39 years of Kaala Patthar. (24–08–1979)

Kaala Patthar is a disaster drama film, based on the Chasnala mining disaster. It was produced and directed by Yash Chopra, with a screenplay written by Salim-Javed.

This film is the fourth collaboration between Amitabh Bachchan, Shashi Kapoor, and director Yash Chopra after the hugely successful Deewaar (1975), Kabhie Kabhie (1976) and Trishul (1978). However, this film did average business at the box office. It was nominated for 8 Filmfare awards. While Rajesh Roshan composed songs for the lyrics penned by Sahir, the background score was composed by Salil Chowdhary.

The Film is regarded a Cult Classic, and ahead of its time. The film is an underrated classic directed by Yash Chopra with a stunning performance from Amitabh Bachchan, who has little dialogue, but conveys his conflict through his expressions