Missing three days: Search for Kiwi man Henry Roach who disappeared while holidaying on the Gold Coast

Henry Roach was last seen at the Mermaid Beach resort, where he was staying, on Friday evening. Photo / Supplied

The partner of a Kiwi missing on Australia's Gold Coast is "trying to keep it together" as the search for the 46-year-old resumes for the third day.

Christchurch resident Henry Roach had been holidaying in Mermaid Beach with his partner and her 10-year-old son when he disappeared on Friday night.

His partner's daughter Sasha Palmer said the trio had been in the area since Tuesday. They were due to fly out tomorrow evening, but she said her mother's plans were now up in the air.

"She's trying to keep it together for my 10-year-old brother, but she's told me she feels like she's falling to pieces.

"It's been making it hard for me to sleep at night."

According to Palmer's mother, Roach had been with a friend the evening he disappeared. He had gone to tell his partner he might have a drink with a friend he had met on their holiday, but this didn't end up happening.

The friend he was with thought he had gone back to his room, but he didn't return.

"They had been to Sea World that day," Roach said.

"Mum said the holiday was going perfectly - there were no arguments or anything."

Palmer said they had planned on going to Movie World the day after he disappeared. Roach had been telling his stepson how excited he was to tick it off the list of theme parks.

Instead, the family were now working with one of Roach's cousins, who lived in the area, to put out flyers and co-ordinate their own search.

In a statement, Queensland Police said Roach was last seen leaving a resort hotel on the Gold Coast Highway at Mermaid Beach around 11.30pm on Friday.

It was believed he was headed to Surfers Paradise.

"Police hold concerns for his welfare as he has made no contact with his family and his disappearance is very out of character," the statement said.

Roach was last seen wearing a white Crusaders rugby jersey with blue jeans and black sneakers. He is Maori and is approximately 180cm tall with a shaved head and a tattoo on his right upper arm.

He was also carrying a black bumbag.

Palmer said she was supporting her mother from Christchurch, where she was house-sitting for the couple.

She described her stepdad as a friendly guy and said the disappearance was entirely out of character.

"He's a real family guy. He wouldn't drink or go out very often, he's just really family orientated."