At least five people have now been confirmed dead from a collapse at a coal mine in northern China, state media reported Thursday.

Rescuers, however, were racing against time to search for dozens still missing after a massive landslide Wednesday hindered overnight recovery efforts.

More than 50 people were trapped when a 180-meter-high slope gave way at the open-pit mine in the Inner Mongolia region's Alxa Left Banner area at around 1 p.m. (5 a.m. GMT) Wednesday, according to state broadcaster CCTV.

Hundreds of rescue workers were dispatched to the remote site, but another landslide later that day temporarily halted efforts to save those trapped beneath the rubble.

Rescuers have since resumed their work, with CCTV reporting Thursday afternoon that at least five people had been killed in the incident, with six injured and 48 still unaccounted for.

Footage from the broadcaster showed rescue workers in orange overalls and yellow helmets dwarfed by a mountain of rust-colored rubble, and excavators working to clear some of the debris.

"I had just started work when I saw slag falling down the slope. The situation got worse and worse," a rescued worker named Ma Jianping told CCTV.

"We tried to organize an evacuation, but it was too late – the slope came down," he said from a hospital bed in the neighboring Ningxia region, a catheter protruding from his throat.

The injured were all currently in stable condition, CCTV reported a doctor at the hospital as saying.

State media reported that the collapse had affected a "wide area" of the mine operated by the Xinjing Coal Mining Company.

It was not clear what caused the collapse, and calls to the company by the Agence France-Presse (AFP) went unanswered Thursday.

CCTV on Thursday said police were investigating the collapse, with "the relevant personnel currently under control." The report did not share further details.

A video posted on social media by a coal truck driver Wednesday showed rocks cascading down a slope, kicking up clouds of dust that engulfed several vehicles.

"The whole slope has collapsed ... How many people must be dead from that?" a male voice can be heard saying in the background.

"If I'd lined up over there today, I'd have died in there, too."

Zhang Li, an injured miner speaking to the Beijing News under a pseudonym, said he had been driving toward the mine when the landslide pushed his vehicle into a ditch.

"There are swollen bruises on my head and scratches on my hands," he said.

Chinese President Xi Jinping has instructed authorities to "do everything possible to search for and rescue the missing people," state media reported Wednesday.

Dangerous work

Located in China's arid north, Alxa League – which includes the Alxa Left Banner – is a sparsely populated region whose economy runs largely on mining and other extractive industries.

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

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

Around 40 people were working underground when a gold mine in the northwestern Xinjiang region collapsed in December.

In 2021, 20 miners were rescued from a flooded coal mine in northern Shanxi province, while two others died.