BCGS Geoscience Map 2015-04
also released as Geological Survey of Canada Canadian Geoscience Map 223
Surficial geology, Granite Mountain area, British Columbia, Parts of NTS 93-B/8 and 93-B/9
The Granite Mountain area, in south-central British Columbia, includes the Gibraltar Mine (porphyry Cu-Mo deposit). Most of the map area is underlain by till of the Late Wisconsinan Fraser Glaciation. During deglaciation, meltwater channels were eroded in the hillsides of Granite Mountain and the mountainous ridge north of the mine indicating that ground at high elevation was deglaciated first. Meltwater was generally routed to the north through two main corridors: one in the west, in the region trending north from Cuisson Lake and a second one in the east, in the valleys of Ben and Skelton lakes and Arbuthnot Creek. Glaciofluvial sediments deposited during ice retreat represent potential granular resources. A glacial lake and associated delta are mapped north of Ben Lake from aerial photograph interpretation. At the western edge of the map area, large landslides most likely in bedrock and unconsolidated sediments occurred along the bedrock escarpment of the Fraser River valley. Anthropogenic deposits including wet and dry tailings surround Gibraltar Mine.
This map was produced as part of a joint initiative of the Geological Survey of Canada and the British Columbia Geological Survey, conducted under the auspices of the Intrusion-Related Ore System project as part of Natural Resources Canada’s Targeted Geoscience Initiative-4 program.
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