Not long ago, Dr. Copper was sick. Today the doctor is looking a lot healthier. It’s been a rough few years for copper. Since hitting all-time highs of US$10,250/metric tonne in February 2011, it has suffered nearly 6 years of tumbling prices. As shown in the graph below, copper fell 58 percent from its all-time highs to its lows in January 2016. But in the last year, the industrial metal’s fortunes have begun to reverse. Last year copper was up 17.4 percent, and in 2017 so far it’s up 8 percent to nearly $6,000/mT. It’s up 40 percent increase from...