Biden administration signs off on 20-year mining ban in swath of Black Hills

Measure comes after push and pull over mining of land for years

Pactola Reservoir in the Black Hills National Forest. (Travel South Dakota)

With less than a month remaining in his presidency, President Joe Biden's administration has taken steps to prevent mining activity near a world renowned South Dakota landmark.

The Department of the Interior announced Thursday that Secretary Deb Haaland had signed Public Land Orde…