1. "Three Mines" is a documentary produced by the Film and Television Drama Documentary Center of China Central Radio and Television Station. It lasts for 100 minutes and has 2 episodes in total.
2. The documentary took two and a half years to shoot and produce. It took 400 hours to shoot underground and was broadcast on the CCTV record channel at 22:00 on December 13, 2019.
3. This documentary tells the history of a century old mine from the perspective of the first scene, showing the coal miners' indomitable demeanor of fearing hardships and dangers as well as their warm feelings of home and country.
