The mines that Rome had annexed from Carthage more than a century previously had been handed over to the publicani, who had proceeded to exploit them with their customary gusto. A single network of tunnels might spread for more than a hundred square miles, and provide upwards of forty thousand slaves with a living death. Over the pockmarked landscape there would invariably hang a pall of smog, belched out from the smelting furnaces through giant chimneys, and so heavy with chemicals that it burned the naked skin and turned it white. Birds would die if they flew through the fumes. As Roman
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