Key TakeawaysShares of mining giant Freeport-McMoRan surged alongside an uptick in copper and gold prices.The announcement of an economic stimulus package in China helped to their highest level in more than two months.Gold prices are sitting at a record high following the Fed's first interest-rate cut and as other central banks around the world loosen monetary policy. Freeport-McMoRan (FCX) shares surged on Tuesday amid an increase in the prices of copper and gold, two of the main commodities produced by th ...