GeoFile 2010-6: Age of Cu-Au-Ag mineralization at Copper Mountain: Part of a ~200 Ma copper epoch in BC
View GeoFile 2010-6 (PDF, 20.1 MB)
A chain of alkali Cu-Au±Ag-Mo porphyry deposits and coeval instrusive and volcanic rocks extend the length of the Canadian Cordillera. They are the product of a prolific metallogenic event. Mineralization at Copper Mountain is part of this event; recognized by workers in the 1970’s as coeval with intrusions that host the mineralization along with nearly coeval volcanic rocks. However, by the mid 2000’s this nearly coeval relationship was challenged by time scale revisions, changes to isotopic decay constants, improvements in dating techniques and over-interpretation of earlier cooling ages. If the isotopic age data were taken at face value, the mineralization at Copper Mountain appeared to be nearly 10 million years younger than the host rocks. With a new era of deep porphyry exploration about to begin, it was imperative to know whether mineralization was related to a younger, perhaps hidden intrusion or if existing age data were misleading.
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