As it turns out, he is not very helpful and so the next step is to search for hints. Note that the quest description will not say which zone you should go to and incorrectly implies you need to do something else in the Steppes after talking to Razcsko. Just go to the place listed below for your level. This depends on the quester's level:
Immediately inside, the passage goes left and right.
To your left leads to the mine shaft, with two groups of two roekillik miners^ and a roekillik mining foreman^^ in your way. Kill them to avoid having them being called in as reinforcements later.
To the right a few steps is the roekillik forgemaster^^^. The forgemaster guards the first parchment. The forgemaster will call for help, which will bring in the first group in the tunnel to the left if you have not killed them.
After clearing the two groups in the left tunnel, enter the mine elevator room. Immediately to your right, on the ground, is the second parchment.
In the mine elevator room, there are three paths: a tunnel to the east, a tunnel to the north, and a passageway up the side of the elevator. Take the east path. It is guarded by another group of two roekillik miners^ and a foreman^^. Kill them.
Near the end of the east tunnel, a room is guarded by two orcish elite guards^^^. In the room itself, on a long workbench, is the third parchment. The same room has one more group of two roekillik miners and foreman, but they can be avoided with care. (Note: Do NOT take the north tunnel OR the ramp up. The ramp up is guarded by several orcish elite guards^^^, while the north pass is guarded by a group of roekillik and an epicx2 greater rumbler.)
You can not take explosives gained from one instance into another. If you exit with explosives you got from the miners, you will not see the option to select the Icy Dig. Delete the explosives then you will be able to re-enter.
Before you begin keep in mind:
If all group members zone out of The Icy Dig, all progress inside will reset. It is better to die and revive in zone than to escape.
Icy Dig has an 1.5 hour lockout timer that is set after killing an Epic monster, and you will need to return to the zone for the two subsequent quests. Killing the regular Heroic monsters/named will not initiate the lockout timer.
Using Escape will zone you into Everfrost.
All group members must be on the quest or you will not get option for Icy Dig.
Entering is not possible if there is too much of a level difference between group members. If you have a mercenary, don't summon him before entering because he does not meet the enter requirements and you won't be presented "Icy Dig".
Getting Ghagan's to start pathing can be a bit tricky. See Discussion for ways to ensure he paths.
It could take up to four charges to break down a wall. Make sure you purchase plenty of explosives before entering.
As you zone in, a roekillik watcher will immediately call an alarm and run off down the tunnel. If he is killed quickly, only a few miners will respond but if the roekillik watcher is not killed quickly, the whole zone will aggro you. The roekillik miners can be a challenge, even when grey.
Two named mobs normally stationed just past the gate across the chasm will run to the entrance and attack the group.
Moving through the entrance tunnel and across the chasm triggers Silence and Stun effects at certain places.
You can turn off the stun effect from the Frostpaw Sentinels by pressing a button that looks like a chunk of crystal in the wall in the basement of the castle at ( 74, -28, -384 ) /waypoint 74, -28, -384.
Blast a hole through the wall blocking off Vox's Chamber ( -1, 3, -271 ) /waypoint -1, 3, -271. (Stand as close as possible to the wall and "use" the Explosive Charge.) Once the wall comes down, there are two roekillik watchers who will summon more mobs to attack unless they are quickly killed.
Head to The Horn Room, blasting another wall at ( 159, 3, -345 ) /waypoint 158.92, 3, -345.38 in the process. Nothing will attack you upon blasting open the wall. Read the scroll at ( 146, 3, -450 ) /waypoint 146, 3, -450 There are two named roekillik by the scroll, Adjutant Kleek and Commisioner Kuluka. Both are 53^^^ Heroic and will aggro unless they are greyed out. Adjutant Kleek is a healer, so it helps to take him out first.
Next go to Alangria's Room ( -150, 3, -425 ) /waypoint -150, 3, -425, blasting another wall at ( -155, 3, -345 ) /waypoint -154.94, 3.24, -345.38. Nothing will aggro when the wall finally breaks. There are two named by the scroll, Adjutant Breek and Commisioner Twaynak (both 53^^^ Heroic), and they will attack unless greyed out. Read the scroll next to the nameds at ( -156, 3, -425 ) /waypoint -156, 3.14, -425. When the two nameds die Ghagan the Enforcer (Epic x4 Frost Giant) will shout some dialog but is currently bugged and will not begin to path See Discussion. If Ghagan kills you, he will repeatedly aggro anywhere in the zone. If Ghagan wipes your party, you may as well just leave the instance. He doesn't lose aggro when you die so he'll kill you on rez at entrance, over and over.
Head to the final scroll at ( 155, 3, -300 ) /waypoint 155, 3, -300 and collect it. It is on the first floor, but in order to reach this scroll you must climb the stairs past where Ghagan resides when he isn't pathing. If Ghagan does not path it is not possible to sneak past him without aggroing. Take the first turn right you see and hug the right wall. There is a a roekillik watcher in the hall after you leave the ramp. Bypass all doors you pass and continue to hug the right side of the wall until you reach the scroll. There are several roekillik in the area surrounding the scroll, but it is possible to avoid them when jumping down if you are careful.