| Title | Wireline logging and distributed acoustic sensing VSP to characterize host rocks and alteration of porphyry deposits: preliminary results from the New Afton mine |
| Download | Download (whole publication) |
| Author | Bellefleur, G; Schetselaar, E M; Wade, D; White, D |
| Source | Targeted Geoscience Initiative: 2017 report of activities, volume 1; by Rogers, N (ed.); Geological Survey of Canada, Open File 8358, 2018 p. 9-14, https://doi.org/10.4095/306396 (Open Access) |
| Year | 2018 |
| Publisher | Natural Resources Canada |
| Document | open file |
| Lang. | English |
| Media | on-line; digital |
| Related | This publication is contained in Rogers, N; (2018). Targeted
Geoscience Initiative: 2017 report of activities, volume 1, Geological Survey of Canada, Open File 8358 |
| File format | pdf |
| Province | British Columbia |
| NTS | 92I/09; 92I/10 |
| Area | Kamloops |
| Lat/Long WENS | -121.0000 -120.0000 50.7500 50.5000 |
| Subjects | economic 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; ore systems approach; Phanerozoic; Cenozoic; Tertiary; Mesozoic; Jurassic; Triassic |
| Illustrations | geoscientific sketch maps; lithologic sections; geophysical logs; graphs; seismic profiles |
| Program | Targeted
Geoscience Initiative (TGI-5), Knowledge Management Coordination |
| Program | Targeted
Geoscience Initiative (TGI-5), Porphyry systems |
| Released | 2018 01 19 |
| Abstract | Wireline 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. |
| GEOSCAN ID | 306396 |
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