Mining is one of the 8 damage types. In-game, it is represented as a green projectile (Abstructor), laser (Mining laser) or Lightning Cloud (Mzungu Trading Defense).
Mining weapons also have the ability to extract resources from asteroids.
The Gunner class utilizes this damage type far more often than other classes.
A critical hit with mining damage decreases energy regeneration in the victim ship for a few seconds.