Himpunan Hijau has vowed to block the main entrance to Lynas Corporation's rare earths refinery in Gebeng, Pahang, from June 22.

Himpunan Hijau leader Wong Tack said he hopes all Malaysians will take part in the blockade to “protect Malaysia and our children”.

"We will make sure nothing goes in or out. We hope this will disable the Lynas plant operations and the plant will become an island," Wong told a press conference yesterday.

"This might take months or years. We will stay on. Some have raised concerns about protesters needing to tend to work and home. Well, I will still be there."

Wong expects the police to clamp down on protesters, but declared that Himpunan Hijau will not waver from its objectives.

"Good citizens should not be punished. When the authorities can't take up their duties, we do it on their behalf, (so) they should be appreciative," he said.

He said BN leaders were responsible for allowing the plant to operate, but were also welcome to join the protest, if they wished to.

In particular, Wong said, MCA president and Lynas rare earths refinery watchdog committee chairperson Liow Tiong Lai, who is also MCA president, should be present and prepare proper reports for the public.

This is Lynas' third attempt to stymie the plant's operations. The first two attempts were not successful.

Himpunan Hijau secretary Bang Seet Ping (left) pointed out that Lynas' share price has dropped from A$2.70 to A$0.17, which shows that this is the opportune moment to put more pressure on the company.

Putrajaya has given Lynas generous incentives to build the refinery when it was not allowed to operate in Australia, where the ore is for the plant mined, due to environmental concerns, Bang said.

Rare earths refining produces toxic waste, but Lynas has claimed that the waste can be fully recycled into inert by-products. Some experts have rubbished this claim.

There is no word from the government on whether it is holding Lynas to its promise, although the plant has been in operation since December 2012.