From WoWWiki

Echo Ridge Mine is a mine located northwest in Northshire Valley in Elwynn Forest. It has recently been taken over by Kobolds, to the frustration of the humans living in the area.

The kobolds inhabiting the mine are needed for a quest. The mine is very straightforward, and the quest should be easy as the kobolds just wander around and you can run past them without them attacking. In the back of the mine is a larger room, and in this area a chest pops and could provide a few extra copper as well as a new weapon. Worth checking for.

Subzones of Elwynn Forest

Brackwell Pumpkin Patch • Crystal Lake • Eastvale Logging Camp • Echo Ridge Mine • Fargodeep Mine • Forest's Edge • Goldshire • Hall of Arms • Heroes' Vigil • Jasperlode Mine • Jerod's Landing • Library Wing • Lion's Pride Inn • The Maclure Vineyards • Main Hall • Mirror Lake • Mirror Lake Orchard • Northshire Abbey • Northshire River • Northshire Valley • Northshire Vineyards • Ridgepoint Tower • Stone Cairn Lake • The Stonefield Farm • Stormwind City • Thunder Falls • Tower of Azora • Westbrook Garrison