TORONTO, Aug 22 (Reuters) - Rio Tinto expects

the labor dispute between the workers and the management of

Canada's two biggest rail networks will affect its ability to

receive raw materials at several sites across Canada and ship

products to customers in North America, the miner told Reuters

on Thursday.

Rio Tinto added that it has contingency plans in place to

minimize impact that includes trucking certain materials and

products and increasing use of its own rail network.