* CME raises Comex 5000 Silver Futures margins by 17.9%
* U.S. commodities regulator monitoring silver activity
* Billion ounces of silver traded in London on Monday – LBMA
* FACTBOX-How silver is traded (Adds graphics, updates prices)
Feb 2 (Reuters) – Silver slumped 8% on Tuesday as small investors turned their focus away from the metal, hastening a retreat from a rally to a near eight-year peak in the previous session fuelled by a social media-driven trading frenzy.
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