I'm not especially sure as to whether the skill is called "Material Decomposition Low-Quality Copper Ore" or whether it's called "Material Decomposition Middle-Quality Copper Ore". So better check both and the skill levels required.

Like I've said...

No such thing as "Material Decomposition: Low-Class Copper ore" you can't decomp LQ into anything else.

^ Yes, but you can decomp something into Low-Quality Copper-Ore...Besides, you can't tell with all these mistakes in the naming of prod. skills


EDIT: Ok, I've found it. It's in the very first page under the alchemy tab. It's in the 2nd row(horizontal), 5th column(vertical)

Oh, BTW, it's called "Material Decomposition:Low-Class Copper Ore."