test pits, and geophysical survey. The Phase 3 expansion optimized the HLP and provided approximately 13 Mt of additional capacity. Tierra Group provided CQA during initial construction and expansion and evaluated current soil cover to prevent acid rock generation.