Technical Discipline
Proposed works
Conditioning Approach
Timeframe
TSF Design
Development of a geological ground model using available survey, aerial imagery and geotechnical investigations
NA – existing Schedule H conditions from the EA provide requirements regarding the design and construction of a regulated structure NA – existing Schedule H conditions from the EA provide requirements regarding the design and construction of a regulated structure NA – existing Schedule H conditions from the EA provide requirements regarding the design and construction of a regulated structure NA – existing Schedule H conditions from the EA provide requirements regarding the design and construction of a regulated structure
30 June 2027
TSF Design
Further seepage and stability assessment based on geotechnical investigations
30 June 2027
TSF Design
Detailed design of the tailings slurry pumping and delivery system
30 June 2027
TSF Design
Water balance development to: - Determine the DSA requirement -
30 June 2027
Size the return water pump system Size the final stage spillway
-
TSF Design
Conceptual closure design including closure spillway location, channel sizing and PMF assessments
NA – Existing condition H24 requires submission of a decommissioning plan to the administering authority at least one (1) year prior, to decommissioning any regulated structure specified in the EA.
30 June 2027
TSF Design
Detailed design phase including preparation of construction drawings and documentation and RPEQ approval Watercourse reconnaissance to provide site specific observations of surface water conditions and interaction with groundwater systems Geological mapping to improve the definition of subsurface conditions relevant to the UMF TSF seepage assessment Update seepage management plan following the completion of site investigations
NA - Existing condition H4 suitable
30 June 2027
Seepage management plan
NA – Existing conditions H1-H3 suitable
30 June 2027
Seepage management plan
NA – Existing conditions H1-H3 suitable
30 June 2027
Seepage management plan
NA – Existing conditions H1-H3 suitable
30 June 2027
CCA
Update CCA
Existing condition H1-H9 considered suitable
NA – dependent on completion
of other studies 30 June 2027
Groundwater
Execution of the proposed groundwater investigation summarised in Section 6.6.8
Prior to the construction of the Upper Mundic Gully Tailings Storage Facility, the environmental authority holder must install and provide to the administering authority the locations of groundwater monitoring bores to monitor groundwater quality at the Upper Mundic Gully Tailings Storage Facility. Table W1 must be updated to include the
name and location of the additional monitoring bores that are installed
Project number: 25B061
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