Table 60. Risk Assessment Results
Aspect
Potential Impact
Risk Rating
Risk Controls
Residual Risk Rating
Treatment
L
C
R
L
C
R
TSF designed by RPEQ in
accordance with DETSI guidelines
and ANCOLD best practice.
Given the total volume capacity of
both assessed stages of the TSF, a
flood included overtopping failure was
None identified. The proposed amendments
deemed as non-credible.
are unlikely to result in further impacts to
surface water values in the Dee River and
Failure mode analysis undertaken that
downstream riverine systems. The addition of
Release of tailings/
indicates the OCP would buffer most
the Upper Mundic Gully TSF to the tailings
water from Upper
of the receiving water in most release
water management inventory will provide
Mundic Gully TSF
scenarios.
Water
Possible High
13
Unlikely Minor
5
greater resilience against climatic extremes
causing impact to
The TSF size has been designed to
which reduces the likelihood of overtopping
surface water
accommodate a PMP storm event.
events to ALARP. Heritage Minerals will not be
receptors
discharging water into the Dee River as part of
Annual regular maintenance
mining operations.
inspections in accordance with EA
conditions in Schedule H and the
Manual for Assessing Consequence
Categories and Hydraulic
Performance of Structures
(ESR/2016/1933) .
Reduce potential for seepage from
TSF into Dam 8 through construction
201
Wulguru Technical Services Pty Ltd – Supporting Information to Amend an Environmental Authority
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