The Giant Salt City 1200 Feet Beneath Detroit Mike Richard May 21 Detroit, What We're Reading Detroit’s salt mines are like an underground city within the city. It is a massive expanse of 1,500 acres and over 100 miles of roads right under everyone’s feet. … The Detroit Salt and Manufacturing Company operated the mine until 1983 but then falling salt prices forced the mine to stop production. In its heyday in the 1920s, 1940s and ”˜50s, the mine was open to the public with guided tours — a popular educational trip for school classes. Today, the entrance to the mine at 12841 Sanders Street is only for delivery trucks and public tours have not been conducted since the 1980s. As the following images suggest, a mine visit must’ve been quite something. See the full article with photos at Environmental Graffiti. Leave a Reply Cancel Reply Your email address will not be published.CommentName* Email* Website Let\'s Make Sure You\'re Human ... *Time limit is exhausted. Please reload CAPTCHA. − 3 = Notify me of followup comments via e-mail. You can also subscribe without commenting.