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TitleWireline logging and distributed acoustic sensing VSP to characterize host rocks and alteration of porphyry deposits: preliminary results from the New Afton mine
DownloadDownload (whole publication)
LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorBellefleur, GORCID logo; Schetselaar, E MORCID logo; Wade, D; White, DORCID logo
SourceTargeted Geoscience Initiative: 2017 report of activities, volume 1; by Rogers, N (ed.); Geological Survey of Canada, Open File 8358, 2018 p. 9-14, Open Access logo Open Access
PublisherNatural Resources Canada
Documentopen file
Mediaon-line; digital
RelatedThis publication is contained in Targeted Geoscience Initiative: 2017 report of activities, volume 1
File formatpdf
ProvinceBritish Columbia
NTS92I/09; 92I/10
Lat/Long WENS-121.0000 -120.0000 50.7500 50.5000
Subjectseconomic geology; structural geology; geophysics; mineral deposits; mineral exploration; mineral potential; porphyry deposits; metals; copper; gold; ore mineral genesis; ore controls; structural controls; geophysical logging; geophysical surveys; acoustic surveys; seismic surveys; seismic profiles; host rocks; alteration; hydrothermal systems; magmatism; concentration; modelling; bedrock geology; lithology; igneous rocks; intrusive rocks; diorites; monzonites; volcanic rocks; picrites; basalts; sedimentary rocks; structural features; faults; hypogene deposits; Canadian Cordillera; New Afton Mine; Ashcroft Formation; Kamloops Group; Nicola Formation; Cherry Creek monzonite; Iron Mask batholith; Phanerozoic; Cenozoic; Tertiary; Mesozoic; Jurassic; Triassic
Illustrationsgeoscientific sketch maps; lithologic sections; geophysical logs; graphs; seismic profiles
ProgramTargeted Geoscience Initiative (TGI-5) Knowledge Management Coordination
ProgramTargeted Geoscience Initiative (TGI-5) Porphyry systems
Released2018 01 19
AbstractWireline logs and vertical seismic profile (VSP) data were acquired in two boreholes intersecting the Cu-Au New Afton porphyry deposit located near Kamloops, British Columbia. The wireline logs and VSP data are components of an integrated geophysical imaging and 3D geological modelling study that aims to improve knowledge of the role of magmatic hydrothermal processes and structural controls in concentrating metals in porphyry deposits. Log data provide physical rock properties for the propylitic, phyllic, and potassic alteration zones. Both propylitic and phyllic zones are characterized by a broad distribution of density and P-wave velocities whereas the feldspar-dominant potassic alteration zone has generally high velocities. The VSP survey was conducted with a distributed acoustic sensing (DAS) system that utilized fibre-optic cables cemented in two boreholes at the New Afton mine. Fibre-optic cables comprised standard and ConstellationTM fibres in both straight and helically-wound configurations for comparison purposes. Seismic sources consisted of fifty shot points each loaded with one kilogram of pentolite explosive placed in a 20 m deep shot hole. VSP data from both types of fibre show clear down going waves and reflections although signal-to-noise ratio is significantly higher on the ConstellationTM fibre-optic cable. A preliminary analysis of VSP data from one shot point shows reflections possibly associated with the potassic zone and the picrite unit located just below the bottom of the borehole.
Summary(Plain Language Summary, not published)
The Targeted Geoscience Initiative (TGI) is directed towards providing next generation knowledge and methods to facilitate more effective targeting of buried mineral deposits. The program aims to enhance the effectiveness of exploration for Canada¿s major mineral systems by resolving foundational geoscience problems that constrain the geological processes responsible for the liberation metals from their source region, transportation of these ore metals and control their eventual deposition. TGI supports projects on gold, Ni-Cr-PGE, porphyry-style mineralization, uranium and volcanic- and sedimentary-hosted base metal mineralization ore systems, with each project divided into subprojects focused on resolving specific knowledge gaps by integrating data and studies from multiple sites across Canada. Herein, we present interim results and interpretations from a selection of the research activities currently being conducted under the auspices of TGI.

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