By Barbara Kollmeyer MADRID (MarketWatch) -- Gold futures fell in European trading hours on Thursday, after the prior day's bond-swap move by the Federal Reserve, but also its concerns about economic growth. Futures for December delivery GC1Z -1.85% dropped $35.80 to $1,771.80 an ounce in electronic trading after closing out the regular session at $1,808.10 in New York. Platinum futures for October delivery PL1V -2.35% also fell sharply, off $44.20 to $1,744 an ounce. December silver SI1Z -2.72% fell $1,12 to $39.38 an ounce. The December copper contract HG1Z -3.59% dropped 13 cents to $3.63 a pound.

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