Night Elf workers, called Wisps, need to Entangle a Gold Mine to gather from it, which takes 60 minutes. Once assembled, Wisps can be'loaded' to classic gold wow the mine, gathering gold without having to move. Being the ecological sort, they also don't destroy trees while gathering lumber, like the other factions. Pop a wisp on a tree, and it is going to float around collecting lumber for the rest of the game.
The Undead also have a particular gold arrangement -- a Haunted Gold Mine. Like Night Elf Wisps, Undead Acolytes stay on the mine and gather automatically. In 100 seconds, building one is slower than the Entangled Gold Mine, but Undead Acolytes don't have to stay around in 1 place to build, rather summoning a portal that attracts their structures into existence. When the portal is summoned, they are free to start other tasks.
Undead also differ in the other factions because they need to utilize their most basic combat unit -- Ghouls -- to collect lumber. They're also much more defensible, should your opponent target your employees.
All games begin with your starting town right next to a gold mine. Night Elf or Undead players will discover their beginning mine ready to use, won't need to worry about Haunting or Entangling immediately, before,the first Gold Mine collapses. That's right, Gold Mines do not last forever, so you'll be looking to expand quickly into the early mid-game. Locate a second gold mine early, and start planning to clean the area and expand to best place to buy wow classic gold a second foundation. You also need to watch for your opponent's expansions. If you've got two gold mines, and they've only got you, you're likely to be at a serious advantage.