Twelve protesters have been now been arrested at an anti-coal seam gas (CSG) blockade south of Grafton, on the New South Wales north coast.
About 150 people are trying to stop a Metgasco drill-rig getting onto a property at Glenugie.
Police earlier brought in a crane to clear a path to the access gate where the demonstrators have erected tripods.
One of the arrest came when a protester tried to give water to another activist, locked on to a truck in the convoy.
Police had to grind off lock-on devices to release two protesters, but one is still locked on to the truck.
The drill rig and a number of other large trucks carrying equipment and Metgasco work vehicles are still waiting to enter the site.
For great images: