Aboriginal children were more likely to die at residential school than non-Aboriginal children. The children were often buried in unmarked graves. According to the Truth and Reconciliation Commission, 3200 students died in residential schools from 1867-2000.
Source: Marlene Leung. “Aboriginal children at residential school often buried in unmarked graves, report reveals.” December 15, 2015. CTV News. https://www.ctvnews.ca/mobile/canada/aboriginal-children-at-residential-schools-often-buried-in-unmarked-graves-report-reveals-1.2701373