Geology of Terrace Area
(NTS 103I/9, 10, 15, 16)

BCMEMPR Open File 2007-04

By J.L. Nelson, R. Kennedy, J. Angen and S. Newman

View Open File 2007-4 (PDF, 23 MB)

See also Geofile 2008-11, Terrace Preliminary Geodata Release

Open File 2007-4 covers the area north of Terrace, BC, from Kitsumkalum Lake to the mountains east of the Skeena River.  It incorporates and builds on Open File 2006-3 (Usk map area), adding geological and assay data collected  during  the 2006 field season. The area includes extensive volcanic exposures of the Lower Jurassic Hazelton Group, overlain by strata equivalent to the Salmon River (Troy Ridge facies) in the Iskut area, that form a distinct siliceous interval below the base of the Bowser Lake Group.  Jurassic and Eocene plutons are host to precious metal veins and  copper  and  molybdenum  porphyry mineralization. The area  has a core consisting of a major Paleocene-Eocene uplift of metamorphosed Hazelton Group strata and deformed ca 60 Ma plutons. Regional rock relationships shown on the map suggest that this was a footwall panel below an earlier (Cretaceous?) northeast-vergent thrust fault. Hanging wall strata are exposed east of the Skeena River.  Provincial Map shows the location of major exploration projects; producing metal, coal and industrial mineral mines and the communities they influenced in 2006.  The PDF of the map is plot size and in colour.