The search for economically important mineral deposits has become more challenging in recent years because it relies increasingly on exploration under cover or in areas of limited outcrop. It is critical, therefore, to develop new and innovative exploration methods that will assist in the search for concealed deposits. The Pebble porphyry deposit, located 320 km southwest of Anchorage, Alaska, contains one of the largest undeveloped resources of copper and gold in the world, and it is almost completely concealed (Fig. 1). Including both the Pebble West and East zones, the deposit has a measured and indicated resource of...
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