Silver and gold prices are rising as investors seek out relatively stable assets while uncertainty continues about the Middle East and Japan's recovery.
Silver settled up 2.7 percent Monday while gold rose nearly 1 percent.
Commodities traders are concerned about global oil supply disruptions because of anti-government clashes in Libya and other parts of the Middle East and North Africa.
They also are monitoring Japan's ongoing struggles to recover from a March 11 earthquake and tsunami and the ensuing crisis at its stricken nuclear plants.
Both situations can affect demand for a broad range of commodities, from oil to corn.
Other metals and agriculture products are mixed while energy contracts are mostly higher.