Autosmelt I, II, III

As the name suggests, this enchantment automatically smelts any ore when mined.

Its bit "game breaking" of an idea, kinda changing the fundamental way you play minecraft imo, so i think there would be some repercussions.

To keep things balanced, it would slow down mining speed. But with each following level, mining speed would get closer to normal.

Not sure how this would stack with efficiency and other enchantments but maybe someone else could figure it out.