Morenci Mine in Arizona, was the largest mine in United States, producing approximately 169.45 million metric tons per annum (mmtpa) of Run-of-Mine (ROM) and primarily produced copper (397.52 thousand tonnes) in 2021. The Morenci Mine is owned by Freeport-McMoRan Inc;Sumitomo Corp;Sumitomo Metal Mining Co Ltd, and is due to operate until 2045. The second largest mine with approximately 76.51 mmtpa of ROM, was the North Antelope Rochelle Mine located in Wyoming. The North Antelope Rochelle Mine is owned by Peabody Energy Corp, and is due to operate until 2047.
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