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Not Many People Know About The City 1200 Feet Below Detroit

It’s no secret that Detroit has been hit very hard by the recession. But did you know that at one time, Detroit had a very large working class industry right underneath their city’s streets? That’s right! Detroit had a very large salt mine that was basically an underground industry underneath their city. It was over 1,500 acres big and had over 100 miles of roads making up this underground salt mine. This mine stretches from Dearborn all the way to Allen Park. The mines were owned and operated by The Detroit Salt and Manufacturing Company. It was booming from the early 1920s up until 1983, when it was forced to close due to the falling salt prices. When business was good, they offered public guided tours, which was very popular with school groups. You can still see the entrance at 12841 Sanders Street, but it’s only open for delivery trucks. Read further to see exactly what they are delivering.


So how exactly did all of this salt get underneath the city of Detroit? About 400 million years ago, there was an area of land that is now called the Michigan Basin. This area was separated from the ocean but kept sinking lower and lower into the Earth. Because it continued to sink, the salt water from the ocean poured in as the ocean receded. Once the ocean water evaporated, it left behind huge salt deposits.


Throughout hundreds of thousands of years, the Niagara Escarpment was formed. This was a large basalt rock area that covered a lot of land, including the whole state of Michigan. Because of this rock, it buried the salt mine, basically preserving it 1200 feet below the Earth. According to some estimates, there is 71 TRILLION tons of unmined salt in these mines. Even though salt is not currently a hot commodity, it was at one time. For example, a long time ago in China, salt coins were used for payments and salt cakes were used in the Mediterranean. Even Romans paid their soldiers in salt!


When the salt was discovered in Detroit in 1895, everyone was thrilled! The Detroit Salt and Manufacturing Company came in 11 years later, in 1906, and decided to start digging a shaft down to the salt. But during this process they went bankrupt due to the high cost of the project, and many workers lost their lives. But they kept on trying. In 1910, The Detroit Salt and Manufacturing Company completed the 1,060 foot shaft and began working on the second salt bed. They were bought by Watkins Salt Company. After the shaft was completed and the second salt bed complete, they increased their productivity and purity. By 1914, they were able to produce approximately 8,000 tons of rock salt each month.


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Due to the productivity, The International Salt Company who had purchased the mine from Watkins Salt Company, decided to increase the productivity even more! They employed more men and used better equipment, which included electric power, locomotives, and mechanical shovels. They decided to build a second shaft in 1922 and finished it in 1925, which increased the capacity of the mine and also decreased the amount of time spent hoisting the salt to the surface.


Mining underground was not easy, by any means! Even in modern day conditions, underground mining is not an easy way of living, so you can imagine how harsh it was in the 1900s. They decided to start using donkeys to help with the workload, but due to the conditions, a lot of them would die an untimely death. The equipment that was used underground often stayed there too. It was just too hard to get them back through the 6×6 foot narrow shaft opening.

 
They continued mining the Detroit Salt Mines until 1983 when it was no longer a profitable business to be in. This mine remained unused until 1997, The Detroit Salt Company LLC purchased it. They began producing salt again in 1988, and is currently mining salt today. But they are no longer mining table salt. They now mine road salt, which is used during the very harsh Michigan winters. I sure am glad that this piece of history did not shut down and close their doors forever. Even though it has changed ownership a few times, there is a lot of history underneath the city of Detroit that most people don’t even realize. 


By Simone Preuss, SCRIBOL


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