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|Luscar Ltd. is currently developing open pit mining plans for the Telkwa Coal Project. Most waste rock is predicted to be non-acid generating but a proportion (less than 20%) is potentially acid generating. The waste management plan includes in-pit and ex-pit disposal of blended and till-capped waste rock, segregation and in-pit encapsulation of strongly potentially acid generating materials, and in-pit underwater disposal of coarse and fine tailings. The paper will present the steps used to design the waste management plan including the development of geochemical design criteria using various tests and theoretical and practical knowledge of waste behaviour.|