BCGS Geoscience Map 2015-03
also released as Geological Survey of Canada Canadian Geoscience Map 214
Surficial geology, Gnawed Mountain area, British Columbia, Parts of NTS 92-I/6, 92-I/7, 92-I/10, and 92-I/11
The Gnawed Mountain area includes the Highland Valley Copper mine (porphyry Cu-Mo), which is a major copper producer in Canada. Near the mine, till deposited during the Late Wisconsinan Fraser Glaciation is the most extensive glacial sediment. Glaciers flowed predominantly south to southeastward during this glacial event, as indicated by the orientation of numerous drumlins and flutings. During ice retreat, lateral meltwater channels cut into the flanks of valleys and mountain slopes indicating that ice occupied low ground when higher elevations were ice free. Accumulations of glaciofluvial sand and gravel, too small to be mapped at this scale, can be found close to these meltwater channels. The glaciofluvial drainage was generally to the south during ice retreat, with aggradation of glaciofluvial sediments in the Guichon Creek valley. Glaciolacustrine sediments in the Witches Brook valley were deposited in a glacial lake that formed when the eastward drainage was blocked by a mixture of ice and sediment. Mine tailings (anthropogenic deposits) are near open pits and in the valley that extends northwest from the mine (previously occupied by Pukaist Creek).
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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