When attempting the level 35 mining leve "Mythril Madness" in Coerthas requires the player to mine 4 instanced nodes for resources. In my last 3 attempts to complete this leve I could not locate the 4th node, who's general area is marked on my map, but without the golden pickaxe icon as is displayed with the other 3. I have tried climbing the walls and searching the surrounding area for the node, but to no success.