Billion ounces of silver traded in London on Monday – LBMA

* 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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