Silver, trading near the cheapest relative to gold since 2008, may be set to grab more attention from investors. The 12-month moving average for silver coin sales by the U.S. Mint soared to the highest in March since data begins 1986. Spot prices climbed 11 percent last quarter, the best performance in more than three years. Gains against gold may be in store on silver investment and coin demand, according to Commerzbank AG.

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