Mr Darcy was seen leaving the Woolpack Hotel on Market Street, Mudgee by friends at about 1am on Saturday morning.

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His last known location was behind the Town Hall Library on Market Street at about 2.30am.

Mr Darcy is described as about 183cm tall with a solid build, olive skin, short dark hair and brown eyes.

He was last seen wearing a mustard-coloured t-shirt with embroidery on the front with white writing with red roses on it. He was also wearing grey shorts.

Mr Darcy's mother, Sarah Cossey says he was seen by two girls after he left the Woolpack stumbling around on the road near the hotel and towards the crossing out the front of the Mudgee Town Hall Library.

She confirms they have seen video footage of this and 'shows that he was struggling.'

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"He was very unsteady on his feet and struggled to stay upright and quite disoriented. We are concerned that he may have stumbled into someone's yard or house so if everyone could check their sheds or anywhere around their homes," she said.

Local Police have been in contact with Mr Darcy's family and have conducted searches in the Mudgee CBD and surrounds but have been unable to locate Nate.

They urge anyone with any information to get in contact.

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Sarah said she wanted to specially thank Nate's family and friends who have spent the last day-and-a-half searching for him and the community who are going above and beyond to help and 'showing so much support.'

A post on social media reads:

'Still no news or contact from Nate. Please keep your eyes and ears out. If you don't feel comfortable calling one of us please call the police anonymously if you like and provide any info you might have. The smallest detail might help. Thank you all x'

If you have any information, call Mudgee Police on 6372 8599 or Crime Stoppers on 1800 333 000.