Charlie P. (NY)
Gold Member
- Feb 3, 2006
- 13,018
- 17,171
- Detector(s) used
- Minelab Musketeer Advantage Pro w/8" & 10" DD coils/Fisher F75se(Upgraded to LTD2) w/11" DD, 6.5" concentric & 9.5" NEL Sharpshooter DD coils/Sunray FX-1 Probe & F-Point/Black Widows/Rattler headphone
- Primary Interest:
- Metal Detecting
The concrete samples found in the late eighteen hundreds were analyzed as being 37% lime, 33% carbonate, 13% silica, 10% iron and 5% magnesium. And definitely man-made.
So then if they have a match they know they are in the right spot. But, then again, it apparently didn't help back then to have known where the vault was.