| Title | Seismic 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 |
| Download | Downloads |
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| Licence | Please note the adoption of the Open Government Licence - Canada
supersedes any previous licences. |
| Author | Bellefleur, G ;
Schetselaar, E; White, D |
| Source | Targeted Geoscience Initiative 5: contributions to the understanding and exploration of porphyry deposits; by Plouffe, A (ed.); Schetselaar, E (ed.); Geological Survey of Canada, Bulletin 616, 2021 p. 43-51, https://doi.org/10.4095/327942  Open Access |
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| Year | 2021 |
| Publisher | Natural Resources Canada |
| Document | serial |
| Lang. | English |
| Media | on-line; digital |
| Related | This publication is contained in Targeted Geoscience
Initiative 5: contributions to the understanding and exploration of porphyry deposits |
| File format | pdf |
| Province | British Columbia |
| NTS | 92I/09; 92I/10 |
| Area | Kamloops |
| Lat/Long WENS | -120.5500 -120.4833 50.6833 50.6333 |
| Subjects | economic 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 |
| Illustrations | geoscientific sketch maps; cross-sections; location maps; geophysical profiles; plots; lithologic sections; profiles; geophysical logs |
| Program | Targeted Geoscience Initiative (TGI-5) Intrusion/Porphyry ore systems - porphyry processes - mineral markers |
| Released | 2021 09 01; 2022 11 17 |
| Abstract | We 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. |
| GEOSCAN ID | 327942 |
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