Smelt Ghost Iron

You learn Smelt Ghost Iron from the trainer at 500 and it's already green, and goes grey at 525. You don't learn Smelt Trillium until 600, and you learn Smelt Pyrite already grey. This makes leveling Mining by smelting impossible. If you're looking to level to 600 on a lvl 80 for the stam buff I'd suggest mining in the Valley of the Four Winds, from the Pools of Purity, through the heartland, over to the edge of Paoquan Hollow. There's a lot of nodes and an overall lack of hostile mobs.

As of BfA, taught by three trainers, all in The Jade Forest.
Neutral: /way The Jade Forest 46.0 29.4 [npc=65092]
Alliance: /way The Jade Forest 45.0 85.8 [npc=67024]
Horde: /way The Jade Forest 27.8 14.8 [npc=66979]

The trainer for this is Smeltmaster Ashpaw. She is located at the entrance to the cave in the Greenstone Quarry, which is south of the Tian Monastery in the Jade Forest at 46.1, 29.4.

Sorry forgot to mention, the closest anvil in the nearby Greenstone Village at 48.4, 36.9, by Len the Lammer, Blacksmithing Trainier.