The Carmichael coal project faces more legal threats, with an amended challenge to the environmental approval for the mine.
The Mackay Conservation Group (MCG) has submitted to the Federal Court in Sydney that Federal Environment minister Greg Hunt failed to take into account conservation advice for two vulnerable species: The ornamental snake and the yakka skink.
Australian environmental laws require the minister to take into account advice from his own department, which MCG contends was not the case in the Carmichael approval.
MCG spokesperson Ellen Roberts said such processes were in place to protect vulnerable species from destructive activities.
"We have filed an amended application which argues that Minister Hunt is in clear breach of his own rules over the Carmichael approval," Roberts said.
MCG have quoted legal precedent taken from the Shree Minerals case in 2013, when it was found the environment minister of the day, Tony Burke, had failed to consider official conservation advice about Tasmanian devils in the Tarkine forests.
The legal challenge against the Carmichael project was originally lodged in January 2015, with the case to be heard on August 10 and 11.