The protesters are opposed to plans for an open cast mine near Douglas
Climate change protesters have dumped coal outside the headquarters of South Lanarkshire Council in Hamilton.
The demonstration was part of an ongoing campaign against plans for an open cast mine at Mainshill Wood near Douglas.
The protesters said they wanted to highlight the environmental and health impacts of open cast mining.
A spokeswoman for South Lanarkshire Council said there had been no disruption to council business.
Last week coal deliveries from the Glentaggart open cast mine in South Lanarkshire were disrupted after a conveyor belt on the site was found to be damaged.
A spokesman for the Mainshill Wood campaigners said he believed anonymous climate change activists were to blame for the sabotage.
The protest outside the council headquarters was the culmination of a week-long climate change camp event.
Anna Craig of the Camp for Climate Action Scotland said: "Coal means misery and death, not just for the thousands of people seriously affected by mining in South Lanarkshire but also in other disadvantaged communities around the world, who are being hit first and hardest by climate change."