Police authorities said the miners were on the way to work when armed militants kidnapped them and took them to the nearby mountains.
Security forces dispatched to region and investigation launched.
A French humanitarian worker who was freed this week in Mali after four years in captivity has revealed she is a Muslim, French media reported on Friday.
The kidnapping took place while he was returning from the capital Ouagadougou, along the Namsiguia-Djibo axis where his body was found.
