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It is the subterranean residue of portions of the vanished seas themselves, which have slipped through fissures and, protected from the heat, and fed still by the ancient seeping rivers, now moving sluggishly beneath the surface, maintain themselves, the hidden remnants of oceans, once mighty, which long ago swelled upon the surface of Gor itself. The salt in solution is obtained in two ways, by drilling and flush mining and, in the deeper pits, by sending men below to fetch the brine. In the drilling and flush mining, two systems are used, the double-pipe system and the separate-pipe system. In the double-pipe system fresh water is forced into the cavity through an outer pipe and the heavier solution of salt and water rises bubbling through the second pipe, or inner pipe, inserted within the larger. In the separate-pipe system, two pipes, separated by several yards, are used, fresh water being forced through one, the salt water solution, the salt being dissolved in the fresh water, rising through the other. The separate-pipe system is, by most salt masters, regarded as the most efficient. An advantage of the double-pipe system is that only a single tap well need be drilled. - (Tribesmen of Gor, Chapter )