Since September 2013, the tension between villagers and Tungkum Co. Ltd., the mine operator, flared up when the villagers barricaded the mine entrance, blocking trucks, each of which normally carries 15 tons of cyanide waste, from passing through the villages.   The villagers from six villages of Khao Luang district of the northeastern province of Loei claims that throughout 12 years of mining operations, they have suffered numerous environmental problems allegedly caused by the mine.