One pan prospecting volume
The one pan prospecting volume is shown on this picture. This is Garrett Backpacker Pan filled with soil. When this exact gold pan is filled little bit below its hole on the side, the volume is just about 1.2 liters. By knowing the specific density of the soil, and by knowing the volume and actual gold prospecting results, we may know if the recoverable gold is profitable in the soil. That is field laboratory.
