smelting and fortune does drop more ingots for vanilla ores like iron and gold but it doesn't work on ores like copper from mekanism.

Hi, this enchantment only works with these two ores for now. I will consider adding list when you can specify what ores should be affected by this enchantment.

It took me a while, but finally in the next update in the configuration file, you will be able to add ores that should drop more ingots.