Bloomberg Article on Where to Hide Your Gold

Apparently four feet underground will defeat most metal detectors:

The notion of keeping one’s gold in a safety deposit box—inside the banks many gold aficionados find so untrustworthy—is anathema to many gold bugs. Venzke, who predicts "runaway inflation" and a crisis leading to a "new form of currency within this decade," worries that the boxes won't be accessible if banks shut down in a crisis. "How are you supposed to get your stuff out of there?" he asks. 

Metal detectors are a big worry. Basic detectors can find metal on the surface or in the first 12 inches to 14 inches below ground, depending on soil conditions, says Louis Mahnken Jr., a sales representative for Kellyco Metal Detectors in Winter Springs, Fla. That’s why Venzke advises burying it at least four feet deep. There are online debates about the best way to frustrate such thieves, including using scrap metal as decoys or hiding metal by covering it underground with asbestos or mirrors.

Full article here.