UPDATE 2-Miner Anglo warns of up to $4 bln writedown on iron ore and coal assets
* Sees non-cash items for Minas Rio and some Australia coal assets
* Charge to be taken in first-half results due July 24
* Q2 diamond output down 6 pct, copper production off 5 pct
* Shares down 0.5 pct, not far from 12-year low (Adds analyst comment, share price)
By Eric Onstad and Clara Denina
LONDON, July 16 (Reuters) - Mining group Anglo American has warned of a second multi-billion dollar writedown this year on its coal and iron ore assets, demonstrating the growing impact of sliding commodity prices.
The charge of between $3 billion and $4 billion flagged on Thursday, to be taken in its first-half results, comes on top of a $3.9 billion writedown Anglo took for similar reasons in February, when it also posted a 25 percent drop in underlying operating profit for 2014.
Anglo, the fifth-biggest diversified global mining group by stock market capitalisation, is not alone in feeling the pinch of tumbling commodity prices.
BHP Billiton said on Wednesday it will take a $2 billion impairment on its U.S. shale operations, the third writedown in three years. Continuación...