The richest, riskiest tin mine on Earth

DEEP in the jungle of North Kivu, a lawless province in the Democratic Republic of Congo, a new road is being cut through the canopy. As birds chirp, hand saws cut noisily through trees. Men with shovels dig out roots and flatten the ochre-red earth. A sturdy new log bridge crosses a stream. On it stands Boris Kamstra, a South African in a plaid shirt and bucket hat. “This is great road-building material,” he booms, gesturing at the stones.