Final Landform Modification

My wife and I own & operate a farm in close proximity to the Werris Creek Mine . We have a bore for stock & domestic water and we had previously been told by a representative of the mine that our bore extracts water from the Werrie Basalt aquifer which has been intercepted by the mine above our property .Some years back during the mining activity our bore water quantity was reduced for a period of approximately 2 years before it recovered - this had never previously happened during 30 years of the life of the bore . Note that we have other shallow bores that are being monitored by the mine but they are in the higher Quipolly Creek aquifer but we know they were unreliable before the mine so we are not concerned about them - we rely totally on the Werrie Basalt bore that they do not monitor.
So we are concerned that the planned void will allow the aquifer to continually drain into the final wet void and thereby impact our bore capacity (quantity of water available ) . We note that mine's consultant states that the aquifer will eventually reach equalibrium but if there is water extracted from the void through evaporation , irrigation or any other purpose then the void water will be drawn from the aquifer .The mine claim that the void water will be mostly rain water but there is no way of accurately measuring the quantity of rain water entering the void and if it dosen't rain for an extended period there will be no rain water entering the void . During the recent drought the mine constantly pumped water out the mine while claiming it was rain water while at the same time 12 of our very reliable farm dams were empty - so how did they get so much rain water in the mine pit at the same time that there was no run-off into our dams- it appeared to us that the pit water that they pumped was more likely ground water .
The mine also claims that , because the ground water is flowing into the void , any contaminated water in the void cannot flow back into the aquifer but we are part of group that paid for an independent hydrologist who claimed that the water modelling used by the mine did not take into account all of the issues .
So we are concerned about what happens when the Whitehaven relinquish the mine and sometime after , perhaps the next drought , the predictions in the water modelling prove to be wrong and , as a result , the Werrie Basalt aquifer is contaminated and/or the quantity of water available to our is greatly reduced ?
So who is responsible if that happens ? Does Whitehaven have an ongoing obligation to guarantee what they are stating is accurate and if it is subsequently found not to be , must they take whatever action is required to provide any other persons that suffers a reduction in water quality and/or quantity with compensation and an alternate water source ?
We also object to any irrigation or other water extraction from the void for the reasons stated above .