Company requires a 15% cut in lumber production for the quarter.
US department of Commerce claims Canadian exporters underpriced uncoated groundwood paper by between 0 and 22.16%.
Has to make decisions on steel by April 11 and on aluminum by April 19.
Beijing faces complaints that a flood of Chinese aluminum, steel and other exports are being sold at unfairly low prices.
600,000 workers in the newspaper and commercial printing sectors are at risk.
Options include challenges under both NAFTA and at the World Trade Organization.
“We will not pay those tariffs and that is very clear,” says CEO Ed Bastian.
Prices are rising, making imports from sources in Europe and more attractive.
Victory in the latest trade battle will only be secured if Canada uses all of the weapons in its arsenal.
Preliminary anti-dumping duties expected average around 10%, added to previous levy.
Levies on Canadian softwood sent to the US currently range from three to 24%.
But situation could change in Quebec if prices fall during the end to the home construction season.
Also fears of anti-dumping duty on softwood, renegotiating NAFTA and a border tax.
Waiting to see the details of various punitive measures before calculating the aid amount.
German official says the US calculations contradicted WTO rules and were intended to protect US steelmakers.