Police haven’t ruled out foul play in the disappearance of a north Queensland mother of three, who vanished from a waterhole earlier this month.

Police are “starting to look deeper” at the possibility of foul play in the baffling disappearance of a woman at a north Queensland swimming hole 10 days ago.

Mother of three Shannon Leah Fraser, 30, hasn’t been seen since visiting Golden Hole, south of Cairns, on September 21.

She was with two men including her partner, who has told police he left her sitting alone under a gazebo near the river.

But when he returned between five and 10 minutes later she had vanished.

Local and specialist officers continue to scour dense rainforest in the area.

Far North Police District Detective Inspector Bruno Asnicar says there’s no evidence to suggest Ms Fraser was murdered but police are “starting to look deeper”.

“It’s becoming concerning now,” he said.

“Anybody that’s missing for this period of time in these circumstances, it gets to the point where you need to start looking deeper.

“We’ve reached a point now where I really want to examine this matter very, very closely.”

Insp Asnicar says it is possible Ms Fraser wandered off and became lost.

“The country that surrounds it is really, really difficult terrain and it would be very easy to disappear in that terrain and very difficult to find somebody.”

Investigators are getting down the “micro level” and Insp Asnicar says they want to speak to anyone in the area on September 20 or 21, especially those who took video footage.

They also want to speak to anyone who saw or owns a brown pop-top Combi van or green camper van spotted near the swimming hole.

At least two people who were speaking German were seen inside the green van.

“Please let me reiterate that nobody is in any trouble, they’re just assisting us with our inquiries,” Insp Asnicar said.

Ms Fraser’s mother, Deidre Sharrock, has said foul play is a possibility.

“It’s only speculation at this point but I think there’s been foul play,” she told reporters last week.

“I’m extremely concerned. I haven’t seen her for a week now.”

Ms Fraser, from Innisfail, south of Cairns, has been described as a bright, kind and sensitive woman.