Original EA Amendment

4.3.2.2.7.

Environmental Spill/Failure to contain (Overtopping Consequence) - ANCOLD

Table 24 presents the consequence category assessment for Upper Mundic Gully according to

ANCOLD for the “Environmental spill” scenario of both embankment stages.

Table 24. Consequence Category Assessment for Upper Mundic Gully TSF – ANCOLD (Environmental Spill)

Item

Stage 1

Stage 2

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

Total infrastructure costs

Impact on dam owner’s

Minor Some restrictions

Same as Stage 1

business

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 discharge in the Open pit and will be contained in Dee River banks when spills from the Open pit.

Same as Stage 1

Health and social impacts

Same as Stage 1

Environmental impacts

Overall consequence

Low

classification

4.3.2.2.8.

Environmental Spill/Failure to contain (Overtopping Consequence) – DETSI

Table 25 presents the consequence category assessment for Upper Mundic Gully according to DETSI

for the “Environmental spill” scenario of both embankment stages.

Table 25. Consequence Category Assessment for Upper Mundic Gully TSF – ANCOLD (Environmental Spill)

Item

Stage 1

Stage 2

Low No loss of life is expected. No contamination of water used for human consumption. Low It is expected that the spills from TSF will discharge in the Open pit and will be contained in the banks of the Dee River when spills from the Open pit. Low No dwellings, roads or any other third- party assets are expected to be

Same as Stage 1

Harm to humans

Same as Stage 1

General environmental harm

General economic loss or

Same as Stage 1

property damage

Wulguru Technical Services Pty Ltd – Supporting Information to Amend an Environmental Authority