© U.S. Geological Survey
The quake was followed by more than a dozen aftershocks -- including one with a magnitude of 6.1.
the GFZ German Research Centre for Geosciences said, with local news media reporting some damage and minor landslides in areas near the epicenter.
Chile's interior ministry said in a statement that mining companies operating in the area had not reported any issues in the 2-1/2 hours since the initial quake. GFZ has reported several aftershocks of magnitudes between 5.5 and 6.2.
Chile is the world's largest copper producer and most of its large operations are in Antofagasta region, more than 300 km (180 miles) north of the quake's epicenter.
Miner Antofagasta Plc told Reuters that its operations at Los Pelambres, the closest large deposit to the epicenter, some 379 km (236 miles) in a straight line, had not been affected.
Patricio Elgueta, a union chief at state miner Codelco's El Salvador mine 200 km (120 miles) north, said operations continued as normal.
Mine facilities and other infrastructure in Chile are built to withstand large quakes.
The interior ministry's National Emergency Office said there had been some localized power outages and landslides blocking roads.
Comment: Less than a week ago a M6.2 earthquake hit Chile. There has been an increase in seismic activity worldwide recently.