技术报告-尾矿库设计及评估 (英文)(26)

liquefaction) do not apply to this design. The lack of dam walls reduces the possibility of slope failure, but

the stability of the pit slopes do have to be checked.

Unless the purpose is to isolate sulfide tailings underneath water, the water table should be below the tailings

disposed in the pit. This may require backfilling with mine rock or overburden. If backfilling underneath the

tailings is necessary, and/or if the surrounding rock is not sufficiently impermeable, a liner may be required.

Ritcey (1989) notes that the hydrogeological parameters affecting the migration of seepage and contaminants

are poorly understood, so tailings with toxic contaminants or reactive tailings may be poor candidates for this

type of impoundment.

When mining in an active pit is proceeding laterally, the mined-out portion of the pit may be suitable for

tailings disposal. In such cases, dikes would be constructed to impound the tailings in the mined-out area.

This embankment could then be raised in a phased approach (Ritcey 1989).

2.2.4Specially Dug Pit Impoundment Design

This design is fairly unusual and involves the excavation of a pit specifically for the purpose of tailings

disposal. The impoundment consists of four or more cells with impermeable liners and surrounded by an

abovegrade dam. Material removed from the pit is used in construction of the dam. This dug pit/dam design

has some of the same advantages as the ring-dike design, including site independence and uniform shape.

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