SGME T-02 Memorandum
(acacias are also suited to thicker soil covers). For higher transpiration rates in neutral and slightly acidic conditions, faster growing species such as Corymbia tessellaris and Eucalyptus tereticornis should be used. 1.3.7 Closure monitoring and maintenance Standard TSF closure monitoring and maintenance activities are proposed to facilitate that rehabilitation objectives and goals have been achieved. Maintenance activities are typically undertaken when earthworks are required to address large scale soil movements. This would mostly likely be associated potential tailings settlement affecting the surface profile. Remedial options will depend on the root cause of the issues but will likely include earthworks to reprofile landforms. Contributing factors may be related to: Tailings settling; Climatic conditions (i.e. droughts); Drainage not functioning as per design; and Unexpected soil erosion. Expected maintenance activities include: Documentation by EoR that the tailings surface is dewatered sufficiently to allow the construction of closure features including spillways and bunds; Development of as built survey measuring the final TSF geometry; Completion and RPEQ approval of TSF closure design plans for implementation; Further investigations and FoS modelling to determine that the minimum closure criteria in the schedule has been achieved and that the landform is safe and stable; Collection of as built survey information recording the TSF closure spillway features; Verification of decant decommissioning;
Discharge water quality monitoring Groundwater quality monitoring; Piezometer monitoring; Verification that capping design is performing as intended; Rehabilitation monitoring of vegetative surface;
Page 5
Powered by FlippingBook