Iwastheone shared this article from CBS News:
Experts and cave divers in Mexico’s Yucatan peninsula have found ocher mines that are some of the oldest on the continent. Ancient skeletons were found in the narrow, twisting labyrinths of now-submerged sinkhole caves… The discovery of remains of human-set fires, stacked mining debris, simple stone tools, navigational aids and digging sites suggest humans went…