It has been called one of the worst environmental disasters in Canadian history. Between 1962 and 1970, a mill in Dryden, Ontario dumped more than 9 metric tons of untreated inorganic mercury into the English and Wabigoon Rivers in Northwestern Ontario.
These waters had been a source of both food and jobs for the people of Asubpeeschoseewagong (Grassy Narrows) and neighbouring First Nations. Community members had worked as guides and as staff in the many commercial fishing lodges. When the mercury dumping was discovered, the commercial fishery was closed, cutting the people off from their most important source of income.
Even worse, it was discovered that many of the residents had greatly elevated levels of mercury in their bodies and were exhibiting signs of the neurological degeneration associated with mercury poisoning.