Hundreds of workers at a joint Chinese-Serbian copper mine in Bor, in eastern Serbia, blocked access to the facility on January 26 to protest for higher wages and a new collective bargaining agreement with the mine's Chinese majority owners.
The demonstrators blocked four entrance gates to the mining and smelting complex.
"We are only blocking heavy trucks -- we let in the ambulance, firefighters, and police. Anyone can walk by foot and get to work," Dragan Elek, from the smelters trade union organization, told RFE/RL.
Chinese Zijin Copper bought around two-thirds of the Bor mining facility from the Serbian state in 2018 and employs some 6,200 people to exploit copper, gold, and other ore deposits in eastern Serbia.
A similar protest was staged earlier this month.
Workers are demanding the 14.3-percent pay rise that was proposed by the tripartite Socio-Economic Council representing labor, management, and the Serbian government. They also want a new collective agreement.
"Primarily, we want to preserve our budgets and our dignity," Miodrag Milic, one of the protesting workers, told RFE/RL.
The Zijin Copper company issued a statement pledging in 2023 to increase wages by 10 percent.
The Chinese Bor operations have already faced legal challenges based on accusations of noncompliance with environmental standards.