WELLINGTON (Dow Jones)--Gold prices edged higher in the Asian session Wednesday amid euro-zone uncertainty following Greece's surprise plan to have a referendum on the European bailout package and ahead of key meetings on either side of the Atlantic. At 0510 GMT, spot gold was up $2.90 at $1,722.80 a troy ounce, paring early losses after hitting a low of $1,714.10/oz. "Too many factors" are scaring away investors from building up long positions, Lee Cheong ...

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