What Is the Deepest Mine in the World?
The mine that goes farther down than any other in the world is the rock salt mine near Berlin, Germany which is 4,175 feet. It is not, however, straight down but somewhat slanting. The Calumet Copper Mine near Lake Superior is at a depth in some places of 3,900 feet.
The deepest boring in the world is an artesian well at Potsdam, Missouri, which is 5,500 feet deep or more than one mile straight down.