... is the material that lies above an area that lends itself to economical exploitation, such as the rock, soil, and ecosystem that lies above a coal seam or ore body. The firm added, “Blue Water Rose divers noticed a small depression in the sand, and used a metal detector at close range to scan the area.
from Google Alert - metal detectorhttps://www.google.com/url?rct=j&sa=t&url=https://www.coinworld.com/news/us-coins/2018/02/divers-recover-coins-from-possible-Pulaski-site.html&ct=ga&cd=CAIyGjBmN2Y1NDMwZGU1NzA5Mzc6Y29tOmVuOlVT&usg=AFQjCNGCnV8NOKf6RGTBvxmAhH7mPiYkvQ
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