The Battle 4 Berrima Group claims Hume Coal still hasn't answered concerns about water security in its formal response to the Independent Planning Commission's Assessment Report.
Volunteers have spent the past couple of weeks trying to dissect the 670 page document.
Spokesperson Michael Verberkt says there are also question over about the ‘Pine Feather’ mining technique, which has never been carried out in Australia.
To view the response head to the Department of Planning's planning portal.
It's believed Hume Coal has now secured enough water rights to carry out out the project and could compliment this with the use of recycled water.
Mr. Verberkt says the COVID19 pandemic has thrown a spanner in the works in terms of when a final determination will be handed down.
IMAGE CREDIT: Battle 4 Berrima