WORKERS at Wiggins Island Coal Expert Terminal have raised concerns about what they say are potentially life-threatening issues at the site.
But unions won't confirm whether the issues will result in strike action.
CFMEU organiser Marshal Anderson said the dispute with Abi/Golding Joint Venture contractors related to emergency procedures and hygiene management.
Arguments also extended to workers having to reuse disposable cups for drinking.
Negotiations on site also have recently collapsed in relation to rosters.
While local workers had been working six days on, one day off or five days on and two days off, Mr Anderson said changes discriminated against locals.
"Abi/Golding JV are now trying to force a 21/7 roster on to local workers which the CFMEU considers to be a fly in, fly out roster," Mr Anderson said.
"We believe this roster is designed to force the local workers out of these positions... this will then almost definitely ensure that these positions will go to fly in fly out workers."
Mr Anderson said increasing the proportion of FIFO workers in the workforce would "destroys the community's lifestyle fabric".
A spokeswoman for WICET said the project owners and contractors were committed to workplace safety.