Catfish, it may have bits of silver in it, then again, it may not. I found a nugget in my back yard that registed low grade silver with my 250, and it looked to have been burned in a fire. I didn't know what it was. A piece chopped off in the vacuum when I was cleaning and it's interior was real shiny. I took it to a jeweler to run the acid test on it, it came back as a possibility for silver, the burn test, proved otherwise. The jeweler thinks it was tin. Check out my thread in the What Is It? catagory, then look for my post entitled, Is It Silver? There are alot of different options for home testing on there that you can do to see if it's silver, or something else. Hope that helps, and happy hunting, it all gets better from here. The Ace 250 rules!!!!
