Ever watch "Modern Marvels" on the History Channel? They did an hour-long episode on "Salt", and besides the aforementioned salt in NYS, there's also a huge deposit under Kansas, too. The TV show actually went into how they got out table salt, road salt, etc. Yeah, I was REALLY bored when I watched that, but it turned out to be halfway interesting.
I live about 10 miles south of the Salt River in Kentucky, where apparently there was a nearby salt lick that contaminated the river enough to give it that name. Kentucky has a lot of salt licks, there's probably some salt underground here, too.
