Northern Dynasty to challenge rejection on Pebble next month The area where the Pebble mine would be built, 320 km southwest of Anchorage, within the Bristol Bay watershed. Credit: Northern Dynasty Minerals. Northern Dynasty Minerals (TSX: NDM; NYSE: NAK) will in January submit its request for an appeal of the U.S. Army Corps of Engineers’ (USACE’s) negative record of decision (RoD) for its Alaska’s Pebble copper-gold-molybdenum-silver project. The company said it would argue that the USACE’s mitigation requirements for Pebble were contrary to policy and precedent in Alaska and that the agency’s rejection of the mining firm’s compensation mitigation plan (CMP) was procedurally and substantively invalid.