U.S. Gold Corp. (NASDAQ: USAU) stock jumped more than 120% Tuesday after the gold exploration company announced that it has internally updated the economics of the Copper King deposit to reflect the recent rise in gold prices.  Mine Development..

Copper prices on Wednesday surged to its highest level since July 2014 after China’s top copper producer was asked to halt production due to pollution issue.Benchmark copper on the London Metal Exchange hit a high of $7,210 a metric ton, its h..