Most gold prospectors can't look very deep, because small nuggets are not that deep in the ground. In a pristine environment, you won't have to dig very deep to find small nuggets, so there may already be a limit. For some gold prospectors, this will meet their own requirements and desires. As a guideline for depth, a nugget half the size of a grain can often be found at a depth of two inches. A nugget the size of a match can be found at a depth of five inches, and a huge nugget can be found at a depth of a foot or more using pulse sensor technology. Finally, the size of the nugget correlates with the depth at which it is found; the larger the nugget, the deeper it is likely to be buried.