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July 21 (Reuters) - Canadian union Unifor said on Wednesday miner Rio Tinto has been served with a 72-hour strike notice after nearly seven weeks of unproductive negotiations over proposed changes to workers' retirement income and benefit levels.
The union said it is seeking better retirement security for younger workers by moving newer employees from the company's Defined Contribution plan to a Defined Benefit plan.
Negotiations are also focused on a backlog of more than 300 grievances and the company's refusal to hire full-time workers leading to an overreliance on temporary employees, Unifor said.
Rio Tinto did not immediately respond to Reuters request for comment.
Unifor says it represents about 900 workers at the company's aluminum smelting plant in Kitimat and power generating facility in Kemano. (Reporting by Sabahatjahan Contractor in Bengaluru; Editing by Subhranshu Sahu)