Argentina, Brazil, Chile and Peru have signed a cooperative strategic-minerals pact while Argentina and Chile advance their revived 1997 Mining Integration and Complementation Treaty for cross-border mining. The treaty framework could unlock more than $20.7 billion in investment and add 540,000 metric tons to annual copper production by enabling Argentine projects to access Chilean ports, infrastructure and suppliers. Brazil is coordinating regional supply-chain studies with CAF, the Development Bank of Latin America and the Caribbean, while Peru’s mining associations are participating in discussions on a common strategy. The initiative comes as the United States and European Union seek to reduce reliance on China’s dominant mineral-processing industry, although implementation could face economic, regulatory and social obstacles. An earlier account reported an Aug. 28 declaration involving Bolivia rather than Brazil, creating a discrepancy over the pact’s membership.