Quests for access the Trandalar Gates
Travel to the ice towers. The gate at the top goes to the valley of repose. If you take the gate, it will deposit you right next to the two quest givers.
A normal gate keeper that gives braveey quests ? kill something
A crafter that gives quests to collect 250 of slabs or uncut stuff to turn-in
The Bravery quests are:
Gatekeeper tells you, 'Greetings, I am the gatekeeper for Trandalar. I have been granted the power to attune you to the destinations of Trandalar -- thus granting you the ability to teleport here later on. Provided you have access to an appropriate travel gate, of course. Do you wish to be attuned to a Trandalar destination
Gatekeeper tells you, 'Would you like to be attuned to here (The Valley of Repose, The Valley of the Moon, Brandon's Shelf, Aroah Leap, or Rift's Edge
Valley of Repose - Gatekeeper tells you, 'This valley was long ago settled by my people. We were forced out when Katja erupted. Eclipse, an evil-tempered Obsidian Golem is continually reborn in Katja's belly. I will attune you to this valley if you can defeat Eclipse.'
Valley of the Moon - Gatekeeper tells you, 'In the days long past, we would celebrate the light from our beloved Moon with incredible feasts held in the Valley of the Moon. Go three cairns west of Brandon's Shelf, and then three cairns north along the road. If you can hunt Icefang, the winter mountain wolf that haunts the valley, I will attune you to the Valley of the Moon.'
Brandon?s Shelf - Gatekeeper tells you, 'Just south of this valley, through the frozen tunnel is Brandon's Shelf. Toward the ocean from Brandon's Shelf can be found the wiley old winter gruok called Harruf. Slay him and I will attune you to Brandon's Shelf.'
Aroah Leap - Gatekeeper tells you, 'If you choose to travel seven cairns west of Brandon's Shelf, you'll find the path to Aroah Leap. This is the western most tip of Trandalar. Roaming the path to Aroah Leap is Blizzard, the ice golem. Destroy Blizzard, and I will reward you with attunement to Aroah Leap.'
Rifts Edge - Gatekeeper tells you, 'On the rim of The Rift in the north is an outpost, long ago lost to time. If you descend into The Rift from there, you will encounter Giant Crusher, the nickel golem. Defeat him, and I will attune you to Rift's Edge.'
The crafting quests are:
Gatekeeper tells you, 'My brother over there asks for acts of bravery in order to attune you to the destinations of Trandalar. I ask for the resources that will help us rebuild here. Are you interested in being attuned to the destinations of Trandalar
Gatekeeper tells you, 'Would you like to be attuned to here (The Valley of Repose, The Valley of the Moon, Brandon's Shelf, Aroah Leap, or Rift's Edge?'
Valley of Repose - Gatekeeper tells you, 'This valley was long ago settled by my family's people. We were forced out when Katja erupted. My brother and I are rebuilding now, and we need assistance. While my brother looks for bravery, I look for cunning. Bring me 250 obsidian slabs and I will attune you here in the Valley of Repose.'
Valley of the Moon - Gatekeeper tells you, 'Before The Gifted, we would honor the light from our Moon with massive feasts held in the Valley of the Moon. Bring me 250 gold ore and I will attune you there.'
Brandon?s Shelf - Gatekeeper tells you, 'Just south of this valley, through the frozen tunnel is Brandon's Shelf. Bring me 250 granite slabs and I will attune you there.'
Aroah Leap - Gatekeeper tells you, 'If you choose to travel seven cairns west of Brandon's Shelf, you'll find the path to Aroah Leap. This is the western most tip of Trandalar. If you bring me 250 unspun cotton, I will attune you there.'
The Rift - Gatekeeper tells you, 'The Rift is found north of here. Follow the roads until you come to the great chasm. Bring me 250 nickel ore and I will attune you to there.'
It appears that the quest does not keep track if you mine it yourself or someone gives it to you. You just apparently need to have it on you when you talk to him.