The Hillsbrad Town Registry indicates that the Azurelode Mine is under Alliance control. Furthermore, the mine is a prime source of iron ore for the Alliance armories.
Even though we've struck a decisive blow to the town of Hillsbrad, the Alliance still supports and protects the Azureload Mine fervently.
The mine lies due south of Hillsbrad. Go there and slay the foreman, a human by the name of Bonds. Kill his miners as well. That should send a clear message to the Alliance.
The mine can be found south of Hillsbrad Fields and west of Southshore. There are guards outside the mine protecting it.
Foreman Bonds can be found deeper in the mine in a large room with a platform. When Bonds gets low on health, he'll summon 2 dwarves to help him fight.