Yeah, I’m going all safety sally here because I have had friends die from cancer from 1of those 2...
At least use a respirator when burning, and gloves handling the copper after burning. Burning the copper is a common one known that the fumes are way toxic, but most don’t know that toucking the burned copper with bare skin allows absorption through the pores ans will do both skin cancer at the location and the heavy metal issues inside the body. The safety training I’ve gone through back when I was working as electrician rewiring partial burned houses on a city contract showed only metal in fire worse than copper is lead outside radioactive crap.
Same thing for the lead. I had several 5 gallon buckets of lead to make bullets for a .41 remington cause ammo is hard to find for it. A friend that had been casting his own bullets for 5 years (about 800 a year) and used a respirator for the last 4 years of it. Before then a regular mask, and always outside with 5-10 mph winds behind him. He had a stockpile he was happy with and wasn’t going to make anymore. Didnt matter- the weekend before he was going to show me how and give me all his stuff to do it with he got sick. Thursday went into doctors, they called him Friday am into emergency check at oncologist. Friday noon he found out he was late stage 4. Died the next weekend. Lead is no joke. This dude was 45 years old, could full out sprint a mile, about 6 months before, good health, etc.
Be careful man.