Coal mine protesters claim they've achieved their purpose following an ongoing blockade in north western NSW.
About 30 activists on Monday blockaded heavy vehicles at the Maules Creek mine site at Boggabri.
The trucks and machinery are used to build roads and a rail line at the site.
Two people attached themselves to a bulldozer via a cable.
Leard Forest Alliance spokeswoman Georgina Woods claimed one of the attached protesters had been arrested and taken away by police. Confirmation has been sought from NSW Police.
"We stopped a full day's work so we have achieved our purpose," Ms Woods told AAP.
Ms Woods said if the road to Whitehaven Coal's $767 million open-cut mine is cut through the forest, animals, plants and sacred Aboriginal sites would be lost.
She said protesters would remain at the site for weeks to come.
Whitehaven Coal chief executive officer Paul Flynn said the protesters had not changed the operation.
"The protesters there today...have not given rise to any material change to our operations at all," he told ABC Radio.
Protesters also blockaded the site in December after the Federal Court dismissed an application by the Northern Inland Council for the Environment (NICE), which had called for the approval granted by former Environment Minister Tony Burke to be overturned.
Police cut the activists free before arresting them.
Whitehaven has previously said the project would create 800-plus jobs and enjoyed support from most local residents.