A large contingent of police, many in riot gear, descended on the Mormont site in La Sarraz in the western canton of Vaud early Tuesday, asking the some 200 activists to leave or be removed by force.
The activists set up camp at the site in October, warning of the environmental and ecological consequences of Lafarge-Holcim’s plans to expand the quarry.
The company and the La Sarraz municipality had filed legal petitions to remove the activists, and the police operation came after the protesters’ legal appeals were rejected.
The move to clear the outer limits of the camp went off peacefully, but as the officers went towards a farmhouse at the centre, some protesters threw rocks and threw fireworks, an AFP photographer said.
“It is a high-anxiety situation. But we want to stick it out as long as possible,” one of the demonstrators told the ATS-Keystone news agency shortly before being evacuated by police.
The regional police said one police officer had been slightly wounded but none of the activists were injured.
By evening, police had detained 29 people, 12 of whom were taken into custody in nearby Lausanne.
A number of the activists remained up in trees or on the farmhouse roof, singing and shouting slogans against LafargeHolcim.