I discovered the same thing as well. Not all camps have Levemetes. Not all Levemetes give gathering and crafting leves. One camp will give level appropriate crafting and gathering leves so you have to find them. (Which is fun, but only now that I know how it works. I wish they'd have announced that without giving away the locations.)

Miner:
Level 5 - Adventurer Guild, Uldah
Level 10 - Adventureer Guild, Uldah
Level 15 - Camp Drybone, Thanalan
Level 20 - Camp Quarrymill, South Shroud
Level 25 - Camp Quarrymill, South Shroud
Level 30 - ??? (I've got one more crystal to hit in LaNoscea which is a level 30 camp I think, also heard they may be in Coerthas)
Level 35 - ??? (Gotta be in Coerthas)
Level 40 - ???
Level 45 - ???