Malcolm Hudson - then aged 42 - is believed to have left a camp in South Kerribee, near Fords Bridge north-west of Bourke, in late November 1989.

He has not been seen or heard from since.

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Mr Hudson was in the area for the purpose of completing contracted fence work on the property and had been camping there with several people before his disappearance.

He was reported missing to police on Thursday 21 December 1989 and an investigation began.

A coronial inquest commenced and on Wednesday 14 July 1993, the coroner declined to find that the death of Mr Hudson had occurred.

Detective Inspector Paul Quigg said investigations continue by officers attached to Central North Police District, together with the Missing Persons Registry.

"Extensive inquiries have been made by police to date and we continue to seek any information which the community may have to progress the investigation into the last known whereabouts of Malcolm Hudson," he said.

"Any information provided will be treated with the strictest of confidence."

At the time of his disappearance, Mr Hudson was described as being of Aboriginal/ Torres Strait Islander appearance, of a medium build, with short/medium length black hair and a full beard.

"We want to provide some closure to Mr Hudson's family," Detective Inspector Quigg said.

"His disappearance is definitely out of character for him, and police believe someone out there in the community knows something in relation to his disappearance.

"Missing persons cases have a traumatic toll on families who never get over their loved ones vanishing.

"These families continue with their lives longing for closure or any information on the circumstances in which their family member went missing.

"Malcolm's family deserve answers and we are hoping someone out there can provide that."

Mr Hudson's family continue to appeal to the public to contact police with any information they have in relation to his disappearance.

"The family appreciates all of the efforts of the NSW Police Force in attempting to find answers on what happened to Malcolm, we never stop thinking about him," a family spokesperson said.

Missing Persons Week is an annual national campaign to raise awareness of the issues and impacts surrounding missing persons and runs between August 1 and August 7.

If you have been reported as missing it means that someone is concerned about your safety and welfare. It is not a crime to go missing. You should attend the nearest police station with identification so that police can ascertain that you are safe and well.

For more information on the campaign visit www.missingpersons.gov.au

As inquiries continue, police are appealing for anyone with information about Mr Hudson's whereabouts to contact Crime Stoppers: 1800 333 000 or https://nsw.crimestoppers.com.au.

Information is treated in strict confidence. The public is reminded not to report information via NSW Police social media pages.