This quest is not available in game.
Retrieve 4 Miners' Union Cards and return them to Wilder Thistlenettle in Stormwind.
Many of my friends perished that horrible day when the mine tunnel caved in. If your adventures happen to bring you into that wing of the mine in Moonbrook, please keep an eye out for any sign which might identify them. If you come across any of their Miners' Union Cards, bring them back to me and I'll make sure their families get some resolution from this horrible accident.