If you dont get native clusters, you can place the ore down and mine it again. (you'll want a repair enchant on it for this)
Infernal furnace+3 bellows gives you 2 ingots+ a few nuggets+exp
Pulveriser gives you 2 ingots + 5% chance of XX dust.
Induction smelting gives you 2 ingots +5-10% rich slag.
Unless you have Gregtech (giving 3 ingots), TC has the best output
- but the rich slag can give a 3rd ingot from any ore so they kinda balance.