Groundwater modelling is undertaken for 12 coal resource development pathway mines and 1 coal seam gas development, comprising 5 baseline mines and 8 additional coal resource developments. The Caroona Coal Project is included in the modelling of the coal resource development pathway based on the information available at the time of commencement of the bioregional assessment work. However, the latest available information is that this mining project is cancelled and the impact predictions provided in this report are redundant. One baseline and two additional coal resource developments were not modelled due to lack of data or scale of proposed change.
The spatial extent of each mine working is represented in the model by its footprint and varies through time. Each working is associated with a coal seam, which defines its depth. Footprints were obtained from a number of sources. Each development is included in the model as a head-dependent boundary which results in the water produced being dependent upon the model parameters rather than an imposed stress.
Hydraulic enhancement above longwall mines is implemented over the mine footprint and the change is assumed to be permanent. The magnitude of and depths over which hydraulic enhancement occur is uncertain and the parameters that govern these terms are varied in the uncertainty analysis.
Table 8 and shown in Figure 16. The baseline includes six coal mines; the additional coal resource development includes nine coal mines and one coal seam gas (CSG) development. Due to insufficient data or insignificant changes in mine pumping rates from additional coal resource development, two coal mines in the additional coal resource development were not included in the modelling. Of the baseline coal mines, Werris Creek Mine is not modelled because it belongs to a geologically separate basin (Werrie Basin). For the 12 modelled mines and 1 CSG development, each has to be defined in terms of its location, type of operation (open-cut, underground or CSG), area, depth (seam) and depth of excavation. A few parameters also need to be defined to characterise changes in the hydraulic conductivity of units above and below the mine workings as a of mining. For the one CSG development, the spatial extent, target depth and proposed need to be defined.coal mines and were defined in Section 2.3.4 of companion product 2.3 for the ( ) and are summarised in
Table 8 Summary of developments modelled under the baseline and coal resource development pathway (CRDP)
aWerris Creek Mine is modelled in the surface water modelling but is commentary only in the groundwater modelling.
bGunnedah Precinct and Vickery South Coal Project are in the CRDP but are commentary only.
CSG = coal seam gas
ACRD = additional coal resource development
Data: Bioregional Assessment Programme (, )
Product Finalisation date
- 18.104.22.168 Methods
- 22.214.171.124 Review of existing models
- 126.96.36.199 Model development
- 188.8.131.52 Boundary and initial conditions
- 184.108.40.206 Implementation of the coal resource development pathway
- 220.127.116.11 Parameterisation
- 18.104.22.168 Observations and predictions
- 22.214.171.124 Uncertainty analysis
- 126.96.36.199 Limitations
- Currency of scientific results
- Contributors to the Technical Programme
- About this technical product