If your ground is badly mineralized then yes, I think the 12x10 actually rides on less ground than the stock 10" coil due to the sharp tight field generated by the 12x10 in the left/right perspective. Beware of the 15x12 in mineralized ground, though. I found it got less depth on coins in my soil, probably due to seeing too much ground matrix. Be also aware that there are a few guys who say they get more depth in really bad soil with an 8" coil than a 10" coil, but I think the 12x10 might still do better due to it seeing (I believe) less ground than a 10" round coil. Just because I think that it's got a tight/cleaner field than a convention round DD coil, that doesn't mean that I don't feel it doesn't get deeper than a round 10" coil, though. From what I've been digging in even dry conditions it seems to be popping coins deeper more often, but as of yet my two deepest coins have still be at 11" with the stock coil. However, that was under wet conditions at a known deep coin spot, and I haven't tried the 12x10 there when it's wet like that yet. It's still also covering 2" more ground length wise than a 10" coil. It's just that it feels like there is less "fuzz" in the field being generated so it's not soaking in as much ground stew IMHO.