The nice thing about the black forest biome is the fact that there are already stone structures that'll make building a new camp pretty easy, it's best to make a base using a stone structure or just a decently defended base with something like a trench with a smelter and actually craft your items there rather than hiking back to your main base every single time. Remember, you can't teleport ore or ingots but when they're fully crafted you can teleport with them.

Also this is something that's very commonly stated in Youtube videos, and you probably know this, but just to be safe I do want to mention that there's more copper ore underground. Even if you get all the copper from on top of the ground, if you keep digging using your pickaxe you will find more. You probably know this, but just in case you don't it's really necessary knowledge for people who've gotten to the bronze age.

Edit: Maybe stop trying to find realism in this game. Some things are a bit realistic like smoke damage, however certain things still need to be balanced a certain way for gameplay reasons, so realism being your benchmark is going to really make this game difficult to enjoy.