Michael Widmer, an analyst at BNP Paribas, said that he expected the supply and demand relationship of copper concentrate market to be roughly balanced in 2009 and 2010. But if production of mines increased while the demand for refined copper was sluggish, the refined copper market would show an excess of at least 460,000 tons next year. http://www.gdindustry.com.cn/news/index.php?id=1577