conventional range, despite using a conservative upstream copper concentrate impact sourced from ecoinvent data. The rougher concentrate scenario, at 3.3 kg CO₂e/kg Cu, represents a reduction of roughly 40–60% against the typical Arizona open-pit conventional footprint and sits well below the ICA global average. The RACER process eliminates transport, smelting, and refining of the incumbent route entirely, which is estimated to be 2.3–4.0 kg CO₂e/kg Cu for an Arizona mine and replaces them with ambient-temperature electrochemistry powered by renewable electricity.2,4,5 The result is that for the processing portion of the supply chain, emissions are reduced to 0.92 kg CO₂e/kg. Peru is the world’s second-largest copper producer, and the host country for this conference is also one of the most compelling illustrations of why social license has become the binding constraint on copper supply. Peruvian operations climate change impact is estimated at 5.0–7.5 kg CO₂e/kg Cu for open-pit mines and 4.0–6.5 kg CO₂e/kg Cu underground, reflecting comparable ore grades, similar transcontinental shipping distances, and the same dependence on coal-heavy Asian smelters as Arizona.2 Thus there is similar opportunity for RACER to significantly improve climate change impact of copper processing for Peruvian mines. What distinguishes Peru from Arizona and indeed other copper mining geographies is the intensity of the social license challenge: Peruvian copper development has faced a series of high-profile project suspensions and community-driven shutdowns at operations including Tia Maria, Conga, and Las Bambas, driven substantially by concerns about water use, tailings management, and AMD risk in Andean watersheds that serve as the primary freshwater source for downstream communities.6 These are precisely the liabilities that the RACER bulk sulfide configuration is designed to eliminate. For Peruvian project developers, the combination of NAG tailings, reduced water consumption from the elimination of smelting and concentrate transport, and a demonstrably lower climate change footprint represents a fundamentally different social license proposition—one that addresses the specific, technically-grounded objections that have stalled billions of dollars of copper investment in the country alone. 7. Conclusion Still Bright’s RACER technology presents a compelling, data-supported pathway to address the copper industry’s twin crises of demand and social license. Preliminary LCA results confirm that RACER applied to rougher concentrate achieves a 30% reduction in climate change impact, 80% reduction in water usage, and 50% reduction in acidification relative to the copper concentrate baseline, driven principally by the elimination of upstream processing steps and an increase in total copper captured from the ore body. The impact compared to conventional pyrometallurgical smelting routes is even more promising, with reduction in climate change impact up to 55% for a typical mine profile in Peru, and up to 60% for a typical mine profile in Arizona. The potential to deploy RACER to enable production of a bulk sulfide concentrate represents a paradigm shift in how mining waste is conceptualized. By converting sulfide-bearing ore into a process input rather than a long-term liability, RACER transforms the mine from a source of
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