Ore smelter

I want destroy my ore smelter but i can't.
I brought it to 50% with great difficulty and now is stopped at 58%, more than 100 blue bile points and it don't even lose 1%.
Is there something necessary that i don't know? (I use a pickaxe for destroy).
Ty for the answers
I brought it to 50% with great difficulty and now is stopped at 58%, more than 100 blue bile points and it don't even lose 1%.
Is there something necessary that i don't know? (I use a pickaxe for destroy).
Ty for the answers
