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Hélène Nguemgaing

Hélène Nguemgaing

The Conversation

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The missing link in America’s critical minerals push isn’t mining – it’s processing expertise

The missing link in America’s critical minerals push isn’t mining – it’s processing expertise

America was once the global leader in rare earth element production, but as processing moved to China, the US lost capacity and expertise. It can get...

11.05.2026 9

The Conversation

Hélène Nguemgaing

America’s next big critical minerals source could be coal mine pollution – if we can agree on who owns it

Coal mines are notorious sources of acid mine drainage, but the orange sludge that threatens water supplies and wildlife also contains valuable rare...

22.01.2026 10

The Conversation

Hélène Nguemgaing

America’s next big clean energy resource could come from coal mine pollution – if we can agree on who owns it

Coal mines are notorious sources of acid mine drainage, but the orange sludge that threatens water supplies and wildlife also contains valuable rare...

21.01.2026 10

The Conversation

Hélène Nguemgaing