Freeport-McMoRan lead a group of copper stocks higher on ... Benchmark Minerals wrote on Feb. 3 that the U.S. has a trade surplus in copper ore, concentrates and scrap, with 900 kilotons exported ...

lead at 590 Fah ... and 64 pounds of copper and 88 pounds of ground calamine (zinc ore) are thc proportions of each charge. When a heat of twelve hours is completed, the crucibles are taken ...

With the processing of ore an unprofitable endeavor in China and concentrates ... and China Minmetals Corp., a producer of copper, lead and zinc. Red metal scrap itself has enjoyed a strong ...