Anti-uranium protesters will make the "symbolic gesture" of bashing a bull pinata, representing Toro Energy, outside a uranium conference while the firm's chief is addressing delegates.
Protesters have traditionally camped outside during the morning sessions of the two-day Australian Uranium Conference in Fremantle, south of Perth, complete with costumes, signs and music.
But this year organisers have chosen the afternoon session of the second day to target Toro Energy for its plans to develop the State's first uranium mine in WA's mid-west region.
In May, the Environmental Protection Authority (EPA) approved a proposal to develop the mine 30km from Wiluna.
Anti-Nuclear Alliance of WA spokesman Marcus Atkinson said the protesters would make the "symbolic gesture" of bashing a pinata shaped like a bull - after Toro Energy's logo - as managing director Greg Hall made his presentation at the conference on Thursday.
Since the EPA approved Toro Energy's proposal, several anti-uranium groups have indicated they will appeal the decision, but Mr Hall told AAP there had only been nine complaints.
"What we've got here are activists who never change their view," he said.
"The public know exactly what our plans are, so inquiries are just getting down to the hard-core anti-nuclear activists.
"Anti-nuclear groups will always say there's not enough information."
Mr Hall said the company had held three meetings with the Conservation Council and taken representatives on two site visits.
"But they're not interested in engaging about the project - they just want to stop it."
Mr Hall said he expected Environment Minister Bill Marmion would give Toro Energy the go-ahead by the end of September.
A Federal Government decision would be expected about a month later, he said.