Police excavating Bowen landfill in search for Rachel Antonio

Police will excavate a Queensland landfill in the hope of uncovering clues into the disappearance of a teenage girl who went missing more than 20 years ago.

Officers will spend Wednesday examining the Bowen tip, to as part of their ongoing investigation into the disappearance and suspected homicide of 16-year-old Rachel Antonio in 1998.

She was last seen walking along the Queens Beach Esplanade in Bowen on April 25.

Detective Inspector Nikki Colfs said 10 officers would be involved in the one-day exploratory examination of the tip which is designed to determine the level of refuse when Rachel disappeared.

"The Antonio family deserve to know what happened to Rachel, and the Queensland Police Service remains committed to finding her," she said.

"We will endeavour to undertake a scientific evaluation of the refuse and the environmental conditions that were present in 1998."

Police say they have not received any new information about the possible location of Ms Antonio.

A $250,000 reward for information which leads to the recovery of her remains has been offered.

A coronial inquest into Ms Antonio's disappearance and suspected homicide was held in May 2016.