Relating to mineral deposits or geological formations created by hot, mineral-rich fluids near Earth's surface; also relating to moderate heat.
From epi- 'upon' or 'at' + thermal (from Greek therme 'heat'). Used in geology to describe hydrothermal deposits.
Gold miners love epithermal deposits because they're the zones where hot springs left behind treasure—many famous gold rushes happened near epithermal regions!
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