Where to use the coin mining den key in DMZ in Modern Warfare 4

The coin mining den key in DMZ in Call of Duty: Modern Warfare 4 is one of many keys you can find in the extraction mode, used to unlock a locked door somewhere in the map that contains lots of loot behind it. Obtained by completing the "Operation Shopping Hacks" mission, the coin mining den key is described as opening the "e-coin mining lab in NuriGO West, east of the westernmost gas station inside NuriGO Mall." That's still somewhat vague, though, so let us direct you to the exact coin mining den key location in DMZ in Modern Warfare 4…