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A miner piles salt to drain and cure on the edge of Bolivia's Salar de Uyuni, the world's largest salt flat. A fifty kilo bag sells for three bolivianos, about fifty cents.

The Solution: Bolivia’s Lithium Dreams

The 4,086-square-mile Salar de Uyuni is remote, flat as a billiard table, twice the size of Rhode Island—and it hides a great treasure. The billions of gallons of mineral-rich brine just below its crystalline surface hold perhaps half the world’s supply of lithium.