Rodolfo Illanes fell into the hands of the rioting miners while trying to persuade them to stop a road block they had created.
The incident, which occurred in the town of Panduro, La Paz, happened on Thursday, August 25, 2016, the News Agency of Nigeria (NAN) reports.
The deceased, Rodolfo Illanes, 56, was reportedly kidnapped by the miners while attempting to begin interaction with them over a road block.
He was beaten to death subsequently.
Romero condemned the killing of his colleague, terming the action as a “cowardly and brutal” murder.
The incidence brings the death toll in the crisis to a total of three, as two miners were reportedly killed a day before the death of the minister.
“Two miners were killed on Wednesday."
“Around 100 miners were detained after Thursday’s protests", he said.