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The Value of Holistic Water Quality Assessment to Support Pit Lake Closure Decisions

Abstract

Decisions relating to pit lake closure can exert basin-scale influence on surface water and groundwater systems. This was evaluated in a water-stressed region where a flow-through pit lake was proposed as a community water resource. The integrated assessment considered climate, hydrology, groundwater and waste-rock seepage to test both lake viability and regional hydrological effects. The results show that closure decisions can change materially when pit lakes are assessed as part of the wider hydrological system, in-line with water stewardship principles.

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