Mr Gibson said they met with staff yesterday morning to inform them of the situation. They would be assessing the situation during the next few days, including looking at whether it was viable to restart production while the business was on the market.
"We will be making that decision in the next short while."
He said while it was always a potentially difficult situation, he thought staff understood where the receivers were coming from.
"The company doesn't have the resources to continue to pay them at the moment."
Mr Gibson said staff would be paid on Tuesday for the period they had worked.
First Union general secretary Robert Reid described the news as "devastating".
The union represents about two-thirds of the staff and plan to meet with them on Monday to work out what they could do.
He said staff had been worried about the future of their jobs for the past six months at least - but that wouldn't lessen the blow.
"There will not be surprise, but there will be shock."
He said in the past weeks staff had been asked to take holidays and there were only a small number at work when the receivers went in yesterday.
While the workers hadn't yet lost their jobs, Mr Reid said if they were to, it would be "very, very difficult" for them to find work.
"It would be a devastating blow to those workers and to the community as well," he said.
"The union's number one priority is to do what it can to keep the mill going and to keep people in work. We will be talking to the new mayor of Rotorua and local MPs about the situation."
There was no answer when the Rotorua Daily Post called Tachikawa for comment late yesterday afternoon.