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TitleThree-dimensional analysis of magnetotelluric data from the New Afton porphyry deposit, central British Columbia
LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorRoots, E; Craven, J A; Schetselaar, E; Enkin, RORCID logo; Wade, D
SourceTargeted Geoscience Initiative 5: contributions to the understanding and exploration of porphyry deposits; by Plouffe, AORCID
logo (ed.); Schetselaar, E (ed.); Geological Survey of Canada, Bulletin 616, 2021 p. 53-64, 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 50.7000 50.6167
Subjectseconomic geology; geophysics; structural geology; Science and Technology; Nature and Environment; mineral deposits; porphyry deposits; copper; gold; mineral exploration; ore mineral genesis; mineralization; alteration; alteration halos; mapping techniques; geophysical surveys; magnetotelluric surveys; core samples; conductivity; resistivity; porosity; trend surface analyses; ore controls; structural controls; field methods; in-field instrumentation; bedrock geology; structural features; faults; lithology; igneous rocks; intrusive rocks; picrites; diorites; monzonites; volcanic rocks; basalts; latites; sedimentary rocks; sandstones; software; modelling; New Afton Deposit; Pothook Deposit; Nicola Group; Kamloops Group; Phanerozoic; Mesozoic; Triassic
Illustrationslocation maps; geoscientific sketch maps; plots; 3-D models; 3-D images
ProgramTargeted Geoscience Initiative (TGI-5) Intrusion/Porphyry ore systems - porphyry processes - mineral markers
Released2021 09 01; 2022 11 17
AbstractMagnetotelluric data were collected along eight lines perpendicular to the mineralized zone and alteration halo of the New Afton Cu-Au porphyry deposit. The data were collected at an interstation spacing of 100 m and a line spacing of 300 m, and with a bandwidth of approximately 0.01 to 10 000 Hz. Phase tensor maps show an approximately east-west delineation of the survey into northern and southern sections. Determinant phase maps show conductivities initially increasing with depth in the north and decreasing in the south, with this trend reversing at depth. Preliminary results from 3-D inversions show conductive cover underlain by more resistive material throughout most of the survey area, with notably lower resistivities to the north. Two linear northeast-southwest features, spatially associated with the New Afton and Pothook mineralization, are imaged crosscutting the primary east-west fault zone, with high resistivities in the north and low resistivities in the south.
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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