* Holdings in biggest silver ETF fell 2 percent Monday * Heavy outflows in gold ETFs could pressure silver * Silver ETF holdings down only 1 percent year to date By Frank Tang NEW YORK, June 25 (Reuters) - Holdings of the world's largest silver-backed exchange-traded funds have fallen their most in a year to levels last seen in December, sparking fears that mom-and-pop investors have started to unwind investments after last week's rout. The world's largest silver ETF, the iShares Silver Trust , on Monday posted a 192-tonne, or nearly 2 percent, decline to 9,882 tonnes, its biggest...
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