The incident occurred on Friday, when a Boungou mine convoy got attacked near the rural commune of Nadiabonli.
"Six civilian deaths were reported and two injured," the military said in a statement on Saturday.
The convoy vehicles were attacked on the night from Thursday to Friday, after they left the Boungou mine along with other maintenance vehicles, to help a supply convoy that had several vehicles stuck in the mud. After maintenance work was completed, five cars were left behind the convoy without military escort.