Wow Carey, that sounds like some extremely tough hunting ground you have. Have to be honest , here lately I haven't had the health or the time to do a lot of hunting and what hunting I have done was mostly on the Tejon, all in mild dirt. However, I have hunted some with my Compadre ( (5.75 con.) and some with my Amigo II, and from all that I have read and studied on I would think , and I think others would agree , that the 5.75 con. would likely be your best coil for what you are up against. OR, maybe even go a coil size smaller with the 4" Tesoro coil. I know it is a slow go and that will get old fast, but I have to mention that several years ago I did find my oldest coin, a cut 178? (1 half of) Spanish I/2 Real in the middle of a nail bed, with the 4" coil.only 3-4"deep. I think I had it on the Inca at the time, or maybe the GS II. I may be confusing things a bit but can't help wonder how a small Widescan coil would do in all that slag. With that much iron debre and mineralization it might be worth a thought. Wish I was more help, but LOL,I have to be glad I don't have any experience with your ground situation. I believe I would have had to gone back to fishing, or something, but once the detecting bug gets you, you are got good! Hang in there and maybe someone will come along with some first hand know how.HH, Charlie