Porco (caldera)

19°50′S 66°00′W / 19.833°S 66.000°W / -19.833; -66.000^[1] Porco caldera is a caldera in Bolivia which contains a major deposit of lead, silver, tin, and zinc ore. This caldera was formed by a volcanic eruption 12 million years ago in the Bolivian Cordillera Oriental. Subsequent to the caldera collapse, volcanic intrusions occurred as many as 3 million years after the caldera formation.

Ore deposits form veins within the caldera infill. These ores were mined for silver as early as the Inca period; more recently, Porco is the site of zinc mining.