Silver futures gained more than 2% Friday, heading for their biggest monthly gain in 22 years as inflation worries and hopes for an economic recovery boosted the metal. Gold rose to three-month high as the dollar slipped. Silver for July delivery, the most active contract, gained 33 cents, or 2.2%, to $15.49 an ounce in early North American electronic trading. The front-month June contract stood at $15.42 an ounce. Silver has gained 25% this month, the biggest since April 1987. The metal has many industrial uses but is also seen as a hedge against a weaker dollar and inflation. Meanwhile, June gold rose $12.90, or 1.3%, to $974.40 an ounce. Gold has gained nearly 10% in month.

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