This can be tracked down in the cave just below Tian Monastery. You'll see a mining pick sticking out of rocks at the bottom level of the cave, which - when clicked - will give you the lovely Ancient Pandaren Mining Pick.
As a trick for NPC Scan users, you can manually add this container object - ID# 213364 - to your list and it'll give you a notification if you're within range and the pick is spawned. Definitely a time-saver over running through the cave blindly and looking everywhere.
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