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Rio Tinto's Kennecott Mine in Utah, the largest man-made excavation, is vital for U.S. copper and tellurium production, supplying 15-20% of the nation's copper demand and playing a key role in renewable technology. With a $1.5 billion expansion project underway to extend operations to 2032, the mine will also begin underground mining at North Rim Skarn by 2026, while implementing sustainability efforts such as transitioning to renewable diesel.