https://bbabsalmines.com/research.html Independent, evidence led analysis of critical minerals, refining capacity, method, markets and policy. en https://bbabsalmines.com/study-us-refining.html https://bbabsalmines.com/study-us-refining.html Fri, 07 Aug 2026 09:00:00 GMT Ten years of United States Geological Survey data on American copper refinery output, net import reliance, and where the world's refining capacity sits.