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March 11, 2010

Photo courtesy of SGS Lakefield

Northern Dynasty and the Pebble Partnership have undertaken metallurgical test work on core samples from the Pebble deposit since 2004. These include:

• a series of bench-scale floatation tests to identify optimum reagents, grind-size and floatation residence times;
• lock-cycle tests to simulate material flows;
• comminution tests to assess grindability of mineralized rock;
• analyzing secondary gold processing alternatives;
• results to date indicate that metallurgical recovery rates at Pebble for copper, gold and molybdenum are above industry averages.