Supporters of the moratorium, which expires in 2032, say new mining activity will likely boost the risk of uranium-contaminated water flowing into the Canyon.
The four-day review that begins today marks the first time in 20 years the NIRB has been asked to reconsider a decision on a project and go through another review process.
The rock, a 5.36-carat green gem quality octahedron rough diamond, was unearthed at the company's Krone-Endora project, located next to the world’s third largest diamond mine.