Crowds attacked a minibus carrying Argentina’s president, Alberto Fernández, in the country’s Patagonia region.
Dozens of protesters gathered around Mr Fernández and threw stones and punched his vehicle outside a community centre in the southern province of Chubut.
The president was visiting an area devastated by forest fires, which have killed one person and injured others.
But the protest was against plans to resume open-pit mining in Chubut.
The demonstrators were angry at government proposals to allow large-scale projects to begin again in the region, which is rich in gold, silver and uranium, Clarín newspaper reported.
Haci recibieron alberto fernandez en lago puelo pic.twitter.com/vP95CROrn5
— jose luis (@luis2942_jose) March 13, 2021
Forest fires have blazed through Argentina’s Patagonia region in recent days, forcing people to evacuate the area and destroying at least 200 homes.
Some towns have suffered power outages and others have been left without a water supply.
The cause of the fires has yet to be established, but Argentina’s interior ministry has said it believes many were started intentionally.