Geoscience Map 2006-6: Geology of the Central Toodoggone River Map Area, North-Central British Columbia
(Parts of NTS 94E/2,6,7,10 and 11)
View Map (PDF 4.0 MB)
Download Shape files (ZIP, 858 KB)
1 sheet at 1:50 000 scale
Contribution to the Toodoggone Targeted Geoscience Initiative II - Mining Company Partnership
This geological map is the result of a 1:20 000-scale bedrock mapping program conducted from 2003 to 2005 as part of a partnership between the BC Geological Survey and Stealth Minerals Ltd., Northgate Exploration Ltd., Finlay Minerals Ltd., Bishop Resources Inc., Sable Resources Ltd., the Geological Survey of Canada, and the University of British Columbia.
This map covers approximately 900 km2 of mountainous terrain between the Finlay River and Chukachida Lake, and extends the detailed map coverage at 1:20 000-scale farther to the north beyond published BCGS Geoscience Map 2001-1, centred on the Kemess South Au-Cu porphyry mine. It portrays an updated and revised stratigraphy for the Early Jurassic Toodoggone Formation and comagmatic plutons of the Black Lake intrusive suite. The Toodoggone Formation in the map area is largely composed of a previously unrecognized stratigraphic succession that is subdivided into 4 new units (i.e., Belle, Pillar, Graves and Junkers). These units consist mainly of subaerial basalt to rhyolite volcanic rocks and derived sedimentary rocks that were deposited between 194 Ma and 186 Ma. They overlie the previously defined, pre-194 to 200Ma Toodoggone Formation, and older Late Triassic basement and occur above an erosional unconformity.
Regionally the Toodoggone Formation is noted for numerous epithermal precious metal occurrences and quartz monzonite to monzonite plutons of the Black Lake intrusive suite locally host Au-Cu porphyry mineralization. Copper-magnetite skarns are locally developed within Early Permian limestones of the Asitka Group crosscut by Early Jurassic plutons.
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