/ ...because it seems to be a common knowledge thing that I / have been aware of for years.
Gold occurs in sea water to the extent of 0.1 to 2 mg/ton, depending on the location where the sample is taken. As yet, no method has been found for recovering gold from sea water profitably.
This quantity is thousands of times smaller than the average quantity of gold contained in gold ore which is calculated in several grams per ton. Gold deposists average some 2-3 grams per ton (not milligrams).
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