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Chilean authorities are investigating the sinkhole at Alcaparrosa, one of two underground operations that make up Ojos del Salado, which in turn is part of the Candelaria complex.

Lundin said Monday it had halted development work near the site, but that the sinkhole didn’t affect the community, workers or its annual output guidance. Still, analysts at BMO Capital Markets lowered their Candelaria production estimate to the midpoint of the guidance range.

The event is playing out as the mining industry lobbies against planned tax hikes in Chile and faces more onerous rules regarding the environment and local communities as part of a new constitution that will go to a popular vote next month. Lundin is looking into further expansions in Chile after recently spending $1 billion upgrading its operations there.

Company shares were down 6.1% at 10:41 a.m. in Toronto, the steepest decline among global rivals tracked by Bloomberg, with markets in Canada resuming after a public holiday Monday.

A photo of a circular hole of about 25 meters (82 feet) in diameter was posted on the Twitter account of geology and mining service, Sernageomin, which ordered work in the immediate area to stop as it evaluates the situation.

Candelaria produced 118,600 metric tons of copper last year, government data show. It’s indirectly owned by Lundin (80%) and Sumitomo (20%), with the former acquiring its stake from Freeport-McMoRan Inc. in 2014. Lundin Mining was founded by Swedish-Canadian billionaire Lukas Lundin, who died last week.

“Minera Ojos del Salado is carrying out technical analyzes and gathering external information to determine the causes of this event to update the information that has been provided to the authorities,” Lundin said in an emailed statement on Monday.