Over 500 Pre-Hispanic Obsidian Mine Shafts Uncovered in Central Mexico
Archaeologists working northeast of Teotihuacan in the Sierra of Central Mexico have found more than 500 pre-Hispanic obsidian mine shafts, and surplus heaps.
Las Navajas Coahuila De Zaragoza Columbian Mesoamerican Alejandro Pastrana Cruz Alliance Of The Aztecs Hispanic Mesoamerican
Source: ancient-origins.net