Copper rises to 9-year high

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    Copper prices advanced to their highest level in nearly nine years on Tuesday, boosted by optimism about a global economic recovery that bodes well for metal demand while supply is expected to remain tight.

    Benchmark copper on the London Metal Exchange rose as much as 0.5 percent to $8,437 a ton in early Asian trading hours, rising for a third straight session to its highest since May 2012.

    The metal, often used as a gauge for global economic health, was up as much as 9.4 percent from its Feb. 2 low of $7,712 a ton.

    A weak US dollar also helped boost the appeal of greenback-priced copper.