On January 1, 2012, Rio Tinto’s aluminium subsidiary Alcan locked out 780 members of United Steelworkers at its smelter and refinery in Alma, Québec. The company refuses to negotiate limits on contract work.
See http://www.minesandcommunities.org/article.php?a=11463&l=1.
See also Rio Tinto’s lockout of Alma workers looks set to drag on,
http://www.mineweb.com/mineweb/view/mineweb/en/page504?oid=144916&sn=Detail&pid=92730.