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The game only considers your best mining kit. Using your example in the title, if you buy overlord mining kits (best kits in the game), there is no need to craft the other kits, although doing so will still give smithing exp.
 "inthrees"){kind=small}
 "MilaC14"){kind=small}
 "talwraith"){kind=small}
 "lavaflame2"){kind=small}