there is no salt biulding
Salt mine
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I see brine deposites but no salt mines to build..
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The salt building will show up when you have enough people on you Island. You have two menus in the click on the circle at the top of the menu.
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You can build salt water farms in the first peasant age. Click the top center button of the buildings menu, and the left tab is coastal buildings. I couldn't find this at first. Hope this helps.