Gravity Concentrations at Montana Tunnels

Mary Anne Antonioli, Bryon Darnton and Steve LLoyd
Presented at: Randol Gold Forum 96 - Resort at Squaw Creek - Olympic Valley, California, USA - April 21-24, 1996

August 14th, 1998

The gravity circuit at Montana Tunnels has undergone many changes since its production startup in July of 1991. After initial positive test work, a manual Knelson 30 inch concentrator was installed and soon thereafter the circuit was modified with the addition of another KC-MD30. With the introduction of the center discharge or "CD" units the circuit was further enhanced to incorporate a single CD unit with a manual unit as back-up. In March of 1994 the decision was made to move and expand the gravity circuit. New cyclones were installed with two screens, each feeding a KC-CD30. This paper examines the evolution of the Montana Tunnels gravity circuit and follows the benefits in both recovery and cost.

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