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Gunnison Copper is restarting copper production at its Johnson Camp mine in Arizona, which had been inactive since 2010. The mine is collaborating with Rio Tinto's subsidiary Nuton, employing microorganisms and sulfuric acid to extract copper from previously unprofitable ores.

This revival is part of a broader resurgence in Arizona's copper mining sector, driven by advancements in extraction techniques and increased demand for copper, crucial for electrical manufacturing. The project reflects a renewed interest in older mines in the region as the U.S. seeks to enhance its raw materials production.