My nomination of the best technical paper on the CIM conference proceedings CD: Design and construction evolution of the Kemess Mine tailings dam by T. Martin, G. Lysay, and S. Davidson. Here is a case history that is informative and well illustrated, and proves methods that could well be applied elsewhere. Even if you are not a tailings junkie, as I am, the story embedded in this paper makes it worth seeking out and reading. I make bold as to repeat part of the abstract (somewhat edited for readability):

The Kemess Mine tailings impoundment is retained behind an earthfill dam that, when complete, will be 110 m high with a crest length in excess of 1 km. Due to weak foundations conditions, the dam is raised at a downstream slope approaching 7H:1V. This requires an enormous volume of fill to construct the downstream shell of the dam. For the initial raising, the downstream shell of the dam was constructed with non-acid-generating waste rock from the open pit, 7 km distant and requiring a costly uphill haul. Feasibility studies were undertaken to evaluate raising the downstream shell using cycloned sands. This required inclusion of flotation cells for removal of residual sulfides from the tailings to produce the non-acid-generating product required for the downstream shell of the dam. These studies were positive: cycloned sand construction started in December 2002. This paper describes the experience gained with cycloned sand construction of the dam. Unique aspects include environmental controls needed to use the sulfide-bearing ores, preparation of the existing shell of the dam for subsequent hydraulic placement of cyclone tailings sand, on-dam settling ponds, water management issues, reclamation of the sand dam for erosion control given the wet climate of the site, and construction of an above-water beach of non-acid-generating tailings.