BUZZ-Miners: low volumes and long-only sellers exacerbating slump

** Mining sector suffers one of its worst days YTD, with traders citing a combination of low volumes and long-only selling adding to already negative sentiment over the continuing slide in commodity prices

** FTSE 350 Mining index (Jakarta: ^JKMING - news) hits 52-week low, down 4 pct

** Stoxx 600 Basic Resources down 3.4 pct, third worst day YTD

** Benchmark Bloomberg Commodity index at 13-year lows. Chart: http://link.reuters.com/reb35w

** Bearish BHP Billiton production report cited as adding to move lower in commodities on Wednesday

** Light (Other OTC: LGSXY - news) volumes in equities generally exacerbating moves - mining stocks struggling to break their daily average volumes despite significant falls

** Trader at a leading investment bank says long onlies remain sellers of materials stocks against hedge funds that remain skewed to buy

(RM (LSE: RM.L - news) : alasdair.pal.thomsonreuters.com@reuters.net)