Qld police and SES volunteers are continuing an exhaustive search of two Rockhampton properties following the discovery of a human skull.

Detectives are keeping an open mind about whether a skull found on a central Queensland property belongs to one of two missing locals.

Human remains were found near Rockhampton on Wednesday afternoon and police say scientific officers could remain at the address for a further two days.

An exhaustive search is being conducted at two 1200-hectare properties.

The bones did not make up a complete skeleton and were being sent to Brisbane so the gender of the deceased can be established, Detective Inspector Darrin Shadlow said on Friday.

Police have notified the parents of local couple Chantal Barnett and Robert Martinez, who vanished from the area in March 2013.

But Det Insp Shadlow said police were refusing to jump to conclusions.

“We keep an open mind in relation to it and until the remains have been positively identified, we will keep an open mind in relation to the identity,” he told reporters.

Since the disappearance of Ms Barnett and Mr Martinez, police have taken statements from more than 400 people.

“Some of the information we have received, not only lately but throughout this investigation, has been vital to the investigation,” Det Insp Shadlow said.

Detectives have revisited some of those witnesses after the discovery of the remains.

Police believe some people may know what has happened to the missing couple, Det Insp Shadlow said.

“We just ask them to look inside themselves and show a bit of conscience and come and see us.”