According to youtube uploader, this video was taken in 1993 in an abandoned open cast tin mine next to the sea, near Pantai Remis in Perak, Malaysia. The face closest to the sea collapses and allows the complete flooding by Indian ocean waters.
That year, I received a call by the owner of a tin mine. He said that his mine, which had been running for a few decades, was about to collapse. I rushed to the scene with my video camera and waited for a few hours. Finally, I took this valuable footage. Although the footage lasted only a few minutes, it is horribly exciting enough. I hope that this video can let you all appreciate the consequence of ruining our environment.