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Appendix C - Cultural Heritage Impact Assessment - Peabody Energy

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It is noted, that specific subsidence predictions for the archaeological sites were not provided in the<br />

subsidence report by Holt (2005) which supported the 2005 SEE. For this reason, the predicted<br />

subsidence parameters for these sites based on the Approved Layout have been determined using<br />

the calibrated Incremental Profile Method, as described in Section 3.3.<br />

Summaries of the maximum predicted total conventional subsidence parameters for the<br />

archaeological sites within the Study Area due to mining in the Wambo, Arrowfield and Bowfield<br />

Seams, based on the Approved Layout and the Modified Layout, are provided in Table 6.13 and<br />

Table 6.14, respectively.<br />

Table 6.13 Maximum Predicted Total Conventional Subsidence Parameters for the<br />

Archaeological Sites due to Mining in the Wambo, Arrowfield and Bowfield Seams<br />

Based on the Approved Layout<br />

Type<br />

Maximum<br />

Predicted Total<br />

Conventional<br />

Subsidence<br />

(mm)<br />

Maximum<br />

Predicted Total<br />

Conventional<br />

Tilt (mm/m)<br />

Maximum Predicted<br />

Total Conventional<br />

Hogging Curvature<br />

(km -1 )<br />

Maximum<br />

Predicted Total<br />

Conventional<br />

Sagging Curvature<br />

(km -1 )<br />

Artefact Scatters 5300 40 0.7 1.0<br />

Isolated Finds 4300 25 0.5 0.4<br />

Scarred Tree 3000 15 0.5 0.1<br />

Table 6.14 Maximum Predicted Total Conventional Subsidence Parameters for the<br />

Archaeological Sites due to Mining in the Wambo, Arrowfield and Bowfield Seams<br />

Based on the Modified Layout<br />

Type<br />

Maximum<br />

Predicted Total<br />

Conventional<br />

Subsidence<br />

(mm)<br />

Maximum<br />

Predicted Total<br />

Conventional<br />

Tilt (mm/m)<br />

Maximum Predicted<br />

Total Conventional<br />

Hogging Curvature<br />

(km -1 )<br />

Maximum<br />

Predicted Total<br />

Conventional<br />

Sagging Curvature<br />

(km -1 )<br />

Artefact Scatters 6200 50 1.0 1.0<br />

Isolated Finds 6400 50 2.0 2.0<br />

Scarred Tree 3300 25 0.6 0.1<br />

The archaeological sites are located across the Study Area and, therefore, could experience the full<br />

range of predicted strains. The analysis of strains measured in the Hunter Coalfield, for previously<br />

extracted longwalls having similar width-to-depth ratios as the proposed longwalls, is provided in<br />

Section 4.4.<br />

Non-conventional movements can also occur and have occurred in the NSW Coalfields as a result of,<br />

amongst other things, anomalous movements. The analysis of strains provided in Chapter 4 includes<br />

those resulting from both conventional and non-conventional anomalous movements.<br />

6.14.3. Comparisons of Predictions for the Archaeological Sites<br />

The comparisons of the maximum predicted total conventional subsidence parameters for the<br />

archaeological sites within the Study Area, based on the Approved Layout and the Modified Layout,<br />

are provided in Table 6.15, Table 6.16 and Table 6.17.<br />

Table 6.15 Comparison of the Maximum Predicted Subsidence Parameters for the<br />

Artefact Scatters due to Mining in Wambo, Arrowfield and Bowfield Seams<br />

Layout<br />

Maximum<br />

Predicted Total<br />

Conventional<br />

Subsidence<br />

(mm)<br />

Maximum<br />

Predicted Total<br />

Conventional<br />

Tilt (mm/m)<br />

Maximum Predicted<br />

Total Conventional<br />

Hogging Curvature<br />

(km -1 )<br />

Maximum<br />

Predicted Total<br />

Conventional<br />

Sagging Curvature<br />

(km -1 )<br />

Approved Layout 5300 40 0.7 1.0<br />

Modified Layout 6200 50 1.0 1.0<br />

SUBSIDENCE PREDICTIONS AND IMPACT ASSESSMENTS FOR NWUM WMLW9 AND WMLW10<br />

© MSEC OCTOBER 2012 | REPORT NUMBER MSEC495 | REVISION C<br />

PAGE 55

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