Copper fell the most since October 2004, paring this year's 93% gain, and zinc posted the largest daily drop since at least 1989, according to a report on the website of Bloomberg.The 3-month copper on the London Metal Exchange fell as much as $760, or 9%, to $7,700 per tonne, and a close at the level would be the largest one-day loss since October 2004. The metal was traded at $8,000 per tonne as of 10:49 a.m. London time.Zinc lost as much as $450, or 12.3%, to $3,210 per tonne, the report said.Silver fell as much as 89 cents, or 6.2%, to $13.48 an ounce. Gold for immediate delivery fell as much as $25.94, or 3.6%, to $688.86 an ounce.
