THUNDER BAY — The largest union at the Resolute pulp and paper mill in the city wants assurances about a long-term wood supply after ownership is transferred to a US private equity firm. In announcing the sale of the mill to an affiliate of Atlas Holdings for about US$ 220 million, Resolute said Tuesday that the two parties will also enter into a long-term wood chip and biomass supply agreement. Resolute, which will continue to operate three sawmills in the Northwest, will keep sending the mill the chips and biomass it needs to make pulp and paper. Company vice-president Seth Kursman declined to reveal the duration of that business agreement. …Stephen Boon, the northern area director for Unifor, which has 300 members at the pulp and paper mill, has some reservations about the longevity of the agreement.