Sub catchment Heritage Minerals activities
Potential Scenarios
Likely reduced poor-quality seepage volumes to 2 Mill
sumps 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 2
Mill sumps.
Potential for localised changes to groundwater flow
directions and expressions in mine target area “pits”
removing catchment from existing sumps.
Likely reduced seepage volumes to 2 Mill sumps in
medium to long term (reduced recharge and localised
changes to groundwater catchments).
Linda Gully
Processing plant
Improved surface water drainage reducing infiltration and
subsequent poor-quality seepage via diversion of “clean
water” to site storm water drainage and “dirty water” to
OCP
Mundic Creek
Sandstone Gully TSF
Potential for increased risk of poor-quality seepage to
dewatering*
Mundic West and Frog Hollow sumps from the OCP
where levels are above 270 m AHD in some climate
scenarios in short term.
Sourcing OCP make-up for
Potential for reduced risk of poor-quality seepage to
process plant water
Mundic West and Frog Hollow sumps.
Upper Mundic Gully TSF
Potential for seepage water with a better quality than
operation
OCP water to migrate to OCP through embankment.
Potential for seepage water with a better quality than
OCP water to migrate to Dam 8, however installation of
the concrete plug will reduce seepage potential.
Sandstone Gully TSF
Potential for seepage water with a better quality than
operation
OCP water to migrate to OCP through embankment.
Potential for high-quality seepage to Mundic West and
Frog Hollow sumps.
Mining Mundic and Red Oxide
Improved surface water drainage reducing infiltration and
tailings
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
Mundic and Frog Hollow sumps.
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Wulguru Technical Services Pty Ltd – Supporting Information to Amend an Environmental Authority
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