Gold futures tumbled by more than $90 on Monday, deepening their descent after entering bear-market territory last week, while prices for industrial metal copper also slumped following economic data from China that fell short of expectations. Gold for June delivery /quotes/zigman/647778 GCM3 -5.46% tumbled $90.20, or 6%, to $1,411.00 an ounce. Gold last week lost 4.7%. The losses roughly matched gold’s heavy drop on Friday, when it lost $63.50, or 4.1%, to $1,501.40 an ounce on the Comex division of the New York Mercantile Exchange. Friday’s settlement price marked a 20.5% drop for the most-active contract from the ... (full story)