Open cut (IMAGE) DOE/Fermi National Accelerator Laboratory Caption A conveyor carried almost 800,000 tons of rock, excavated a mile underground, into the Open Cut in Lead, South Dakota Credit Stephen Kenny, Sanford Underground Research Facility Usage Restrictions None License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.