RE:Lower Copper Prices TodayCopper prices are down to $3.29lb today. Lower copper prices could have an effect on the economic viability of the SGC project if copper prices drop below $3.25lb. Based on messages I've been reading on the SGC message board. The company is depending on higher copper prices to pick up the slack for struggling gold prices. The NPV of the SGC project is based on gold, silver, copper and zinc prices.