Copper Is Getting Slammed Rob WileApril 19, 2013 Copper futures are down more than 2.5 percent and are poised to see their largest decline in 16 months, Dow Jones' Francesca Freeman writes. The sell-off came after a report that Zambia, Africa's largest producer, resumed shipments after a two-week halt because of a railroad accident, she says. Investing.com Other commodities were mixed. Gold and oil were trading slightly higher, while natural gas was down.