Potosí Silver Mining System

Timeline

1. 1651–1653Cerro Rico mining district · Potosí ProvinceIn the early 1650s, the Potosí mining district still relied on the mita system to conscript indigenous laborers. The provinces of the Viceroyalty of Peru were required to send roughly 13,000 or more mita workers to the mines each year, but actual attendance had fallen sharply due to the collapse of the indigenous population. Mine owners began redeeming their labor quotas with money (indio de faltriquera), and a degree of monetization emerged within the system.
2. 1653–1657Potosí refining mill district (ingenios) · Potosí ProvinceOver a hundred water-powered mills (ingenios) were built along the Ribas River outside Potosí, mixing crushed ore with mercury to extract silver. The required mercury ore was transported over long distances from the Huancavelica mines, forming an interdependent production chain between the two mining districts. During this period mercury consumption correlated positively with silver output; historical records show annual silver production of roughly 2 to 3 million pesos.
3. 1657–1660Royal Mint of Potosí (Casa de la Moneda de Potosí) · Potosí ProvinceThe mint cast the refined crude silver into standard-weight macuquina coins, which were loaded at the ports of Lima and Buenos Aires and ultimately shipped to Seville in Spain. The Potosí eight-real peso (piece of eight), prized for its stable purity, became the principal circulating coin of global trade in the 16th–17th centuries, circulating widely in European, Middle Eastern, and East Asian markets.