Sub catchment Heritage Minerals activities
Potential Scenarios
Likely localised changes to groundwater flow directions
and expressions in mine target area “pits” removing
catchment from existing sumps. Ground inflow to mine
target area “pits” will be high in the short term and will
reduce along with OCP water levels.
Likely reduced seepage volumes to Mundic and Frog
Hollow sumps in medium to long term (reduced recharge
and localised changes to groundwater catchments).
Reactivation of Airfield Dump
Improved surface water drainage reducing infiltration and
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
Mundic West and Frog Hollow sumps.
Likely reduced poor-quality seepage to Mundic West and
Frog Hollow sumps in medium to long term (reduced
recharge).
Light of Day
Nil
Nil
Shepherds
Mining Shepherds 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
Shepherds sumps.
Likely reduced poor-quality seepage volumes to
Shepherds sumps in medium to long term (reduced
recharge).
Remediation of Shepherds
Improved surface water drainage reducing infiltration and
Outer 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
Shepherds sumps.
Likely reduced poor-quality seepage to Shepherds sumps
in medium to long term (reduced recharge).
In summary, there is likely to be reduced inflows into existing sumps from groundwater and sub-surface
flows in comparison to those under existing conditions. This is expected to result in improved
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Wulguru Technical Services Pty Ltd – Supporting Information to Amend an Environmental Authority
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