<![CDATA[This study analyzes the reconstruction of PT Timah Tbk's tin downstreaming policy in supporting the National Strategic Project (PSN) and national energy-mineral resilience. Indonesia, as one of the world's largest tin producers and reserves, positions tin as a strategic and critical resource with geoeconomic, geopolitical, and constitutional value. Based on Article 33 paragraph (3) of the 1945 Constitution of the Republic of Indonesia and the interpretation of the Constitutional Court, the state has an obligation to manage natural resources directly for the greatest prosperity of the people, one of which is realized through the role of State-Owned Enterprises, especially PT Timah Tbk. This study uses a qualitative method with a library research approach to laws and regulations, court decisions, government policies, official documents, PT Timah Tbk reports, and relevant scientific literature. The results of the study indicate that the determination of PT Timah Tbk's tin downstreaming as part of the PSN has legal, economic, and strategic urgency. Legally, the PSN status functions as a legal instrument to address normative conflicts and legal uncertainty due to changes in marine spatial planning policies. Economically, downstreaming encourages increased added value, strengthening downstream industries, and sustainable economic growth. Strategically, tin downstreaming directly contributes to national mineral energy security by strengthening supply, developing the technology and renewable energy industries, and reducing dependence on raw material exports. This research confirms that tin downstreaming as a National Strategic Project (PSN) is not merely an economic policy, but rather a constitutional necessity and a strategic instrument for the state in realizing natural resource sovereignty, sustainable development, and national mineral energy security.]]>
