Southern Copper sits at the bottom of the global copper cost curve, which has kept it profitable through every downturn. Byproduct sales of molybdenum, zinc and silver from the same ore cut its net cost to 5 cents a pound last quarter. Over 21 years its worst net margin was +12.7%, while Freeport-McMoRan's was -82.7% in 2015; when prices fall, higher-cost mines slip into losses while Southern Copper stays above the line. x.com x.comÂ




