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The Bruno Creek Tailings Impoundment, located in seismically-active central Idaho, United States of
America, retains tailings behind one of the tallest centreline-raise cyclone tailings sand dams in the world.
From a current height of approximately 170 m, the dam is proposed to be raised to a height of nearly 230 m
based on projected life of mine (LOM) ore reserves. An alternatives evaluation indicated the preferred
option for tailings expansion is to raise the existing facility using the centreline raise method over most of
the dam alignment, but modifying the design to employ a partial realignment of the dam crest at the left
abutment. This change will result in a length of the previously centreline-raised dam being constructed over
an existing tailings beach. The design also includes steepening of the downstream dam slopes, as well as
construction of a raise on the existing rock toe dam to limit downstream impacts. This paper presents the
geotechnical design aspects of the project, focusing on the site seismicity and assessment of dynamic
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Innovative expansion of a large centreline constructed tailings storage facility in a K.F. Morrison et al.
216 Mine Waste 2010, Perth, Australia