I took it to the worst possible place I could think of. I have hunted a Revolutionary battle field for years. There is an area where the gathered dozens of wagons and burned them. The place is riddled with nails, thousands of small and large nails I tell ya. Not to mention the ground is heavly mineralized even in areas where there are no nails. The Cibloa was solid. I was there for less than two hours but the Cibola found a British musket ball and buckshot and NOT 1 nails. Solid as a rock.