The gold markets are on edge, with trade between Switzerland and the United States likely to remain frozen until the Trump administration issues a new policy that clarifies whether imports of gold bars will be hit with tariffs.

Prices for the precious metal surged in New York trading to as much as $US3534.10 an ounce on Friday (Saturday AEST) after a US government agency stunned the market by ruling that 100-ounce and one-kilogram bullion bars would be subject to duties.

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