Construction workers in Bolivia have stumbled upon a mass grave with the remains of hundreds of likely indigenous miners during the Spanish colonial era, a researcher said Saturday.

The workers found the remains this week as they started construction on a new building in the "El Minero" district of Potosi, located high up in the Andes. "We are talking about a common grave found at about 1.8 meters (5.9 feet), and the human remains are scattered over an area of four by four meters," said Sergio Fidel, a researcher at a museum belonging to Tomas Frias University.

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