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why are some areas of the earth rich in gold (or anything else)and others not? why and how did this distribution happen?
Metals resistant to chemical decomposition can accumulate by surface weathering. Gold, diamonds, zircon and titanium are all minerals found in stream gravels and beach sands. Placer gold deposits form when gold bearing rocks are weathered and the gold particles are washed down into and concentrated in the streams and rivers draining the area.
Does this mean that sea bed mining of gold (particularly near current or past river estuaries) would be profitable?