As you ride in a golf cart into the mouth of the Iron Mountain limestone mine ... Over the years, the warehouse-like OPM ...

In the year just closed the mines of the United States produced metals, other than iron and steel, of a total value of $255,000,000, in round figures. of this total gold furnished $105.000.000.

In Wharton, the miners were going after iron. But how the mines are preserved makes a critical safety difference. Because the Sterling Hill mine has become a popular museum, it’s supported by ...