Thailand Prospecting
This is a video showing prospecting using metal detectors in Thailand, as it happens in areas with natural gold in the ground. The detecting is done on private property using mostly VLF specialty gold detectors such as the Gold Bug 2. The surface soil is examined, the detectors are good at detecting small sub 100 mg (1/10th gram). After searching the surface a tractor scrapes off the soil for examination of another layer of ground. See more at http://www.thaimetaldetectors.com/ .