Night Elf workers, known as Wisps, need to Entangle a Gold Mine to gather from it, which requires 60 minutes. Once built, Wisps could be'loaded' to the TBC Classic Gold mine, gathering gold without having to move. Being the environmental sort, they also don't destroy trees while gathering lumber, like the other factions. Pop a wisp onto a tree, and it is going to float around collecting lumber for the rest of the game. Much like Night Elf Wisps, Undead Acolytes remain on the mine and gather mechanically. In 100 seconds, construction one is slower than the cheap WOW Burning Crusade Classic Gold Entangled Gold Mine, but Undead Acolytes don't need to stay around in one place to construct, rather summoning a portal that attracts their structures into existence.