Freeport-McMoRan (FCX), the leading US-based copper miner (DIA), is having a tough year. The stock has lost 27.7% YTD (year-to-date) based on the closing prices on September 12. Other copper miners are also feeling the heat. Copper is caught in the US-China trade war. Copper prices are hovering near $6,000 per metric ton. In June, copper rose past $7,200 per metric ton to a four-year high.