AMBOHITSY HAUT, Madagascar Etsizakay, 40, stood amid the rugged knolls of his village, Ambohitsy Haut, and pointed right. “That’s where my brother is buried,” he said. “There ahead are my grandparents’ tombs.” Then, gesturing left toward a simple stone mound: “That’s my 4-year-old son.” What also lies buried across this uneven land: graphite, or manjarano […]