Those prices rises have had "a significant impact on the company" globally and in Waihi, Grindlay said.
The price of gold price had risen 142 per cent over the past five years, to US$1,763.95 per ounce.
"We need to start reducing our costs now in order to keep the mine viable," Grindlay said.
The company said it would, where possible, be seeking to offer changes of jobs rather than redundancies.
Some staff were already being offered jobs at other Newmont sites globally.
In addition to job cuts, it expected to significantly scale back its exploration programme.
The cuts were part of a wider package of job cuts across all Newmont sites globally.
Staff at Newmont's four mines and regional headquarters in Australia had also been notified this week of likely redundancies.
Meanwhile, Solid Energy miners were marching on Parliament in Wellington this afternoon after the state-owned coal miner announced plans to trim its workforce by a quarter, in the face of slumping coal prices.
The miners would be appealing today for government assistance.