As a part of Solid Energy's progressive rehabilitation of the Stockton
Mine, it was determined that significant rehabilitation of the existing Mt
Frederick Sidecast would be required to ensure the long-term stability of the
sidecast. The goal of this rehabilitation is to reshape the existing stockpile
into a more stable slope configuration, and the construction of a comprehensive
stormwater collection and discharge system. The reconfigured slopes will
facilitate the final revegetation of the exposed surfaces and the management of
surface and groundwater discharges from the area. This paper briefly describes
the specific details of the project and the significance of seismic conditions
on the long-term stability of the reconfigured stockpile.