BUZZ-Antofagasta: Near 6-yr lows after cutting production forecast

** Copper miner's shares down 2 pct, second-largest loser on FTSE 100 after cutting its FY production guidance and saying H1 production fell 12.9 pct

** Co sees production of 665,000 tonnes in 2015, down from 695,000 tonnes earlier; production guidance had also been cut in April

** Stock near 6-yr lows as copper prices have also weighed in recent months, top loser on the Stoxx 600 Basic Resources Index

** Copper prices hit 6-yr lows on Monday, but jumped on Wednesday as short sellers rushed to cover their positions

** Numis -- rated 5 stars for recommendation accuracy on co, according to Starmine -- says stock trading at "pricey" valuation; stock is at 18.7 pct premium to its peers' median 12 mth forward P/E ratio according to ThomsonReuters data (venkateshasoumithri.mamidipudi.thomsonreuters.com@reuters.net)