The most basic kind of gold placer mining is the using a prospector’s pan to swirl sediment-filled water so that unwanted sediment spills out to leave bits of gold behind. This method is based on the fact that gold is heavier than typical sediment. This concept is the foundation for all placer mining techniques.
There are two different, but not distinct, kinds of gold placer deposits. Shallow gold placers are generally within or close to existing rivers and are not blocked by other deposits. Deep level placers are buried underneath debris or solid stone. The rivers that developed these deposits may have been pushed into other channels by substantial shifts in the geography of the surrounding area.
Gold in these deposits can appear near the surface, in river beds or spread throughout the thickness of a stratum. Usually, however, gold is found in the lowest portion of superficial beds, just above bedrock.
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