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TitleSeismic imaging of porphyry deposits with distributed acoustic sensing of fibre-optic cables: a summary of results at the New Afton Cu-Au mine, British Columbia
LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorBellefleur, GORCID logo; Schetselaar, EORCID logo; White, DORCID logo
SourceTargeted Geoscience Initiative 5: contributions to the understanding and exploration of porphyry deposits; by Plouffe, AORCID
logo (ed.); Schetselaar, EORCID logo (ed.); Geological Survey of Canada, Bulletin 616, 2021 p. 43-51, Open Access logo Open Access
PublisherNatural Resources Canada
Mediaon-line; digital
RelatedThis publication is contained in Targeted Geoscience Initiative 5: contributions to the understanding and exploration of porphyry deposits
File formatpdf
ProvinceBritish Columbia
NTS92I/09; 92I/10
Lat/Long WENS-120.5500 -120.4833 50.6833 50.6333
Subjectseconomic geology; geophysics; Science and Technology; Nature and Environment; mineral deposits; porphyry deposits; copper; gold; mineral exploration; mineralization; alteration; alteration halos; geophysical surveys; seismic surveys; seismic profiles; seismic waves; p waves; seismic velocities; acoustic surveys; boreholes; field methods; in-field instrumentation; geophysical logging; density logging; bedrock geology; structural features; faults; fractures; lithology; igneous rocks; intrusive rocks; picrites; diorites; monzonites; volcanic rocks; basalts; latites
Illustrationsgeoscientific sketch maps; cross-sections; location maps; geophysical profiles; plots; lithologic sections; profiles; geophysical logs
ProgramTargeted Geoscience Initiative (TGI-5) Intrusion/Porphyry ore systems - porphyry processes - mineral markers
Released2021 09 01; 2022 11 17
AbstractWe present a summary of physical rock properties and vertical seismic profiling (VSP) results acquired with distributed acoustic sensing (DAS) in boreholes that intersect the main mineralized zone and alteration halo at the New Afton Cu-Au porphyry deposit, British Columbia. We used an advanced DAS system that achieves signal-to-noise ratio of conventional geophones but offers high-density sensing of the entire fibre-optic cable. Straight and helically wound fibre-optic cables specifically engineered for the advanced DAS system were installed in two boreholes and compared with conventional fibre-optic cables with similar configurations connected to a standard DAS interrogator. Comparison of raw field data and processed data of both systems demonstrates a significantly higher signal-to-noise ratio for the new DAS system. Processed VSP data show several reflections with shallow dips that are mostly explained by faults and fractures observed in wireline logs and intersecting the surveyed boreholes.
Summary(Plain Language Summary, not published)
This Bulletin published by the Geological Survey of Canada contains ten articles summarizing the results of five-year research projects conducted on porphyry deposits in Canada as part of the Targeted Geoscience Initiative (TGI). Porphyry deposits are ore bodies, including past-producing and active mines, associated with intrusive rocks such as granite. They are significant producers of a variety of metals, including copper, molybdenum, tin and tungsten. Nine out of ten papers describe projects conducted in the Canadian Cordillera where most Canadian porphyry deposits occur and a paper on similar, but older deposits in the Appalachians of Atlantic Canada. The main objective of these TGI research projects was to better define the geological conditions where porphyry deposits form and test techniques to detect buried porphyry deposits in support of mineral exploration.

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