Unable to complete mining fieldcraft levequest "Breach and Build"

[LittleKittymob]

Time:
10:30 PM PST(6:55 AM Server time)
Friday September 6th(9-6-2013)

Frequency:
Once, but I did not try the quest again for fear of losing another allowance.

Character name:
Little Kittymob

World:
Leviathan

Location:
Whitebrim Front in Coerthas Central Highlands

Solo

Class & Level:
40 Miner

Coordinates of the bug itself:
6,18

NPC quest giver:
Voilinaut

Steps:
I was able to complete 7/8 of the quest's mine locations however the 8th location was nowhere to be found. All 7 of the other locations were near the quest marker except the last one which was most likely unreachable because it had spawned inside the mountain. This made it impossible for me to complete the quest and I was forced to abandon it.