In general, nearly all federal and state lands are off limits- except if you are given special permission or issued a permit. In some states, many counties also strictly prohibit metal detecting in all of their public parks…. Metal detecting is OK in most parks (not all) but you cannot remove anything from the parks.
Do You need a special metal detector for gold?
A: No most good metal detectors will detect Gold coins and jewellery quite easily, however a more specialised unit may be required for nugget hunting in remote places such as Australia and other dessert areas.