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Your assumption about water that reach the lower point in mines is correct, in fact in the older mines that develop let's say in a mountain they dug a lower level tunnel that collect all the water of the mine, this tunnel can run several miles like one in Sardinia (Italy) that reach the sea at 14 Km. This method have the obvious limitation that you cannot go ...


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No, not really. In simple terms, to be soluble in water, Pb must be in contact with it. But most of Pb is stored within the Zircon lattice, where water cannot diffuse through. For example, many zircons in metamorphic and magmatic-hydrothermal settings experience supercritical fluids, but preserve their U/Pb ratios (e.g. inherited cores in metasedimentary ...


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