Over history, gold and silver coins have been major trade darlings, and can still spur investor frenzy depending on how they're faring in markets. But as industries and economies deepen their dependence on critical minerals, these metals appear to be becoming as valuable as any commodity or currency.

Last week, Ukraine President Volodymyr Zelenskyy aimed to sign a minerals deal with the U.S. in hopes of securing longer-term support during the war against Russia. But the Oval Office meeting with …