High-flying gold and silver took a staggering hit in overnight trading with the precious metals losing roughly $6 trillion in just 30 minutes — as oil prices surge over fears over Iran. Gold tumbled back after hitting a new record at $5,595.47 an ounce as investors rushed to assets deemed safe, including silver, which reached its own record of $120.44 an ounce. The dollar steadied after losing ground most of this week. Gold declined more than five per cent and silver plunged more than eight per cent, while copper and nickel prices also fell, as traders reassessed the market. “The...