"I have not met with them yet but I have told them to stay home until Monday at this stage."
The owner said the mill's fire response systems, and health and safety procedures were up to scratch.
"We have a pretty stringent set-up. The fire went up too quickly for our facilities to stop it though."
A Fire and Emergency New Zealand spokesman said there was no obvious cause of the blaze at this stage.
An investigator was at the scene last nightand returned this morning.
Taupo assistant area commander Richard Anastasi said when the first responders arrived from Taupo the main building was "almost totally involved in fire".
He it was a "tragedy" for the workers.
Anastasi said because the mill was rural, there was no reticulated water system at the site.
"We had to shuttle water from the nearest hydrant which was 20 minutes away, so we used four water trucks for that."
Anastasi said the priority was to save a few smaller structures around the main building, which the crews managed to do.