https://www.youtube.com/watch?v=h23rF0xrhTE https://www.youtube.com/watch?v=h23rF0xrhTE historically this mine for example has been used to extract salt for ge

https://www.youtube.com/watch?v=h23rF0xrhTE https://www.youtube.com/watch?v=h23rF0xrhTE historically this mine for example has been used to extract salt for generations........