Night Elf employees, known as Wisps, need to Entangle a Gold Mine to wow classic gold gather from it, which takes 60 seconds. Once assembled, Wisps can be'loaded' into the mine, gathering gold without having to move. Being the environmental sort, they also don't ruin trees while gathering lumber, like the other factions. Pop a wisp onto a shrub, and it is going to float around collecting lumber for the rest of the match.
The Undead also have a special gold arrangement -- a Haunted Gold Mine. Much like Night Elf Wisps, Undead Acolytes remain about the mine and gather mechanically. In 100 seconds, building one is slower compared to the Entangled Gold Mine, however, Undead Acolytes don't need to stick around in one spot to construct, rather summoning a portal site that brings their structures into existence. Once the portal is summoned, they are free to start other tasks.
Undead also differ in the other factions in that they will need to use their most basic combat unit -- Ghouls -- to gather lumber. They are also a lot more defensible, if your competitor target your workers.
All games start with your starting city right next to a gold mine. Night Elf or Undead players will find their beginning mine prepared to use, will not have to worry about Haunting or even Entangling immediately, before,the first Gold Mine collapses. That is correct, Gold Mines do not last forever, so you're going to be looking to expand quickly into the early mid-game. Find a second gold mine and start planning to clear the area and expand to cheap classic gold wow a second base. You also want to watch for your competitor's expansions. If you have got two gold mines, and they've only got you, you're likely to be at a critical benefit.