So I can't do the bleacher thing with the 11" DD? Too much signal? Darn, we have TONS of bleachers around here, was really looking forward to mining them. Guess at some point I may have to spend even MORE $$$ on this hobby, huh? Also...pop out with a screwdriver? What is this? I thought you pretty much had to dig everything? How do you know what you can just pop out? Because it's so close to the surface?
Was just walking around in the park the other day, imagining what it would be like to mine it, and found an old nickel (1912). With no machine! Took that as a good omen, haha...
Most bleachers, or at least the ones I've seen have metal supports, 4' or so apart. Larger coils - you get within about a foot, the support start sounding off. So you're limited to essentially the very middle N/S - E/W between the supports. A smaller coil allows you to get closer, cover more territory.
Don't know where you're located geographically, so your ground conditions would determine whether you could effectively use a probe. If you've rocky soil, then a probe might not suit you - but still worth doing. I spent years in Michigan and Ohio, with their spongy soil, few rocks. I took a long thin screwdriver, and filed down the tip to blunt it. I'd pinpoint the signal, and gently insert the screw driver around the area until I hit solid. And that solid hit was very often the coin, got rocks occasionally (the feel). But most often, I'd find the exact location of the coin. If it were as much as 2"-3", I had another screwdriver with a bent end. I'd reach that in to beneath the coin, and just pop it out of the ground without leaving much of a hole at all - essentially leaving no trace I'd been there. You have to be gentle in your probing so you do not damage the coin.
Over time as you use this method, it's like detecting itself - you'll get the "feel" of what the target is you've probed down to. Certainly not coin ID, but the difference between coin or rock and even trash.
A good successful example of this, one time I hit a signal, pinpointed, and inserted the probe - found the target on first effort - it was 1 1/2" down. Stuck in my bent screwdriver under the target and popped out an 1894 Indian Head cent - no damage to it whatsoever.
This is a great skill to learn, and in fact, I think I'll post this trick as it's own thread. I've not found mention of it here yet.