Wasn't using a Tesoro, but since there's no Gold Mountain forum and the GMT 1650 is a ripoff of the Bandido (with true 180 degree discrimination and split high/low disc ranges) I'll post it here. The Jaycee ballfield here in town dates from 1947, and it's the oldest baseball field in town that's still being used. We found a lot of silver coins there in years past, but the area where the concession stand was located until about 10 years ago is almost solid with all kinds of tabs and screw off bottlecaps - so many that even with a small coil every swing pretty much produces nonstop staccato signals - and is very difficult to hunt. I've pulled a few coins out of that area in the last couple of years, including four or five silver dimes, with the A.&.S Baron using a 5.5 inch coil but today I took the GMT 1650 with a four inch coil and hunted amongst the trash for a little over two hours. I set the disc to accept zinc pennies and thought I would probably find a coin or two but was surprised when I found 19; three quarters and two dimes from the late 1960's to middle 1970's, 12 pennies and two nickels that were in holes with pennies. I dug way over twice as many bottlecaps as coins, but also got a wheatie, a pin with Safe Drivers Award on it and a made in Italy silver pendant. The wheatie and a 1969 penny were directly under bottlecaps. Except for those two coins, which were right at the depth limit for the four inch coil, all the others were from an inch to three inches down. Way better than I expected. Three of the pennies were zincs and all three were partially rotted away because of the high acid content of the soil here. Not really worth posting, but I was pretty much amazed at how many coins I got out of that junk pile and wanted to tell someone.