Have to disagree on your point about copper imports. Getting outside sources of metal is neither cheap nor efficient. Can you imaging getting Canada to supply all the steel for US? The transportation cost along will make the accountants hang someone from a tall building, and we have good land routes. Our current supplier (metal worker) is trading using primitive boats, and salty air will damage the ingots. And if we are getting ores, then our smelters will be at the mercy of supplier; who may or may not undergo issues of their own. All in all, metal is good and getting local sources are better and cheaper.