Metals and energy prices closed lower across the board Tuesday, while crop prices were mixed.
The actively traded December contract for gold fell $4.80 to $1,324.80 an ounce. September silver lost 18.4 cents to $19.68 an ounce. Copper, platinum and palladium also fell.
Copper for September delivery lost 6.55 cents at $3.0420 a pound. October platinum fell $5.20 to $1,437.50 an ounce and September palladium fell $16 to $728.65 an ounce.
Crude oil fell to the lowest price in four weeks as traders wait for an updated policy statement from the Federal Reserve Wednesday and other key economic news, including the government's monthly employment report on Friday.
Benchmark oil for September delivery fell $1.47 to finish at $103.08 per barrel on the New York Mercantile Exchange.
In other energy trading, wholesale gasoline rose 1 cent to finish at $3.02 a gallon, heating oil fell 1 cent to end at $3.01 a gallon and natural gas fell 4 cents to finish at $3.43 per 1,000 cubic feet.
In agricultural futures trading, December corn rose 4.25 cents to $4.775 a bushel. September wheat rose 3.75 cents to $6.5525 a bushel and November soybeans fell 17 cents to $12.03 a bushel.