The Aberdeenshire-based plant is the global paper and packaging company's only non-integrated fine paper mill, and it produces 250,000 tonnes of uncoated freesheet paper annually.
It was announced today that a consultation process on strategic alternatives for the mill's future has begun.
The move, which is a further blow for the Scottish paper industry following the closure of Curtis Fine Papers earlier in the year, would see International Paper exit the UK paper manufacturing sector.
Tim Kelly, vice president and general manager of International Paper's European Papers business, said the company was looking to close the mill because it is "unprofitable and not financially viable".
Tony Burke, assistant general secretary of Unite, said: "This is another massive blow for papermaking in the UK. Our major concern is to see if it’s possible to save the mill and defend our member’s jobs in Scotland.
"The position in the paper and packaging industries is becoming critical as we currently have over 1,000 members there that are in consultation over closure or potential redundancy."
For more information see PrintWeek.
Threat to mill puts nearly 400 jobs at risk
Almost 400 jobs are at risk following paper manufacturing giant International Paper's announcement that it has entered into consultation with staff at its Inverurie mill in Scotland.