by 
The Curious Bag
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Metal detectors work by sensing or picking up metallic objects that are buried in the ground. Beaches, backyards, and parks make for prime treasure-hunting grounds.
Coins
Whether it is a quarter or an older coin worth more in value, money of all metallic origin can be picked up by the metal detector--paper money not included, of course.
Jewelry
Lost rings, necklaces, and watches, for example, are not immune to the metal detector's beep. Any jewelry with a metallic setting will be sensed by the detector.
Aluminum
Any object with a trace amount of aluminum will be picked up by a metal detector. Examples of aluminum items that you might come across during one of your searches include but are not limited to cans, pans, water bottles, and batteries.
Gold
When you use a metal detector, it is similar to "treasure hunting." When people think of treasure, they think of big chests full of gold coins. Gold nuggets or coins can be picked up easily by a metal detector.
Trash
Not everything a metal detector can pick up is treasure. Metal objects that are old and rusty could be uncovered. For that reason, they should be handled carefully or passed over.
Source:
Resource:
"Boy's Life" magazine; Backyard Treasure Hunt; Bob Bass; May 1996
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