CME Group Hikes Comex Gold--Silver--Copper Margins

September 23, 2011 5:44 PM EDT

The CME Group, which runs the the New York Mercantile Exchange, on Friday raised the margin on Comex gold futures by 21.48 percent and the margin on Comex silver margins by 15.63 percent.copper by 18%. Mystery solved.

CME increased the amount of money that parties trading gold and silver futures on the Comex division of the New York Mercantile Exchange must keep as good-faith deposits because of volatility.