Government officials knew in the 1990s that mercury was visible in soil under the paper mill upstream from Grassy Narrows First Nation, but the people there did not find out until this week, the Star has learned. During the intervening years, as the residents of Grassy Narrows and scientists sounded the alarm that the neurotoxin was poisoning the fish and the people who eat it, government official after government official kept repeating that there was no ongoing source of mercury in the Wabigoon River that is the lifeblood of Grassy Narrows. …A confidential report, commissioned by the current owner of the mill, Domtar, and prepared in 2016 by an environmental consulting firm, tells a different story: the province knew decades ago that the site of the mill was contaminated with mercury. Today, the report says, it likely still is.