A NEW South Wales farmer, with the support of environmental advocates The Sunrise Project, has written an open letter to Federal Environment Minister Greg Hunt to ask he reject any project with "unacceptable impacts" on water supplies.
In the letter, Anne Kennedy of Coonamble in NSW - four hours drive west from Tamworth - joins with 12 environmental, water and mining experts to ask the government to ensure water supplies are protected.
These include Dr Matthew Currell of RMIT University, retired Queensland Government hydrologist Roger Clarke and Dr Gavin Mudd of Monash University.
Ms Kennedy also leads the NSW Artesian Bore Water Users Association.
The government has previously agreed to apply a water trigger, an extra layer of regulation for major water-intensive projects, to 47 proposed coal and gas developments.
"Water is our most precious resource: it is our lifeblood," the letter reads.
The group ask for the government to "say no to major mining projects if it is found that they will have unacceptable impacts on this irreplaceable resource".