LME copper only gets small bounce on news BHP Billiton (BHP.AU) Cerro Colorado mine workers have voted in favor of strike, given this was well flagged and given size of mine, says trader; mid-tier mine Cerro Colorado produced just over 90,000 tons last year. "The market is looking for direction at the moment so this could be the news that pushes it higher. But it's very quiet in Asia at present," trader says. LME 3-month copper last at $5,690/ton, +$51 on Tuesday PM kerb.