Bulletin 63: Geology and Mineral Deposits of the Unuk River-Salmon River-Anyox Area, British Columbia
Table of Contents
Maps and Figures
Bulletin 63 represents new data on the geology of the Unuk River-Salmon River-Anyox region, much of which is relevant to the tectonic evolution of the Western Cordillera and to the concepts of metallogenesis in northwestern British Columbia. The study area includes part of the contact of the eastern Coast Plutonic Complex with the west-central margin of the successor Bowser Basin. Sedimentary, volcanic, and metamorphic rocks bordering the Coast Plutonic Complex range in age from Paleozoic to Quaternary. Geologically, geographically, and economically the country rocks of the area form a well-defined entity that the writer has called the Stewart Complex. Mineral exploration in the area is for vein, massive sulphide and porphyry deposits. The most important metals sought are gold, silver, lead, zinc, copper and molybdenum.
Several distinct periods of metamorphism, plutonism, volcanism, and sedimentation marked by deformation and erosion have been identified. The intensity of deformation has apparently decreased since the mid-Triassic Tahltanian orogeny although plutonism has increased in activity since the Triassic and reached a climax in the Tertiary along the eastern margin of the Coast Plutonic Complex. Neogene volcanic activity marked by alkali olivine basalt flows has occurred periodically along major north-south, northeasterly, and east-west fractures.
Within this orogenic cycle metallogenesis is related to volcanic, sedimentary, and plutonic processes during each major tectonic phase, and these processes have combined to produce broad mineral zoning and a large array of mineral deposits that characterize this portion of the Western Cordillera. The numerous fissure vein and replacement vein deposits in the Stewart Complex, including the Silbak Premier mine, comprise a common group of simple ore and gangue minerals. The major massive sulphide deposits include the Granduc property at Granduc Mountain, and the Hidden Creek, Double Ed, Redwing, and Bonanza properties at Anyox. Porphyry deposits include the molybdenum deposit at Kitsault and the copper-molybdenum property at the Mitchell-Sulphurets Creeks.
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