PRECIOUS-Gold, silver slide to seven-month lows as dollar climbs

* Investors retreat from physical gold holdings * Opportunity cost for gold set to rise further (Updates prices, headline; adds comment, second byline, NEW YORK to dateline) By Renita D. Young and Pratima Desai NEW YORK/LONDON, July 13 (Reuters) – Gold and silver prices slid to seven-month lows on […]

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