Antamina Mine

In addition to providing extensive water management services, Klohn Crippen Berger prepared closure plans and cost estimates for the Compañía Minera Antamina (Antamina). The Antamina mine is located in north central Peru, approximately 100 km east of Huaraz, at an elevation of 4,100 m. The main facilities consist of an open pit copper-zinc mine with rock waste dumps, a processing concentrator, and a tailings impoundment. Associated facilities include a 302 km concentrate pipeline and a concentrate dewatering and ship loading facility located at Puerto Punta Lobitos near Huarmey. The mine will cease primary production in 2019 and the long-term stockpiles will be depleted in 2022.

Closure plans included assessing works, physical and geochemical stability for the open pit, waste dumps, tailings, low grade and marginal grade stockpile areas. Closure plans were also prepared for the concentrator, mine site and port facilities, pipelines, valve stations and power lines. KCB developed a progressive reclamation program as well as environmental management plans following closure. Cost estimates and closure schedule were developed for progressive reclamation, closure works, engineering, inspections and permits, as well as long term operations and maintenance.