Black sand placers, which are deposits of minerals formed by gravity separation due to sedimentary processes, that are located along the Mediterranean coast contain ilmenite, hematite, magnetite, zircon, garnet, and monazite.
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Due to its very high solubility in water ( max . density 3.1 g / cm 3 ) SPT is widely used as a heavy liquid for gravity separation ( sink swim analysis ) and density gradient centrifugation.
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The recovery had two steps : bringing the gravels containing gold to the surface and then separating the gold from the gravel using water and gravity separation, as a result access to water was important since it was necessary for the separation process and could also be used thawing the permanently frozen ground and washing down gravels from the upper terraces.
