Metropolitan Coal Project Independent ... - Peabody Energy

Metropolitan Coal Independent Environmental Audit
Condition
No.
3/1 Table 1: Subsidence Impact Performance Measures
Cliffs
Less than 3% of the total length of cliffs
(and associated overhangs within the
mining area) experience mining-induced
rock fall.
3/1 Table 1: Subsidence Impact Performance Measures
Heritage
Aboriginal Heritage
Sites
Items of historical or
heritage significance at
the Garrawarra
Centre
Built Features
Built Features
Condition Verification Compliance Comments
Less than 10% of Aboriginal heritage
sites within the mining area are affected
by subsidence impacts.
Negligible damage (that is fine or
hairline cracks that do not require
repair), unless the owner of the item
and the appropriate heritage authority
agree otherwise in writing
Safe, serviceable and repairable,
unless the owner agrees otherwise in
writing.
Not activated
C
C
Ongoing
C
Ongoing
C
Ongoing
No other endangered populations were recorded
within the study area.
Swamps 76, 77 & 92 –
Long-walls 20-22 do not undermine these
swamps and it was reported that there is no
intention to mine beneath these swamps at this
time.
Cliffs - Less than 3% of the total length of cliffs (and
associated overhangs within the mining area) experience
mining-induced rock fall.
Five cliffs and overhangs have been identified
within 600m of LW 20-22. These features are
subject to monthly monitoring during extraction
(within 400m of the sites). Similarly steep slopes
within 600m of LW 20-22 have been routinely
monitored during extraction. No subsidence
related impacts have been observed in steep
slopes, cliff lines or overhangs.
Aboriginal Heritage Sites - all Aboriginal
heritage sites located within the 35º Angle of Draw
of the long-walls 3-6 months after the completion
of the long-wall, by an archaeologist experienced
in rock art recording and management and an
Aboriginal stakeholder representative.
In the 2010 and 2011 period monitoring of Aboriginal
heritage sites, two affected sites were identified:
FRC 12 - weathering to the Darmulan engraving
was observed during the 2010 survey. This
weathering effect did not appear to have
deteriorated in the 2011 monitoring survey.
FRC 139 showed a significant level of cracking of
the rock platform during the 2011 site monitoring
survey.
All other Aboriginal heritage sites
surveyed/monitored during 2011 (14 sites) did not
show any changes/deterioration.
Garrawarra Centre - the Garrawarra Complex is
located more than 3 km from long-walls 20-22 and at
this distance no measurable systematic or nonsystematic
subsidence movements are anticipated.
Built Features – no subsidence impact
performance measure for built features was
exceeded during 2009 and 2011.
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