Sorry but you lost me. If you are going to dig and remove everything so you can use the large coil why would You need to invest in a smal coil?
Jpiddle
I don't go into these trashy sites with those small coils and remove everything, I go in with the idea of digging all solid signals whether they are good or trash.
It has been said that the larger coils will find all the signals with the small coils will, and this is true for the most part, however, it's not about getting all the signals its about getting the correct signal with the right info on every signal that you can.
Masking is a bigger problem than most people think, and using larger coils which have a definite possibility of getting incorrect information because of more than one target under the coil at one time is great.
By using the small coil I can get close to surgical precision and much better information on each target which I can examine one at time.
This way I can actually dig a ton less than having to dig everything at the site, and still find more faster and more efficiently.
I know this is true and I have proved to myself by hunting sites that have lots of trash as hard as I could, as efficient as I could II going slow and trying to examine each signal with big coils and yet by going back with the smaller coils I found so much more so easily... including some great targets like gold that I had missed in the past along with several other hunters at exactly the same site.
Again, 18 goal targets in 16 months... I believe a hundred percent that I might have been able to find a few of these but there is no way I would have found all of them by using only the larger coil.
Well, maybe I can find all of them using the big coil, eventually, but that would entail using much, much more time and if I did I would still be digging so much more trash then I already have and I still wouldn't have all 18 of those targets in my treasure pouch to this date.
Small coils let you work less and find more in a shorter time.
There is just no other way around it.