DENVER, CO — U.S. mines are discarding billions of dollars’ worth of rare earths and other critical minerals every year, according to new research from the Colorado School of Mines. The findings suggest that tailings — long treated as an environmental liability — could instead be a domestic treasure trove capable of displacing imports and reshaping supply chains.
The study analyzed annual production data from U.S. metal mines and paired it with geochemical surveys of 70 minerals. Researchers concluded that if even 1% of unrecovered byproducts were reclaimed, it would be enough to meet U.S. demand for most critical minerals — from cobalt and gallium to germanium and rare earths like neodymium. Only platinum and palladium would remain short.
Rare Earths in U.S. Tailings: An Untapped Resource
The scale is striking. Less than 10% recovery of discarded cobalt would cover the entire U.S. electric vehicle battery market. A fraction of germanium recovery — under 1% — could meet all domestic needs in fiber optics and infrared systems. These minerals are currently lost as waste in gold, copper, zinc, and nickel mining operations.
“Metals such as cobalt, lithium, gallium, and rare earth elements like neodymium and yttrium are discarded as tailings,” said Elizabeth Holley, the study’s lead researcher. “The challenge lies in recovery. We need more research, development, and policy support to make it feasible.”
Earlier Skillings coverage on cobalt pricing volatility underscores how dependent U.S. manufacturers remain on fragile global supply chains dominated by China and the Democratic Republic of Congo.
Economic Value Lost to Imports
The U.S. imported more than $320 million of cobalt in 2024, according to the U.S. Geological Survey, along with significant volumes of gallium, germanium, and rare earth oxides. All of these already exist in domestic mine waste streams.
Reclaiming even a portion would add a secondary revenue channel for miners, while reducing national import bills. “The novelty of this study is its mathematical treatment of new datasets,” said Frances Wall, mineralogist at the University of Exeter. “It was surprising to see how little recovery would be needed to meet raw material requirements.”
For operators, the economics are twofold: tailings storage is a cost center requiring decades of monitoring, while byproduct recovery could convert those liabilities into saleable concentrates.
Incentives and Infrastructure Still Missing
The bottleneck is investment. Retrofitting existing circuits or building new recovery plants requires capital that current mineral prices do not justify. “Although these elements are needed, their market value may not be sufficient to motivate operators to invest without the right policies in place,” Holley said.
Industry observers note that tax incentives or guaranteed offtake agreements — similar to those in the Inflation Reduction Act’s battery provisions — may be required to shift the cost-benefit calculation.
Expert Perspectives
- Frances Wall, University of Exeter: “Even if potential is there, recovering byproduct elements from complex ore bodies is not straightforward. They may occur in multiple minerals at very low grades.”
- Colin Church, IOM3 (London): “There is significant value in U.S. mining waste, but commercial, chemical, and environmental barriers remain formidable.”
Skillings Analysis
- Value Leakage: U.S. mines are discarding billions in critical minerals annually — a major missed opportunity.
- Economic Trigger: Federal intervention, not just market forces, will determine whether byproduct recovery is viable.
- First Movers: Companies that pioneer pilot projects could secure long-term supply agreements and reputational advantage in ESG reporting.
Outlook: From Waste to Wealth
As demand for EVs, clean energy, and advanced electronics accelerates into the 2030s, the business case for byproduct recovery will strengthen. If incentives align, U.S. mining firms may one day see tailings ponds not as liabilities, but as strategic profit centers.
For now, billions remain buried in waste — waiting to be reclaimed.
