The plant, established by New Zealand Dairies Ltd, started production in September 2007.
Nutritek had a minority shareholding in it and now has Overseas Investment Office approval to take that shareholding to 100%. It had already entered into agreements which sees it holding 82%.
Yesterday, Nutritek's new chief executive, Jim Dwyer, along with a delegation from the company, toured the plant.
Mr Dwyer hoped to reach agreements to realise a 100% shareholding this month.
Plans to invest a further $100 million into the plant, which is running at full production and has orders for all it produces, were put on hold while a clear assessment could be made of the effects of the global financial crisis.
The further investment was to add value to the raw milk powder by manufacturing nutritional and clinical products to meet niche markets, particularly in Asia and the Pacific.
That was part of the reason for Mr Dwyer's visit to the plant yesterday as he produces a global strategy for Nutritek. Part of that strategy will be identifying potential markets for niche products.
"It is a fact-finding visit, to understand the issues we face," he said.
Mr Dwyer was adamant the additional investment would happen, although he could not say when.
During the visit, Mr Dwyer met milk suppliers, who have two years of a three-year contract still to run.
He said NZ Dairies was running smoothly with a strong management team, dedicated farmer suppliers and a skilled workforce.
"We are in a sound position and looking at plans for the future to strengthen our links with the Asia-Pacific region," he said.