Development and Construction of the Antamina Surface Water Management Facilities

CIM Edmonton 2004
Matt T Schuett, Duncan McInnis,
Abstract The Antamina mine site is located 4300m above sea level in the Peruvian Andes approximately 285 km north of Lima. When running at full production Compañia Minera Antamina’s mine is the 7th largest copper producer, 3rd largest zinc producer and the largest combined mine in the world. As the mine is situated at the headwaters of Antamina Creek, space is at a premium and steep slopes having high runoff rates in an area inundated by rain for four months of the year make maintaining surface water discharge criteria difficult. Antamina is 90% Canadian owned and as such adopted Canadian standards for surface water discharge criteria. To meet discharge criteria a series of decentralized sedimentation / treatment ponds collecting water from haul roads and mine workings was modeled and designed to treat the 1:10 year flow. The final clarifying pond contains 13 cells, with each cell separated by gabion filtration dams. The treatment system was designed and built to be flexible giving mine operations maximum control and expansion alternatives as the mine develops. Ongoing monitoring has indicated that system is exceeding expectations.
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