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TitleCirca 180 Ma Ag-Bi-Pb-Mo-Cu-bearing quartz veins in a post-thrust calc-alkaline intrusion near Surprise Mountain, Iskut River area, northwestern British Columbia
AuthorMartin, K; Zagorevski, AORCID logo; Mihalynuk, M G; Joyce, N LORCID logo; Creaser, R
SourceBritish Columbia Ministry of Energy, Mines and Petroleum Resources, Paper 2016-1, 2016 p. 77-94 Open Access logo Open Access
LinksOnline - En ligne
Alt SeriesEarth Sciences Sector, Contribution Series 20150455
PublisherBritish Columbia Ministry of Energy and Mines
File formatpdf
ProvinceBritish Columbia
AreaIskut River; Surprise Mountain
Lat/Long WENS-132.0000 -130.0000 57.0000 56.0000
Subjectsgeochronology; igneous and metamorphic petrology; economic geology; igneous rocks; plutonic rocks; plutons; polymetallic ores; mineralization; silver; bismuth; copper; molybdenum; lead; zinc; porphyry deposits; porphyries; Mesozoic; Jurassic
Illustrationslocation maps; photographs; photomicrographs; plots; tables
ProgramGEM2: Geo-mapping for Energy and Minerals Western Cordillera, Regional porphyry transitions
Released2016 01 01
AbstractPolymetallic mineralized quartz veins are hosted by quartz diorite to quartz monzodiorite near Surprise Mountain, western Iskut River area. The intrusion is a homogeneous calc-alkaline, magnetite series granitoid that crosscuts an Early Jurassic thrust. New 40Ar/39Ar hornblende ages (178±2 and 179±2 Ma) from quartz diorite and a Re-Os molybdenite (180.2±0.8 Ma) age from a mineralized quartz vein provide minimums for the time of pluton emplacement. Both age and composition suggest affiliation with the Cone Mountain plutonic suite. Polymetallic quartz veins contain pyrite, galena, and molybdenite; minor bismuthinite, covellite, chalcocite, chalcopyrite and pyrrhotite; and traces of sphalerite. Geochemical analysis of veins reveals elevated Ag, Bi, Cu, Mo, Pb and Zn. Overall, the sporadic mineralization lacks clear horizontal metal zonation but may be related to polymetallic Ag-Pb-Zn±Au or Cu±Ag quartz deposit type, or may be peripheral to skarn or porphyry mineralization. Weak alteration, erratic and weak Au enrichment, and lack of metal zonation differentiates this occurrence from other Jurassic deposits in the area.
Summary(Plain Language Summary, not published)
This report presents preliminary results and models developed through GEM2 program on volcanic and plutonic rocks in British Columbia. It details the age and characteristics of magmatic rocks and associated mineralization on the basis of field and laboratory analyses. The results presented herein help progress GEM2 model to ultimately redefine the regional tectonic models of the Cordillera

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