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Metallurgy

Northern Dynasty and the Pebble Partnership have undertaken metallurgical test work on core samples from the Pebble deposit since 2004. These include:
  • multiple series of bench-scale flotation tests to identify optimum reagents, grind-size and flotation residence times;
  • small scale pilot plant;
  • lock-cycle tests to simulate material flows;
  • comminution tests to assess grindability of mineralized rock; and
  • analyzing secondary gold processing alternatives.
Results to date indicate that metallurgical recovery rates at Pebble for copper, gold and molybdenum are at levels expected for such deposits.