BUZZ-Copper producers: Copper prices down
** Shares of copper producers down on Friday as prices for the metal fall
** Copper on track for its sixth week of declines, weighed down by stronger dollar and concerns about the outlook for demand from top consumer China
** Three-month copper on the London Metal Exchange traded 2 pct lower at $5,551 a tonne in official rings
** HudBay Minerals Inc shares down 4.9 pct at C$9.19, First Quantum Minerals Ltd down 7.8 pct at C$13.05, Teck Resources Ltd down 2.6 pct at C$15.57, Freeport-McMoRan Inc down 2.9 pct at $19.43
** U.S.-listed shares of Rio Tinto plc down 3.4 pct at $43.36, BHP Billiton Ltd down 2.8 pct at $45.99, Vale SA down 7.2 pct at $8.06
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