Underwater caves in Mexico preserve one of the world’s oldest ochre mines

A diver examines a rock pile thought to be an ancient navigational marker inside a 12,000-year-old ochre mine in Quintana Roo, Mexico. © CINDAQ.ORG

Crouching as she wound her way through a pinched underground corridor, a young woman grasped a torch in one hand, soot blackening the craggy ceiling above her. Guided by stacks of stones deeper and deeper in the darkness of the cave, she finally spied her prize: a blood-red vein of rock in the fire-lit wall. It would be 10,000 years before another pair of eyes saw it again.

Now the blood-red rock—a treasured crimson mineral known as ochre—has been found again, this time by underwater divers who were the first people in tens of centuries to return to these now-submerged caves. Scientists have confirmed that the site, now part of a coastal cave system in Quintana Roo, Mexico, is one of the Western Hemisphere’s oldest known ochre mining sites. Ochre, which was used for rock art, body decoration, tanning animal hides, and possibly medicine, was a prize miners would go to great lengths to obtain, from the jungles of Mesoamerica to the grasslands of Africa.

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