Where frac sand mining has taken off

  • Graphic by: MARK BOSWELL , Star Tribune
  • Updated: September 29, 2012 - 11:39 AM

Southern Minnesota and western Wisconsin have huge deposits of sand that is perfect for hydro-fracking, a fast-growing mining technique used by the nation's oil and natural gas industry. Dozens of frac sand mines and processing facilities have opened in Wisconsin. In Minnesota, a few mines have opened and many more are proposed.

Where frac sand mining has taken off