By Linda Hinshaw

Written by way of experts from the mining undefined, this choice of over sixty papers from the 11th annual Tailings and Mine Waste convention offers with technical features and advancements, to boot as regulations and environmental concerns. It includes papers on themes similar to website characterization, radioactivity and danger and case histories.

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Additional resources for Tailings and mine waste '04: proceedings of the Eleventh Tailings and Mine Waste Conference, 10-13 October 2004, Vail, Colorado, USA

Sample text

The volume of water is then compared to the water balance predicted volume and the assumptions in the water balance adjusted as necessary.  Level­actuated pumps cycle to pump the seepage collected in the sump back to the tailing impoundment.  The pumps and associated piping are housed in a heated building to accommodate winter operation.  This secondary recovery system assures the impoundment operates as a zero discharge facility.  The piezometers create a flow path for water moving down the foliation between the wells into foliation or fracture zones feeding the wells.

The water balance accounts for snow pack and ice formation during the winter months along with breakup conditions and runoff in the spring.  Tailing lines are not heat traced or insulated but are constructed to accommodate completed drain down of the gravity distribution system. 1 Tailing deposition To maximize in­place tailing densities and minimize ice formation, subaerial deposition is utilized during the summer months and subaqueous during the winter months.  Spigoting is rotated between the major drainages and two strategically located spigots to control the location and geometry of the operating pool within the impoundment.

Into account in the design and construction phases of the project.  Special consideration had to be given to mitigating the affect of erosive seepage flows at the foundation level to protect the embankment fill materials.  Figure 1 shows the areal extent of the borrow investigation in the vicinity of the tailings dam and relative quantities of borrow materials present.  Geotechnical analyses performed included a detailed seismic risk analysis, slope stability analyses, finite element seepage analyses, and geotechnical evaluation of construction considerations, such as foundation treatment and temporary construction slope considerations in permafrost zones.

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