Geology and Mineral Occurrences of the Salmon River Valley, Stewart Area(NTS 104A,B)
BCMEMPR OPEN FILE 1987-22
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Open File 1987-22 presents the geology, major mineral deposits and mineral occurrences of the Salmon River Valley, Stewart area (NTS 104A, B), one of British Columbia's most productive gold-mining camps. Production data and current reserves are tabulated for 15 precious-metal deposits including the premier, Big Missouri and Scottie Cold wines. The map accurately locates 125 mineral occurrences; all accompanying table provides Mineral Inventory File (MINFILE) reference numbers. Three geological cross-sections, three schematic diagrams and a list of references are included on the map sheet.
The map covers a 500-square kilometre area north of Stewart. The region is underlain by lower Jurassic calc-alkaline volcanic and associated sedimentary rocks of the Hazelton Group. These intensely mineralized rocks were deformed during Cretaceous time and intruded by Tertiary stocks and dykes of the Coast plutonic Complex.
During Late Triassic to Early Jurassic time, volcanism was accompanied by coeval subvolcanic magma emplacement. This was followed by late-stage dyke emplacement and quiescent flysch sedimentation in Toarcian to Callovian time (190 to 160 million years). Moderate deformation accompanied regional greenschist metamorphism that peaked during Cretaceous time (110 to 90 million years). Stocks and dykes of the Coast Range batholith intruded the deformed rocks in early to middle Eocene time and this was followed by a period of microdiorite and biotite lamprophyre dyke emplacement.
The deposits in the Stewart mining camp apparently formed during two metallogenic epochs. Gold-silver-pyrrhotite veins, like Scottie Gold mine, and gold-silver-lead-zinc-copper deposits, like the Silbak Premier mine, formed during the first epoch. Silver-lead-zinc veins with high silver grades, and spatially associated molybdenum and/or tungsten occurrences formed during the second epoch. Exploration potential in the camp remains high.
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