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Geologic setting
The image here identifies the geographic location. The geological setting is important because there are several known deposits throughout British Columbia in similar geological settings.
The deposit is a Cu-Au porphyry occurring within porphyritic monzonite stocks and Takla group volcanics. The essential feature of the zone focussed upon in this example is a monzonitic stock intruded into volcanics. There has been hydrothermal alteration near the boundaries of stock and porous trachytic units. The whole deposit has been complicated by subsequent faulting, rotation and erosion.
The mineralization system associated with a typical Cu-Au porphyry system is shown below, extracted from McMillan (1991)*. Diagram (a) indicates the metallic mineral distribution. The solid line in the middle represents the initial stock. The areas of potassic and propylitic alteration are shown in (b).
* McMillan, W. J., 1991, Porphyry deposits in the Canadian Cordillera, in Ore Deposits, Tectonics, and Metallogeny in the Canadian Cordillera, W. J. McMillan et al., Eds., Ministry of Energy, Mines and Petroleum Resources, Province of British Columbia, 253–276.
| © UBC-GIF
January 9, 2007
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