Bug/Issue Switch Issue blueprint furnace

For some reason clint won't give me the blueprint for the furnace

 

Do you have the mines opened? Have you visited them? Have you mined some copper ore?

 

It won't let me mine the rock thats there to get into the mine with out a stronger pickaxe... And i cant make it with out copper bars which are made in the furnace

 

The rock that blocks your way to the mine entrance should be gone in a few days of first spring. Once you get into the cave, you should be able to descent the stairs nearly in the middle of the room. The rock blocked corridir in the right is something else you dont need to get into until later and at that point you should have means to. You get the furnace recipe only after you have first time mines copper ore, so you don't need to upgrade your pickaxe to get it.