Fly to Iron Siegeworks, Frostfire Ridge. (For those without the flightpath, the route to Iron Siegeworks is below).
Run straight along the path in front of you (it goes roughly west).
At the very end there is an Iron Stonegrinder facing the rock wall with a big boulder in front of it. To the right of the boulder is a fire. To the left of the boulder is the entrance to a tunnel that will take you through the rocks.

Entrance to tunnel @ 79, 56 (Frostfire Ridge).

Map and screenshot of the tunnel entrance. (Wasn't able to find a relevant location on Wowhead to post the images).

This is the way to Iron Siegeworks, Frostfire Ridge from Gorgrond (all coordinates are shown on a map if you click on the links - mouse over the dots on the map for the corresponding points):

The closest flightpath to the pass is Deeproot, Gorgrond @ 46.4, 76.6 (map 1). From there, take the path north to the point marked
44.6, 72.6 (map 1).
At the crossroads, turn left (west), and it will lead you to the entrance of Deadrgrin @ 41.5, 74.1 (map 1).
At this point you have 2 options:
Option 1:

Follow the main path through Deadgrin, and it will lead you to Gorgrond pass.
There is another way through to Gorgrond Pass slightly south of Deadwind that doesn't involve running through so many mobs. This is @ 41.3, 75.7 (map 2). Just make your way to the entrance of Deadwind and before going in, go south and cross a little pond.
Both routes lead to Gorgrond Pass @ 36.1, 78.3 (map 1). Take this through the mountains, and you will emerge in Frostfire Ridge, Bones of Agurak @ 87.6, 72.3 (map 3).
From Bones of Agurak, follow the path veering to the right (going north) that parallels the mountain ridge and you will get to the Iron Siegeworks flightpath @ 86.7, 62.1 (map 3).

(Edit: added info to get to Iron Siegeworks)

Комментарий от Draewind

(How to get to Frostfire Ridge)
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HUNTERS ... ... After you loot the Тенеягода from Мать Ом'ра and show it to Гара.
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Inside the Hunter's Hall (entry @ 63.0, 65.7) you should see a Убийца великанов из клана Громоборцев near the central fire.

/way 63.0 65.7 Hunter's Hall

Hunter's only need to kill one for the Древняя кость to drop.
How to tame Gara the Spirit Beast

Комментарий от 1440403

I found this item off a Thunderlord Egale-Eye.

Комментарий от Extrawesome

/way Talador 37.6 76.7 Wooden Bowl (Gorebound Legionnaire)
/way Spires of Arak 68.2 43.2 Elder Incense (Sethekk Prophet)
/way Nagrand (Draenor) 72.1 36.2 Small Fruit (Warsong Marauder)
/way Nagrand (Draenor) 81.8 61.1 Small Fruit (Warsong Marauder)
/way Nagrand (Draenor) 89.4 70.6 Small Fruit (Warsong Marauder)
/way Frostfire Ridge 60.67 63.5 Ancient Bone (Thunderlord Giantslayer)
/way Frostfire Ridge 25.8 9.7 Torn Cloth (Necrophyte)
/way Gorgrond 43.6 50.7 Crude Effigy (Drywind Bonepickers)

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