COLUMN-Copper concentrates tightness threatens benchmark pricing: Andy Home <!-- no image --> <div>The copper market may be stuck in a well-worn trading range but there is plenty of action unfolding in the mine concentrates segment of the copper supply chain.<div class="feedflare"> <a href="http://feeds.reuters.com/~ff/reuters/UKBankingFinancial?a=1VjPCYUmDKc:Gm3IZAMLh8A:yIl2AUoC8zA"><img src="http://feeds.feedburner.com/~ff/reuters/UKBankingFinancial?d=yIl2AUoC8zA" border="0"></a> <a href="http://feeds.reuters.com/~ff/reuters/UKBankingFinancial?a=1VjPCYUmDKc:Gm3IZAMLh8A:V_sGLiPBpWU"><img src="http://feeds.feedburner.com/~ff/reuters/UKBankingFinancial?i=1VjPCYUmDKc:Gm3IZAMLh8A:V_sGLiPBpWU" border="0"></a> <a href="http://feeds.reuters.com/~ff/reuters/UKBankingFinancial?a=1VjPCYUmDKc:Gm3IZAMLh8A:F7zBnMyn0Lo"><img src="http://feeds.feedburner.com/~ff/reuters/UKBankingFinancial?i=1VjPCYUmDKc:Gm3IZAMLh8A:F7zBnMyn0Lo" border="0"></a> </div><img src="http://feeds.feedburner.com/~r/reuters/UKBankingFinancial/~4/1VjPCYUmDKc" height="1" width="1" alt=""></div> Posted by Reuters