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** Shares in London-listed global miners BHP, Rio , Anglo American and Glencore up 1-2 pct after Liberum raises rating on mining sector to "hold"
** All four stocks among top gainers on FTSE 100 and Stoxx 600 Basic Resources Index in decent volumes
** Liberum analysts say iron ore downside is largely priced in at BHP and Rio, while valuation sensitivity to long-run copper prices is skewed to the upside
** Analysts upgrade Rio, BHP and Glencore to "hold", keep Anglo at "sell" (firstname.lastname@example.org)