To receive this quest you must have completed Senir?s Observations I, speak to Mountaineer Thalos in the Coldridge Pass before you go through the tunnel. He will say:

The troggs in the tunnel are extremely hostile, and haven't shown any hesitation in attacking travelers through the tunnel. You seem tough enough, though, so you should probably be safe.

Directions? If you're going to speak with Senir, you'll find him in Kharanos.

Make your way through the tunnel, and after you come out on the other side, just keep following the road, it'll run right into Kharanos.

Speak to Senir Whitebeard

Did you remember to speak to Hands Springsprocket, the gnome next to Thalos? This will begin the Supplies to Tannok quest. When you?re ready, head through the tunnel leading to Dun Morogh. You will meet Rockjaw Raiders (level 3-4) in here, but just slap them a few times and they?ll run screaming! When you get outside, follow the road til you reach Kharanos and right at the edge of the town you?ll see Senir Whitebeard. Speak to him and he will say:

What?s this? Oh, my brother?s report, hmm?

I told him to be sparing with the use of the King?s name, but he didn?t listen. No harm, I suppose, though it?s sure to ruffle some feathers in the Senate. Not that those weren?t some feathers that needed ruffling! Hah!

Nonetheless, I guess that means that I should send my report on to Ironforge as well, but I must admit I?m a bit behind. Bloody cold.

I should have some work for you later, if you?re interested.

The work he refers to is the Frostmane Hold quest, so be sure to check up with him a bit later when you hit level 7.