METALS-London copper slips, stays on course for weekly gain

(Adds Shanghai closing prices, updates London prices) BEIJING, Dec 22 (Reuters) - London copper prices edged lower on Friday as the dollar strengthened slightly and wage agreements at mines in Chile eased concerns about supply disruptions in the world's top producer of the metal. A rising U.S. currency makes dollar-denominated commodities more expensive for non-U.S. firms but copper remains on course for a weekly gain of 2.7 percent and a close above $7,000 per tonne on the London Metal

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