From WoWWiki

The Gol'Bolar Quarry Mine is a deep mine located in the heart of the Gol'Bolar Quarry. It was once a dwarven excavation, but when Rockjaw troggs invaded Dun Morogh, they took this mine as their base of operations. As opposed to the lower-level troggs in the outer quarry, this mine holds some of their strongest numbers, including their leader Hammerspine. Enter with caution.

Subzones of Dun Morogh

Amberstill Ranch • Anvilmar • Brewnall Village • Chill Breeze Valley • Coldridge Pass • Coldridge Valley • Frostmane Hold • Gates of Ironforge • Gnomeregan • Gol'Bolar Quarry • Gol'Bolar Quarry Mine • The Grizzled Den • Helm's Bed Lake • Iceflow Lake • Ironband's Compound • Ironforge • Kharanos • Misty Pine Refuge • North Gate Outpost • North Gate Pass • Shimmer Ridge • South Gate Outpost • South Gate Pass • Steelgrill's Depot • Thunderbrew Distillery • The Tundrid Hills