What is a good metal detector for low cost?

I am looking for a metal detector looking for minerals (for example, tell you if found a piece of silver or copper), the only ones who can find are the type who goes out, no matter what they find, bottle caps, scrap peices of trash, etc.. I am specifically looking for one off if it is set to "copper" or "silver" is a decent price. Someone has a brand I know?

Kellyco Metal detectors are of good quality and cheap can also try a Garrett Ace 150 metal detector that retails for about $ 150 to use for metal Treasure Hunt "and stuff on the beach.

Testing a Garrett ACE 250 metal detector on my test patch , great metal detector for the price..