A mining accident in southwest China on Wednesday killed seven people and left one other trapped, according to state media.

State broadcaster CCTV said the incident occurred at around 10:00 am as workers were closing a ventilation shaft at a coal mine in the city of Leshan, Sichuan province.

The outlet did not give details of what happened but said the accident initially trapped eight people.

As of 2:00 pm, "seven people have been found dead, and one other trapped person is still being searched for with all-out efforts", CCTV said.

Mine safety in China has improved in recent decades, as has media coverage of major incidents, many of which were once overlooked.

But accidents still occur frequently in an industry where safety protocols are often lax, especially at the most rudimentary sites.

A major disaster happened in February last year when a slope at an open-pit coal mine in the northern Inner Mongolia region suddenly collapsed, burying dozens of people and vehicles.

State media later reported an official as saying 53 people were dead or unaccounted for when search and rescue work concluded two weeks later.

AFP

Workers sort coal on a conveyer belt at a coal mine in China. Deadly mining accidents are common in China, where the industry has a poor safety record. Photograph: Greg Baker/AFP/Getty

China mining accident kills seven: state media