Gold edged higher on Monday in Europe, gaining ground as a weaker dollar and further stock market weakness made it attractive as a safe haven investment.Spot gold rose to $425.40/426.20 a troy ounce up from New York's late quote on Friday of $424.60/425.40. Silver gained to $7.00/7.03 an ounce from $6.99/7.02. Platinum slipped back to $860.00/865.00 versus $861.00/865.00.