This has been an active salt mine for quite a few years. It is 650 feet underground and according to their estimates, they have enough salt there to last the next 2500 years, even with the fact that the salt is mainly used for roads rather than for food.
Of course, a scenario involving millions of years of time for its deposition was liberally sprinkled in with the salt. The standard model is that an arm of the sea was enriched with salt brine, which then repeatedly precipitated as the brine solution hit saturation.
Years ago, I wrote one of my geology theses on a different model of getting salt, which did not take millions of years of evaporation (you can read the theses online). One of the guys who had accompanied me on this field trip mentioned that a recent National Geographic magazine article mentions a new and very promising model, which sounds like it has similarities to what I had suggested about 30 years ago.
I am eager to read the article he mentioned. If it is about what he says it is, then expect a Think and Believe article on that before too long!
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