The American-owned Cerro de Pasco Copper Corporation completes construction of a massive metallurgical smelter at La Oroya, Peru, expanding its extraction of copper, lead, and zinc from the high Andean plateaus. While the engineering achievement drastically increases Peru's export revenues, the smelter's toxic emissions blanket the surrounding mountains in heavy metals, devastating local agriculture and poisoning the local population. This expansion transforms Cerro de Pasco into a highly unionized, volatile hub of working-class militancy as indigenous miners adapt to industrial wage labor under foreign corporate oversight.

The environmental destruction and labor struggles of Cerro de Pasco deeply influence the Peruvian 'Indigenista' literary movement and vanguard poetry. Renowned poet César Vallejo, who closely observed the social fractures of mining towns, incorporates themes of indigenous exploitation, toxic environments, and corporate greed into his poetry. The smoky, metal-poisoned Andean sky becomes a powerful recurring symbol in Peruvian verse for the human and environmental costs of neo-colonial economic development.