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Geologically, the Pebble deposit formed about 90 million years ago when older sedimentary rocks were intruded by a granitic rock laden with hot fluids carrying dissolved copper, gold and molybdenum. As the fluids cooled, low concentrations of sulfide minerals hosting the copper, gold and molybdenum metals formed in thin quartz veins and as small disseminated grains throughout the granitic and adjacent sedimentary rocks. This type of deposit is referred to as a porphyry copper deposit with associated gold and molybdenum.
View the Pebble mineral resource estimate