I am no expert on this. I am really not. I offered a loose mineral mix to my goats and a trace mineral salt block, and that's it. I never fed a commercial grain ration formulated for goats. Mine got COB (corn, oats, and barley) and the milkers often got rolled corn with whole cottonseed. These feeds did not have any added minerals in them, let alone copper. I never worried about the relatively low protein content in the COB because my alfalfa was so high in protein. I always figured they got enough copper from their feed. In fact, I really never thought about it at all. The only time this issue came up was when I fed Omaline, a Purina feed mix for horses, and I was advised not to because the horse feed had too much copper for goats. I would suggest you contact WSU or Davis for advice on what you should do because I think you need some expert advice. A lot of goat people are very free with the copper boluses and other copper supplements, and if not needed those supplements cause more harm than good. You really need to find out if they are needed in your case and what to do if they are. For instance if your soil has a lot of molybdenum, copper supplements are necessary because that mineral binds up copper. The symptoms of too much copper and not enough copper are similar, and copper toxicity is irreversible and fatal.