6.3.4 Consequence classification
6.3.4.1 ANCOLD
Table 6.10 presents the consequence category assessment for Upper Mundic Gully according to ANCOLD for the Environmental spill scenario of both embankment stages.
Table6.10
Consequence Category Assessment for Upper Mundic Gully TSF ANCOLD (environmental spill)
Item
Stage 1
Stage 2
Total infrastructure costs
Minor Minimal repairs are expected since there is no risk of a dam break. The repairs are more related to correcting erosion and addressing minor issues in the embankment.
Same as Stage 1
Minor Some restrictions.
Same as Stage 1
business
Health and social impacts
Minor No dwellings, roads or any other third-party assets are expected to be harmed. However, it is expected that the discharged outflows cause minor impacts (less than $1 million in rehabilitation/compensation) to farm supply/use downstream. Minor It is expected that the spills from TSF will be contained in Dee River banks.
Same as Stage 1
Environmental impacts
Same as Stage 1
Overall consequence classification
Low
Low
6.3.4.2 DETSI
Table 6.11 presents the consequence category assessment for Upper Mundic Gully according to DETSI to Contain of both embankment stages.
Table6.11
Consequence Category Assessment for Upper Mundic Gully TSF DETSI (failure to contain overtopping)
Item
Stage 1
Stage 2
Harm to humans
Low No loss of life is expected. No contamination of water used for human consumption.
Same as Stage 1.
General environmental harm Low
Same as Stage 1.
It is expected that the spills from TSF will be contained in the banks of the Dee River.
Project No PS213278 Upper Mundic Gully TSF Stage 1 and 2 DBA and CCA Mount Morgan Gold Mine Heritage Minerals
WSP May 2026 Page 32
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