Airborne Gamma-Ray Spectrometric and Magnetic Surveys over the Bonaparte Lake Area, BC (NTS 92P, 93A)
- Warner Miles, Mike Thomas, Natural Resources Canada

Bonaparte Survey Airborne gamma-ray spectrometric and magnetic geophysical surveying was completed over the Bonaparte Lake area, BC, in the eastern half of NTS 92 P in the fall of 2006. The aim of the survey was to encourage new private sector investment in resource exploration, to aid in the assessment and development of targets for mineral exploration, and to support future bedrock and surficial geological mapping.

The Bonaparte Lake area in south-central British Columbia is prospective for a number of mineral deposit types, particularly copper porphyries. However, an extensive Quaternary cover, Tertiary volcanic cover and a lack of public domain geophysical data have limited exploration in the region.

Airborne gamma-ray spectrometry provides a physical measurement which contributes to geochemical mapping of the top 30 cm of the earth's surface. The technique provides bedrock and overburden mapping assistance by fingerprinting the radioactive element signatures inherent in all rocks and soils. Where the normal signatures are disrupted by mineralizing processes, anomalies provide direct exploration vectors.

Aeromagnetic surveys provide structural and lithological information from rocks located at surface down to considerable depths. In the proposed surveys area, the technique allows determination of magnetic source depths, key to understanding lithology and mineral potential under the extensive cover sequences.

When these two techniques are integrated into a single-pass airborne survey, they provide complimentary information that serves as a long-standing geophysical/geochemical framework, supporting new geological and practical mineral exploration models for a wide variety of commodities. For example, similar surveys conducted recently in areas adjacent to the Bonaparte Lake Survey have improved geological understanding and exploration for porphyry Cu-Au, skarn, and other deposit types.

Posters and Presentations
2007: New Airborne Geophysics in British Columbia
- Mineral Exploration Roundup Poster (pdf, 2.05MB)

2007: NEW Airborne Gamma-Ray Spectrometric and Magnetic Surveys in the Bonaparte Lake area (NTS 92 P): New Models, Targets, Discoveries! - April 2nd
- Kamloops Exploration Group Conference Poster (pdf, 60.2MB)

2007: NEW Airborne Gamma-Ray Spectrometric and Magnetic Surveys in the Bonaparte Lake area (NTS 92 P): New Models, Targets, Discoveries! - April 3rd
- Kamloops Exploration Group Conference Poster (pdf, 31.5MB)

2007: NEW Airborne Gamma-Ray Spectrometric and Magnetic Surveys in the Bonaparte Lake area (NTS 92 P): New Models, Targets, Discoveries! - April 4th
- Kamloops Exploration Group Conference Poster (pdf, 30.2MB)

Technical Articles
2011: "Geological significance of high-resolution magnetic data in the Quesnel terrane, Central British Columbia"
- Canadian Journal of Earth Sciences, Volume 48(6) p.1065-1089

2007: "Airborne Gamma-Ray Spectrometric and Magnetic Surveys over the Bonaparte Lake Area (NTS 092P), South-Central British Columbia"
- Geological Fieldwork 2006, Paper 2007-1 p.375-376 (pdf, 208KB)

Final Deliverables
Geoscience BC Maps 2007-3-1 through 9 and 2007-4-1 through 8
(alternate number: GSC Open Files 5488 - 5504)

A high-resolution aeromagnetic and airborne gamma-ray spectrometric geophysical survey in the Bonaparte Lake area (parts of NTS 92P and 093A) was completed in 2006. Funding for the survey was provided by Geoscience BC, Natural Resources Canada's Targeted Geoscience Initiative (TGI3), Candorado Operating Company Ltd., GWR Resources Inc. and Amarc Resources Ltd. Project management was undertaken by the Geological Survey of Canada. The western portion of the survey area was surveyed with a fixed-wing by Sander Geophysics Ltd., while the eastern portion was surveyed with a helicopter by Fugro Airborne Surveys. This map, in UTM Zone 10 projection, features 2 magnetic parameters, residual total magnetic field and first vertical derivative of the magnetic field, and multisensor gamma ray spectrometric geophysical data.



 


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