put the stuff in a sealed plastic tube and bury it at LEAST 4 foot down! Even with my top of the range detector i wouldn't detect it (I use a Minelab E-Trac) Don't put anything else above the stuff .If you really want to create a bunch of false positives, scatter the area with a box of washers or screws from the local hardware store. Just a couple of bucks and any metal detector operator will give up and go somewhere else.
gold and silver are tangible wealth. The number of paper bills, such as US Dollars, given to these precious metals are arbitartily set by bankers and Wall Street. You can still buy goods and services with gold and silver if the monetary system completely collapses. The value will be set by those doing business with each other, not the stinking banks or worthless Wall Street thieves.