I'm currently miner 31 and Armorer/Blacksmith early 20.
It's my opinion that leveling miner without leve will net you enough material to level 1 craft without issue easily if you plan ahead and mine the right material. I might have enough for 2 craft if you get material at your level only or below while gathering (slower leveling in miner but more material return)
Also, if you want to work in your achievement at the same time (Mining your own business) it will cause issue as well as you might need to mine 1000 time in a zone that yield no material for your craft.
Pryssant Novio - Ultros Server.
<Chocobo> <cooking>? <Yes, please>!