London, Feb 12 (Bloomberg) Gold today declined to a five-week low as a stronger dollar curbed demand for the metal as an alternative investment. Gold fell 0.3 per cent to 1,643.18 dollar an ounce. Prices are down for a fourth day and reached 1,641.66 dollar, the lowest since January 4. Silver fell 0.8 per cent to 30.71 dollar an ounce. The US Dollar Index, a measure against six currencies, rose for a fifth day, reaching a one-month high.

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