From WoWWiki
The entrance to the Garrison Armory
Inside the extensive mines
The Garrison Armory is a vital Alliance mining outpost near the Nethergarde Keep in the Blasted Lands. Here Alliance miners toil to gather precious resources and minerals for the Nethergarde Keep. These resources are frequently shipped to Stormwind in exchange for the other vital resources Nethergarde Keep depends upon to survive. As with similar places, the mine in this mine cannot be mined by alliance players, but can be with horde. (Similar to mines found in mines controlled by horde NPCs, for horde players.)
