To Dorgath -
The large tunnel is part of the mine. You can see old carts and tools in heaps, and you can also see support beams.
The small tunnel is naturaly made, as far as you can tell, and there is a bit of fresh air coming down from it.
To Jaspar -
You scout down the path about 100 feet. You then see two large humanoids is rags and skins slowly lumbering down the path, south, towards the mine shack. They are ugly and wart covered, with leathery skin and beadie yellow eyes. One is about 10 feet tall, the other 8 feet. They continue to speak to each other, quite loudly, which explains why you could hear them back at the mine.
"I'm telling ya' Blethos, leave that tunnel alone. Yer too fat to squeeze yer arse into it any way." says the smaller one.
"Shut ya fly-trap, Kreb, I'll do as I please. I haven't seen the boss for days anyway." replies the larger.
To all the others top-side -
There is pleanty of cover here to be found. You hear the deep, strange voices growing closer.