To assess the potential impact of Heritage Minerals Project to groundwater and the operation of the
Upper Mundic Gully TSF, Table 36 provides a summary of expected outcomes for each catchment
associated with groundwater flows. This builds on the post mining conceptual source-pathway-receptor
summary anticipated changes to the hydrogeological system and modelled groundwater inflow changes
developed by GHD (2017) and RGI (2010 and 2011) groundwater catchment mapping and simulated
groundwater flows.
Table 36. Potential Scenarios for Groundwater/ Seepage Flows
Sub catchment Heritage Minerals activities
Potential Scenarios
Arnolds Gully
Reactivation of Horse Paddock
Improved surface water drainage reducing infiltration and
Waste Rock Dump
subsequent poor-quality seepage via careful placement,
compaction, shaping and capping of ARD waste rock by
placement of overlying NAF waste rock.
Potential for seepage water quality to further degrade in
short term (reduced recharge), draining and expressing to
Arnolds Sump.
Likely reduced poor quality seepage to Arnolds sump in
medium to long term (reduced recharge).
Nelsons Gully
Reactivation of Horse Paddock
Improved surface water drainage reducing infiltration and
Waste Rock Dump
subsequent poor-quality seepage via careful placement,
compaction, shaping and capping by placement of
overlying NAF waste rock.
Potential for seepage water quality to further degrade in
short term (reduced recharge), draining and expressing to
Nelsons sump.
Likely reduced poor quality seepage volumes to Nelsons
sump in medium to long term (reduced recharge).
Mining of 2 Mill tailings
Improved surface water drainage reducing infiltration and
subsequent poor-quality seepage via removal of ARD
generating mine waste (tailings).
Potential for seepage water quality to improve in short
term (ARD source removal), draining and expressing to
Nelsons Sump.
Likely reduced poor-quality seepage volumes to Nelsons
sump in medium to long term (reduced recharge).
No. 2 Mill
Reactivation of Horse Paddock
Improved surface water drainage reducing infiltration and
Waste Rock Dump
subsequent poor-quality seepage via careful placement,
compaction, shaping and capping by placement of
overlying NAF waste rock.
Potential for seepage water quality to further degrade in
short term (reduced recharge), draining and expressing to
2 Mill sumps.
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Wulguru Technical Services Pty Ltd – Supporting Information to Amend an Environmental Authority
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