Producers of metals, grains and other raw materials fell as the U.S. dollar gained ahead of the Federal Reserve's rate decision.
The Fed is almost certain to hike interest rates, a generally bullish action for the national currency.
Dollar-sensitive gold futures fell 0.4% to $4291.60 a troy ounce, and are on the verge of bear-market territory, 19% below their January highs.
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