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The Oberon de Weber open pit is part of the Pinos Altos Mining Complex owned by Agnico Eagle Mines Ltd. in Mexico. A project was initiated in 2013 to enable the deposition of tailings in this soon-to-be exhausted pit while mining the underground portion of the deposit extending below the pit. A conceptual plan was proposed for constructing the tailings facility and mining the crown pillar below it. A series of investigations, preliminary and detailed studies, and a risk assessment were conducted to prepare a plan that was technically sound, safe, and environmentally secure during operations and after closure. Several alternatives were considered and analyzed to optimize the recovery of the high-grade ore. Economic and technical analyses supported the construction of an artificial crown pillar within a narrow trench excavated at the pit bottom, combined with a 10-m rock pillar above the underground stopes. This paper describes construction of the facility, water management, and instrumentation of the crown pillar. The Oberon de Weber Tailings Storage Facility has been in operation since the end of 2015 and is performing well. The crown pillar extraction has been successful, exceeding the planned resource recovery.

Artificial crown pillar construction and in-pit tailings disposal at the Pinos Altos Mining Complex, Mexico