World of Warcraft
It appears that Gilneas Liberation Front took over the mine following the Cataclysm. Master Forteski, known as the Horseman, stood outside on command of Sylvanas Windrunner with a contingent of her most powerful Veteran Forsaken Troopers, believing she has the leaders of Gilneas Liberation Front cornered. However, it turned out to be a trap set by Ivar Bloodfang; the mine was in fact empty and about to explode. The Forsaken troops were blown to pieces as the mine exploded, with only one messenger to survive and report back.
Battle for Azeroth
The Alliance sought to use Deep Elem Mine as a resource in their war against the Horde, and sent forces to bomb away the rubble blocking the entrance. The Horde moved to get rid of the explosives so they could continue mining there themselves.
- The mine's name is likely inspired by the Grateful Dead song "Deep Elem Blues", which is itself a reference to the Deep Ellum neighborhood of Dallas, Texas.