A video of the moment part of an open-pit coal mine collapses in Inner Mongolia, northern China, has come to light.

Workers and vehicles were suddenly buried under tons of earth and rock when part of the mine, operated by Xinjing Coal Mining Company, collapsed, CCTV noted.

Video uploaded to social media sites — taken by a coal truck driver — shows huge rocks rolling down a hillside, kicking up clouds of dust and crushing vehicles.

“The whole slope collapsed (…) How many people were killed?” a male voice is heard saying off-screen. “If I was in line down there today, I’d die too.”

The accident happened yesterday Wednesday morning (1:00 a.m. local time) and claimed the lives of 4 workers, according to the latest count.

Rescue crews were working to find at least 50 more missing people when the operation was suspended due to another large landslide yesterday afternoon