Q. Was the sample size for static geochemical characterisation of the material to be mined by the Project adequate?
A. The core sampling strategy and effort followed a risk based approach consistent with relevant mining industry guidelines and previous sampling programs at other mines. In this regard, the sample size adopted for the Project is adequate for the purposes of the EIS.
Q. What are the salt release rates and other long term geochemical reactions post mine closure?
A. A decline in salt and sulfur generation and release rates towards an equilibrium value over time is expected from the bulk overburden/interburden materials. Coal reject materials at the Project are likely to be well mixed and therefore dilution of the relatively small amount of Potential Acid Forming (PAF) material from the Hoskisson Lower seam with Non Acid Forming (NAF) bulk coal reject material will produce ultimately a NAF coal reject material
Q. What are the potential impacts of salinity associated with long term seepage from the OEAs to receiving ecological values?
A. Given the expected decline in salt generation over time, it is improbable that mining landforms will generate salinity that has a significant impact compared to the existing conditions at the proposed onsite biodiversity areas and habitat downstream of the Project. In this regard, any long term seepage generated by the OEAs is not anticipated to significantly impact existing ecological values beyond the conditions currently experienced
Q. What are the potential impacts of salinity associated with long term seepage from the OEAs on agricultural resources and production?
A. Given the expected decline in salt generation over time, the mining landforms will not generate salinity that has a significant impact compared to the existing conditions of the adjacent alluviums, which is currently used for agriculture. In this regard, any long term seepage generated by the OEAs will not significantly impact existing agricultural enterprises beyond the conditions currently experienced