Potosí Silver Mining Boom and Peak Output (1630s)

Timeline

1. 1630–1636Potosí silver mines (Cerro Rico) · Potosí DepartmentIn the early 1630s, the amalgamation process (patio process) became fully established in the Potosí mining district, significantly improving silver recovery from low-grade ore. Relying on a steady mercury supply from the Huancavelica mercury mines, Potosí maintained a high annual silver output of about 7 to 9 million pesos in the 1630s, one of the core sources of the Spanish royal treasury.
2. 1630–1640Potosí and surrounding Andean regions · Andean regionThe mita system forced Andean Indians to rotate through service in the mines and smelting works, with about 13,000 forced laborers working each year under extremely harsh conditions. Sustained high-intensity mining in the 1630s accelerated indigenous death and flight, causing villages around the mining district to decline sharply; the colonial authorities were forced to expand the conscription area and rely on African slaves and hired workers (mingaos) to supplement the labor force.
3. 1630–1640Lima–Seville Atlantic route · Transatlantic trade networkSilver coins minted at the Potosí Mint (Real de a Ocho, or 'piece of eight') were shipped from Lima along the Callao–Panama–Seville route to Europe, while some silver flowed into China and Asian markets via the Pacific Manila galleon route. Silver circulation in the 1630s further deepened the global price revolution and spurred the expansion of Eurasian trade.